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Broomrape
Naked broomrape (Orobanche uniflora)
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Lamiales
Family: Orobanchaceae
Tribe: Orobancheae
Genus: Orobanche
L.
Synonyms[1]
List
  • Aphyllon Mitch.
  • Boulardia F.W.Schultz
  • Catodiacrum Dulac
  • Ceratocalyx Coss.
  • Chorobanche C.Presl
  • Gymnocaulis Nutt.
  • Kopsia Dumort.
  • Loxanthes Raf.
  • Myzorrhiza Phil.
  • Necranthus Gilli
  • Orobanchella Piwow., M.Nobis & Madeja
  • Phelipanche Pomel
  • Platypholis Maxim.
  • Thalesia Raf. ex Britton

Orobanche, commonly known as broomrape, is a genus of almost 200 species of small parasitic herbaceous plants, mostly native to the temperate Northern Hemisphere.[2] It is the type genus of the broomrape family Orobanchaceae. It is a weed on broadleaf crop plants in Australia, where some states enforce mandatory destruction and reporting, as well as prohibition of sale.[3][4]

Description

[edit]

Broomrapes are generally small, only 10–60 centimetres (4–24 inches) tall depending on species. They are best recognized by the yellow- to straw-coloured stems completely lacking chlorophyll, bearing yellow, white, or blue snapdragon-like flowers. The flower shoots are scaly, with a dense terminal spike of 10-20 flowers in most species, although single in one-flowered broomrape (Orobanche uniflora). The leaves are merely triangular scales. The seeds are minute, tan or brown, blackening with age. These plants generally flower from late winter to late spring. When they are not flowering, no part of the plants is visible above the surface of the soil.

Parasitism

[edit]

As they have no chlorophyll, the broomrapes are totally dependent on other plants for nutrients. Broomrape seeds remain dormant in the soil, often for many years, until stimulated to germinate by certain compounds produced by living plant roots.[5] Broomrape seedlings put out a root-like growth, which attaches to the roots of nearby hosts. Once attached to a host, the broomrape robs its host of water and nutrients.

Some species are only able to parasitise a single plant species, and they are often named after the plant they parasitise, such as ivy broomrape (O. hederae) being restricted to parasitising ivy. Others can infect several genera, such as the lesser broomrape O. minor, which lives on clover and other related Fabaceae.

Branched broomrape Orobanche ramosa, native to central and southwestern Europe but widely naturalised elsewhere, is considered a major threat to crops in some areas. Plants that it targets are tomato, eggplant, potato, cabbage, coleus, bell pepper, sunflower, celery, and beans. In heavily infested areas, branched broomrape can cause total crop failure.

The bean broomrape Orobanche crenata, which targets the fava bean, has stems that are gathered and eaten in the Italian region of Apulia.[6]

Etymology

[edit]

The generic name Orobanche comes from the Greek ὀροβάγχη (orobánkhē), from ὄροβος (órobos "bitter vetch") + ἄγχω (ánkhō (I) "strangle").[7][8] The common name "broomrape" comes from the English "broom" (a plant) + Latin rapum ('tuber').[9]

Species

[edit]

The following species are recognised in the genus Orobanche:[1]

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Orobanche

View on Grokipedia
from Grokipedia
Orobanche is a of approximately 200 of holoparasitic herbaceous in the family , characterized by their complete lack of and dependence on host for nutrients. These , biennial, or feature leafless, fleshy stems that emerge from the soil, bearing tubular or campanulate flowers in shades of purple, yellow, or white, and they attach to host roots via specialized haustoria to extract water and nutrients. Commonly known as broomrapes, the name derives from the Greek words orobos (a type of vetch) and anchein (to strangle), reflecting their parasitic habit, originally observed on vetch (a type of ). Taxonomically, Orobanche belongs to the order within the class Magnoliopsida, encompassing a diverse group historically including segregate genera such as Aphyllon and Phelipanche, though some Old World species are now classified in the segregate genus Phelipanche; recent phylogenetic studies recognize Orobanche sensu lato as comprising distinct Old World and New World clades. The genus exhibits cryptic diversity, particularly in the , where host-specificity drives speciation, with many species parasitizing members of the family. Morphologically, are glandular and often hairy, with scale-like bracts subtending the ; their seeds are minute, dust-like, and capable of long-term in soil. Ecologically, Orobanche species are obligate root parasites distributed primarily across temperate regions of , , and the , with centers of diversity in the Mediterranean Basin and western , the latter ranging from to central . Their life cycle involves triggered by host root exudates, followed by haustorial formation and nutrient siphoning, which can severely impact crop yields in agricultural settings, making certain species like O. minor and O. ramosa significant pests. While some species are narrowly endemic and face conservation threats from habitat loss, others demonstrate adaptability across diverse hosts, including both wild and cultivated plants.

Taxonomy and Classification

Etymology

The genus name Orobanche derives from the words orobos, meaning "bitter vetch" (a type of ), and anchein, meaning "to strangle" or "to choke," alluding to the plant's parasitic habit of attaching to and harming vetch-like hosts. This etymology reflects the observed impact of the parasite on its legume hosts, as noted in early botanical observations. The genus was formally established by in his in 1753, where he described several species under this name, drawing on classical Greek references to similar choking plants. The common name "broomrape" originates from the plant's frequent parasitism on broom shrubs (Cytisus species) and the Latin rapum (or rapa), meaning "tuber" or "turnip," referring to the tuber-like haustoria that form on the host roots. This name evolved from Rapum genistae, literally "broom tuber," and entered English botanical literature in the 16th century to describe the swollen, root-like structures of these parasites.

Phylogenetic Position and Subdivisions

Orobanche is the of the family , which is classified within the order in the clade of flowering plants. The family includes around 100 genera and more than 2,000 species, the majority of which exhibit parasitic lifestyles ranging from hemiparasitism to holoparasitism. Within this family, Orobanche sensu lato encompasses approximately 170–200 species, depending on taxonomic treatment, all obligate holoparasites that lack and depend entirely on host plants for nutrients. Phylogenetic studies position Orobanche as a monophyletic holoparasitic basal to the other parasitic lineages in , suggesting that the transition to full occurred early in the family's evolution. Recent phylogenetic studies recognize distinct and clades within Orobanche sensu lato, with New World species often placed in segregate genera such as Aphyllon. This distinction is evident from molecular analyses using genes such as rbcL and matK, which demonstrate Orobanche's divergence from hemiparasitic relatives like in the same family, with estimates placing this split around 30–40 million years ago during the . These findings underscore Orobanche's evolutionary specialization toward complete host dependency, contrasting with the photosynthetic capabilities retained in hemiparasites. Traditionally, Orobanche has been subdivided into sections such as Sect. Orobanche, Sect. Trionychon, Sect. Gymnocaulis, and Sect. Myzorrhiza, primarily based on morphological traits like corolla morphology and seed coat sculpturing, corroborated by genetic data. Modern taxonomy has undergone significant revisions, with molecular phylogenies prompting the recognition of segregate genera; for instance, many species previously in Orobanche have been transferred to Phelipanche, reflecting distinct evolutionary lineages supported by differences in pollen ultrastructure and DNA sequences. Similarly, genera like Cistanche, which includes holoparasitic species adapted to arid environments, have been delimited separately within Orobanchaceae based on comprehensive phylogenetic evidence.

Description and Morphology

Vegetative Structures

Orobanche species are annual, biennial, or perennial herbaceous holoparasites that completely lack , resulting in yellowish-white to straw-colored, fleshy stems typically 10-60 cm tall. These erect stems emerge from underground attachments to host and exhibit no photosynthetic capability, relying entirely on the host for sustenance. The leaves are vestigial, reduced to small triangular scales or bracts along the stem, measuring 3-10 mm long, which serve no photosynthetic function and often bear hairs, being broadest at the base and tapering upward. This reduction reflects their to a fully parasitic , minimizing non-essential structures. Belowground, Orobanche forms a —a swollen, tuber-like structure—from which short, stubby, non-functional may emerge, but nutrient and water uptake occurs primarily via haustoria. These specialized organs, arising from the or , attach to host through enzymatic and mechanical penetration, establishing direct vascular connections for .

Floral and Reproductive Features

The of Orobanche emerges as an erect, spike-like from the host plant, typically bearing 10–20 tubular, zygomorphic flowers, though some can produce up to 50 flowers in denser clusters. These flowers, often resembling those of snapdragons in form, exhibit colors ranging from white and yellowish to purple or reddish-violet, with bracts subtending each flower and contributing to the 's compact appearance. Flowering timing is generally synchronized with the phenological stage of the host plant to optimize resource availability. The flower structure features a gamosepalous calyx with 4–5 lobes, often glandular-hairy and tubular in shape, enclosing the base of the corolla. The corolla is sympetalous and distinctly bilabiate, with a hooded upper and a three-lobed lower forming an open throat; it measures 1–2.5 cm in length and includes nectar guides and venation patterns that attract pollinators. Four didynamous stamens, inserted on the corolla tube and bearing non-glandular trichomes on their filaments, surround a superior, bicarpellate that develops into the fruit. Pollination in Orobanche is primarily entomophilous, facilitated by such as bees, bumblebees, flies, and wasps that are drawn to the flowers' fragrance and secreted from annular nectaries at the base. guides and volatile compounds enhance attraction, though isolated populations may exhibit partial to ensure reproduction. The fruit is a dehiscent, loculicidal capsule containing thousands of minute seeds (0.2–0.3 mm), which are released upon maturation and drying of the . occurs primarily via wind and water, with additional facilitation by human activities and animals, allowing seeds to accumulate in seed banks where they retain viability for 10–20 years or longer under suitable conditions.

Ecology and Life History

Distribution and Habitat Preferences

Orobanche species are primarily native to temperate regions across the , encompassing , , , and , with the highest diversity concentrated in the Mediterranean Basin and western Asia. Several species have been introduced to non-native areas, including —particularly the wheat belts where they exhibit invasive behavior—and parts of , as well as additional regions in and beyond. Their global range reflects adaptation to regions where suitable host plants occur, though specific host interactions vary. These plants thrive in disturbed soils within diverse habitats such as grasslands, xerothermic steppes, rocky slopes, coastal dunes, woodlands, and agricultural fields, often favoring well-drained, substrates. They exhibit a preference for neutral to alkaline soils with levels typically ranging from 6 to 8, where acidic conditions are less common due to inhibited seed germination. Altitudinally, Orobanche species occur from to montane elevations (up to approximately 2,500 meters), with many documented in lowland to montane zones. Climatically, they are associated with Mediterranean and continental temperate zones, enduring seasonal during dry summers or cold winters, which aligns with their prevalence in warmest European regions and similar environments elsewhere.

Life Cycle Stages

Orobanche exhibit prolonged , remaining viable in the for 5 to 20 years under suitable conditions, which allows them to persist in the environment long after host plants have completed their cycles. This is physiological and requires a conditioning phase, typically involving exposure to and warm temperatures (15–25°C) for 5–14 days, to sensitize the seeds to germination stimulants and reduce inhibitory levels. Conditioning prepares the seeds for responsiveness without initiating growth, ensuring survival until a compatible host is present. Germination is triggered by specific root exudates from host plants, particularly strigolactones, which act as signaling molecules to induce the process in conditioned seeds. Upon stimulation, the emerges, elongating to 1–5 mm within hours to days, and directs growth toward the host via . The must contact the host within 2–3 days, or it desiccates; successful contact leads to formation, where intrusive cells penetrate the host cortex to establish vascular connections. Following attachment, the parasite develops an underground , a swollen structure that serves as a storage organ and develops adventitious and shoots over 2–4 months. This subterranean growth phase relies entirely on host resources, with the tubercle enlarging progressively until the flowering stem emerges aboveground, typically in late winter or spring depending on species and climate. Emergence timing is synchronized with the host's phenological stage to optimize . After stem emergence, rapid flowering and production occur, with capsules maturing to release thousands of tiny per plant. Senescence follows set, with the aerial parts withering within weeks, completing the annual life cycle in 4–8 months from to death. The entire process aligns closely with the host's growth cycle to ensure availability throughout.

Parasitism Mechanisms

Orobanche species are obligate holoparasites, completely lacking and thus unable to perform , which renders them entirely dependent on their host plants for , minerals, and organic compounds essential for growth and . This total reliance is facilitated through specialized haustoria, multicellular organs that form on the parasite's and establish intimate connections with the host's vascular tissues. Without a suitable host, Orobanche remain dormant in the for years, highlighting the critical role of host availability in their survival strategy. The infection process begins with chemical signaling from the host, where root exudates such as strigolactones stimulate seed near the host after a preconditioning period of moisture and moderate temperatures (typically 19–23°C for 4–12 days). Upon , the elongates toward the host, and at its apex, a differentiates, triggered by additional host-derived haustorium-inducing factors (HIFs) like quinones (e.g., 2,6-dimethoxybenzoquinone) and phenolics (e.g., ). Penetration occurs through intrusive growth of haustorial cells, aided by cell wall-modifying enzymes such as pectinases and polygalacturonases, which degrade the host's cortical tissues without causing cell , allowing the haustorium to reach and breach the host's vascular cylinder. This enzymatic and mechanical intrusion establishes direct contact with the host's and, in later stages, potentially the . Nutrient transfer primarily occurs via the connection initially, drawing water and minerals, while advanced haustorial development enables symplastic continuity with the host's sieve elements for uptake of photosynthates like and . This resource diversion leads to significant host impacts, including , reduced , and hormonal imbalances that prioritize parasite development over host . Yield losses in affected herbaceous hosts can reach 50–100%, depending on parasite density and infection timing. Host specificity in Orobanche varies widely across species, influenced by differential responses to host root exudates and HIFs. For instance, O. ramosa (now often classified as Phelipanche ramosa) exhibits a broad host range, parasitizing multiple families including Solanaceae (e.g., tomato and tobacco), Brassicaceae, and Apiaceae. In contrast, O. hederae shows narrow specificity, primarily attaching to ivy (Hedera spp.), a woody host that typically survives infection without fatality, unlike the often lethal effects on herbaceous plants. This variation underscores the evolutionary adaptations in recognition mechanisms that determine successful parasitism.

Species Diversity

Overview of Species Count and Variation

The genus Orobanche encompasses approximately 150–200 accepted of holoparasitic , though ongoing taxonomic revisions continue to refine this estimate based on morphological and molecular data. This variation in counts arises from challenges in delimiting species boundaries, particularly among closely related taxa that exhibit subtle differences in structure and host associations. The genus exhibits its highest diversity in the Mediterranean Basin, with over 100 documented there, underscoring the region's ecological and evolutionary significance as a hotspot for diversification. Infrageneric classification traditionally divides Orobanche into four main sections, with some systems recognizing up to seven when including subsections, primarily delineated by corolla morphology (e.g., tubular versus inflated forms), seed size and ornamentation, and host preferences ranging from specific herbaceous to broader dicotyledonous hosts. For instance, Section Orobanche features species with unbranched, erect stems and campanulate corollas, adapting to nutrient-poor soils via specialized haustorial attachments. These morphological patterns correlate with ecological niches, such as arid steppes or coastal dunes, facilitating within the genus. Molecular analyses, including sequences from the nuclear (ITS) regions and chloroplast DNA (e.g., trnL-F and rpl32-trnL), highlight substantial genetic diversity across Orobanche, with evidence of hybridization events and contributing to in select lineages. , often tetraploid or higher, is restricted to a minority of taxa, such as those in Section Gymnocaulis, where it enhances tolerance to environmental stressors but complicates phylogenetic resolution due to reticulate evolution. Such genetic mechanisms underscore the genus's potential for rapid amid changing climates and host availability. Conservation concerns affect multiple Orobanche species, several of which are rare or endangered owing to from and , particularly in fragmented Mediterranean ecosystems. For example, Orobanche reticulata subsp. pallidiflora is classified as Near Threatened on regional Red Lists and protected in parts of due to its dependence on specific hosts in declining grasslands. These status assessments emphasize the need for targeted monitoring to preserve in this genus.

Key Species and Their Characteristics

Orobanche minor, commonly known as small broomrape or common broomrape, is characterized by its slender, unbranched stems reaching up to 70 cm in height and small, pale yellow to white flowers arranged in a compact spike. This holoparasitic species primarily infects roots of leguminous plants such as , , and vetch, forming attachments that induce swelling in host roots. Native to and , it has become a widespread weed in agricultural fields across and was introduced to , where it poses challenges to legume crops. Orobanche ramosa, or branched broomrape, features highly branched, erect stems up to 50 cm tall with numerous small, tubular flowers that are typically violet-tinged. It parasitizes a broad range of hosts, particularly in the family including , , and , as well as some and species. This species is prevalent in Mediterranean regions, extending to parts of , , and introduced areas like , where it severely impacts production. Orobanche crenata, known as crenate or bean broomrape, is distinguished by its robust stems up to 80 cm tall bearing larger, whitish to pale yellow flowers with crenate (notched) corolla lobes. It mainly targets crops such as faba bean and , as well as some , leading to significant yield losses in infested fields. Distributed across the Mediterranean Basin, , and parts of the , young shoots of this species are consumed as a in certain cultures, such as in parts of and the Mediterranean, where they are fried or used in local dishes. Orobanche uniflora, or oneflower broomrape, exhibits a simple, unbranched scape typically 5-20 cm tall supporting a single nodding, purplish flower, making it one of the most diminutive in the . As a native North American , it parasitizes a variety of herbaceous hosts including goldenrods ( spp.) and other , though it is generally less aggressive and does not pose major threats to . Its distribution spans much of the and , often in open woodlands and prairies. Orobanche hederae, ivy broomrape, produces short, unbranched stems around 10-30 cm high with small, yellowish-white flowers clustered in a lax . Highly host-specific, it exclusively parasitizes ivy ( and related species) in the family, attaching to roots without significant impact on agricultural systems. This species is primarily found in Western and , , and Asia Minor, thriving in shaded, temperate habitats associated with its host.

Human Relevance

Agricultural and Economic Impacts

Orobanche species, commonly known as broomrapes, pose significant threats to by parasitizing the of major crops, leading to substantial yield reductions and economic losses worldwide. They primarily affect such as peas, beans, and faba beans; crops including tomatoes and peppers; and others like sunflower, with global annual losses estimated at $1.3–2.6 billion as of 2018. These parasites extract , nutrients, and carbohydrates from host , causing , reduced , and yield declines ranging from 20% to 100% in heavily infested fields. Infested plants also exhibit increased vulnerability to secondary stresses, such as and pathogens, exacerbating damage through impaired root function and weakened defenses. In the , particularly in regions like and the Valley, Orobanche infestations have caused yield losses of up to 80% in faba beans and tomatoes, forcing shifts in cropping patterns and reducing farmer incomes. Similarly, in , especially Mediterranean countries like and , broomrapes impact sunflower and legume production, with losses reaching 50–100% in severe cases and contributing to broader challenges in drier climates. These impacts not only diminish direct harvests but also increase production costs through periods and altered farming practices. Despite their detrimental effects, certain Orobanche species offer limited positive uses in human contexts. For instance, young shoots of O. crenata are harvested in some Mediterranean traditional diets as a or , valued for their taste since Roman times and consumed in faba fields. Additionally, alkaloids extracted from Orobanche species show potential pharmaceutical applications, including treatments for tonification, impotence, dermatological conditions, and effects, though further research is needed for clinical development. The invasive potential of Orobanche has led to strict quarantine measures in countries like and the , where species such as O. ramosa are classified as prohibited weeds or high-risk pests. In the U.S., particularly , even low-level detections trigger field quarantines, crop destruction, and monitoring programs, imposing significant economic costs on growers—often exceeding potential yield losses from infestation alone—due to lost harvests and regulatory compliance. These efforts highlight the broader economic burden of preventing establishment in non-native regions.

Management and Control Strategies

Cultural practices form the foundation of Orobanche management, emphasizing disruption of the parasite's life cycle through agronomic adjustments. Crop rotation with non-host plants, such as cereals like or , is a primary strategy that reduces host availability and depletes the persistent over 5–9 years, achieving moderate efficacy in limiting infestations. Delayed planting or transplanting desynchronizes the host crop's growth with Orobanche germination cues, thereby decreasing attachment rates; for instance, a three-week delay in faba bean sowing can significantly lower levels. Soil solarization, involving the covering of moist soil with transparent sheets during summer to raise temperatures to 48–57°C for 4–8 weeks, effectively kills up to 99% of Orobanche seeds in the upper soil layers, though its high implementation cost limits widespread adoption. Chemical control targets Orobanche at pre- and post-attachment stages, often applied systemically through the host to minimize non-target effects. Herbicides such as glyphosate (60–120 g/ha) or sulfonylureas like sulfosulfuron (37.5–75 g/ha) are effective when foliar-applied or herbigated to tolerant crops, reducing emerged shoots and underground attachments by inhibiting growth in germinated seeds and young tubers. Seed treatments with conditioning agents, including synthetic strigolactone analogs like GR7 or GR24, induce suicidal germination by stimulating seed coat rupture without a suitable host, thereby exhausting the seed bank over multiple seasons. Imidazolinone herbicides, such as imazapic, applied via seed coating or low-dose foliar sprays, provide selective control in legumes by translocating to parasite attachments, though efficacy varies with application timing and soil conditions. Biological approaches leverage natural antagonists and host modifications to suppress Orobanche populations sustainably. Trap crops, such as or , stimulate massive but prevent successful , reducing infestations by 30–95% when rotated with hosts like . Mycoherbicides based on or Ulocladium botrytis target and radicles, achieving up to 80% biomass reduction in field trials, though inconsistent performance under varying environmental conditions has hindered commercialization. Breeding resistant varieties for , such as faba lines screened from diverse , incorporates mechanisms like low exudation or post-attachment , with select genotypes exhibiting high to moderate resistance to Orobanche crenata. Insects like Phytomyza orobanchia also show promise by mining stems and reducing production by 29–94%, but their natural distribution limits broad application. Integrated pest management (IPM) combines these methods with monitoring and regulatory measures for long-term suppression, addressing Orobanche's protracted seed viability (up to 20 years). Regular soil sampling and modeling guide intervention timing, while strict enforcement—such as machinery cleaning and certified use—prevents spread. Recent post-2020 advances in host-induced (HIGS) via target parasite genes like EXPA6 or KAI2/HTL, achieving over 90% transcript reduction and 30% fewer tubercles in crops such as sunflower and through transgenic expression of double-stranded RNAs. Spray-induced (SIGS) represents an emerging non-GM approach with potential low-dose dsRNA sprays (~1 g/ha) for enhancing resistance to Orobanche without genetic modification, though specific efficacy requires further research as of 2025. Overall, IPM integrating resistant cultivars, trap crops, targeted herbicides, and biological agents—exemplified by combinations yielding no emergence in faba bean fields—offers the most effective, environmentally sound control. As of 2025, ongoing research into tools and advanced technologies continues to support innovative management strategies.

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