Orobanchaceae

Broomrape family
Striga bilabiata
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Lamiales
Family: Orobanchaceae
Vent.[1]

Orobanchaceae, the broomrapes, is a family of parasitic plants of the order Lamiales, with about 90 genera and more than 2000 species. Many of these genera were formerly included in the family Scrophulariaceae sensu lato. Together they are a monophyletic group, forming a distinct family.

The Orobanchaceae are annual herbs or perennial herbs or shrubs, and all (except Lindenbergia and Rehmannia) are parasitic on the roots of other plants—either holoparasitic or hemiparasitic (fully or partly parasitic). The holoparasitic species lack chlorophyll and therefore cannot perform photosynthesis.

Cistanche phelypaea
Cistanche tubulosa
Bellardia trixago

Distribution

The Orobanchaceae family has a cosmopolitan distribution, found mainly in temperate Eurasia, North America, South America, parts of Australia, New Zealand, and tropical Africa. The only exception to its distribution is Antarctica, though some genera may be found in subarctic regions.[2]

Taxonomy

Orobanchaceae is the largest of the 20-28 dicot families that express parasitism.[3] It consists of all types of plant parasitism: facultative parasite, obligate parasite, hemiparasites, and holoparasites.

Characteristics

Roots and Stems

Parasitic plants are attached to their host by means of haustoria, which transfer nutrients from the host to the parasite. Only the hemiparasitic species possess an additional extensive root system referred to as the lateral or side haustoria. In most holoparasitic species there is a swollen mass of short, bulky roots or one big swollen haustorial organ, which may be simple or composite, commonly called the terminal or primary haustoria.[4]

Plants are reduced to short vegetative stems, their alternate leaves are reduced to fleshy, tooth-like scales, and have multicellular hairs interspersed with glandular hairs.[5] The hemiparasitic species (transferred from Scrophulariaceae) are capable of photosynthesis, and may be either facultative or obligate parasites.

Flowers

The hermaphroditic flowers are bilaterally symmetrical and grow either in racemes or spikes or singly at the apex of the slender stem. The tubular calyx is formed by 2–5 united sepals. There are five united, bilabiate petals forming the corolla and they may be yellowish, brownish, purplish, or white. The upper lip is two-lobed, the lower lip is three-lobed. There are two long and two short stamens on slender filaments, inserted below the middle, or at the base of the corolla tube, alternating with the lobes of the tube. A fifth stamen is either sterile or lacking completely. The anthers dehisce via longitudinal slits. The pistil is one-celled. The ovary is superior. The flowers are pollinated by insects or birds (e.g. hummingbirds, as in Castilleja).

Fruits

The fruit is a dehiscent, non-fleshy, 1-locular capsule with many very minute endospermic seeds. Fruits of Orobanchaceae are small and abundant and can produce between 10,000-1,000,000 seeds per plant.[6] These are dispersed by the wind over long distances, which increases their chances of finding a new host.

Evolution

Development of the haustoria was a significant evolutionary event that allowed for the advancement of parasitic plants. The holoparasitic clade, Orobanche, delineates the first transition from hemiparasitism to holoparasitism within Orobanchaceae.

Despite the similar morphological traits found in both Scrophulariaceae and Orobanchaceae, the latter is now morphologically and molecularly considered monophyletic, though many of its genera were once considered a part of the Scrophulariaceae family.

Lindenbergia, once treated as a member of the Schrophulariaceae family, is the one of the only autotrophic genera within Orobanchaceae. It is believed to be the sister group to the hemiparasitic genera within its family.[7]

Ecology

This family has tremendous economic importance because of the damage to crops caused by some species in the genera Orobanche and Striga. They often parasitize cereal crops like sugarcane, maize, millet, sorghum, and other major agricultural crops like cowpea, sunflower, hemp, tomatoes, and legumes. Because of the ubiquitous nature of these particular parasites in developing countries, it is estimated to affect the livelihood of over 100 million people[8] killing 20 to 100 percent of crops depending on infestation.[9]

Some genera, especially Cistanche and Conopholis, are threatened by human activity, including habitat destruction and over-harvesting of both the plants and their hosts.

Research for this plant family can often be difficult due to its permit requirements for collection, travel, and research.

Genera

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References

  1. ↑ Angiosperm Phylogeny Group (2009). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III" (PDF). Botanical Journal of the Linnean Society 161 (2): 105–121. doi:10.1111/j.1095-8339.2009.00996.x. Retrieved 2013-07-06.
  2. ↑ Watson, David M. (October 13, 2009). "Parasitic plants as facilitators: more Dryad than Dracula?". Journal of Ecology 97 (6). doi:10.1111/j.1365-2745.2009.01576.x.
  3. ↑ editors, Daniel M. Joel, Jonathan Gressel, Lytton J. Musselman,; Kebab, E. (2013). Parasitic orobanchaceae parasitic mechanisms and control strategies. Berlin: Springer. ISBN 978-3-642-38146-1.
  4. ↑ Westwood, James H.; Yoder, John I.; Timko, Michael P.; dePamphilis, Claude W. (1 April 2010). "The evolution of parasitism in plants". Trends in Plant Science 15 (4): 227–235. doi:10.1016/j.tplants.2010.01.004. ISSN 1878-4372.
  5. ↑ Young, N.D.; Steiner, K.E.; Claude, W. (1999). "The Evolution of Parasitism in Schrophulariaceae/Orobanchaceae: Plastid gene sequences refute an evolutionary transition series". Annals of the Missouri Botanical Garden 86: 876–893.
  6. ↑ Molau, U. (1995). Parasitic Plants: Reproductive ecology and biology. London: Chapman and Hall. pp. 141–176.
  7. ↑ Judd, Walter S.; et al. (2008). Plant systematics : a phylogenetic approach (3rd ed.). Sunderland, Mass.: Sinauer Associates. ISBN 978-0-87893-407-2.
  8. ↑ Bromham, Lindell; Cowman, Peter F.; Lanfear, Robert (1 January 2013). "Parasitic plants have increased rates of molecular evolution across all three genomes". BMC Evolutionary Biology 13: 126. doi:10.1186/1471-2148-13-126. ISSN 1471-2148.
  9. ↑ Westwood, J.H.; et al. (2012). "The Parasitic Plant Genome Project: New tools for understanding the biology of Orobanche and Striga". Weed Science 60: 295–306.

External links

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