Catasetum fimbriatum

Fringed Catatsetum (Catasetum fimbriatum) is a member of the Orchid family of angiosperms and lives in a warm tropical environment. This plant uses a fascinating strategy to spread its pollen to other flowers via insects, primarily bees. When a pollinator lands on male flowers of C. fimbriatum and stimulates them, pollen is planted onto the back of the pollinator. This assures their gametes will be spread to other flowers the bee visits of the same species.[1]

Fringed Catasetum
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Monocots
Order:
Asparagales
Family:
Orchidaceae
Subfamily:
Epidendroideae
Tribe:
Cymbidieae
Subtribe:
Catasetinae
Genus:
Catasetum
Species:
C. fimbriatum
Binomial name
Catasetum fimbriatum
(C. Morren) Lindl. (1850)
Synonyms
  • Myanthus fimbriatus C. Morren (1848) (Basionym)
  • Catasetum fimbriatum var. fissum Rchb.f. (1881)
  • Catasetum fimbriatum var. viridulum Rchb.f. (1887)
  • Catasetum fimbriatum var. platypterum Rchb.f. (1889)
  • Catasetum cogniauxii L. Linden (1900)
  • Catasetum ornithorrhynchum Porsch (1905)
  • Catasetum fimbriatum var. aurantiacum Porsch (1908)
  • Catasetum fimbriatum var. brevipetalum Porsch (1908)
  • Catasetum fimbriatum var. micranthum Porsch (1908)
  • Catasetum pflanzii Schltr. (1912)
  • Catasetum inconstans Hoehne (1915)
  • Catasetum wredeanum Schltr. (1915)
  • Catasetum fimbriatum var. subtropicale Hauman (1917)
  • Catasetum fimbriatum var. inconstans (Hoehne) Mansf. (1932)
  • Catasetum fimbriatum var. morrenianum Mansf. (1932)
  • Catasetum fimbriatum var. ornithorrhynchum (Porsch) Mansf. (1932)

The mechanism behind how male C. fimbriatum ejects its pollen onto bees is still not well understood. However, kinetic studies have been done. When a bee lands on the flower this stimulates the antennae triggering a quick change in membrane potential. This propagates an action potential that results in an increase in turgor pressure. Immediately following an ejection of pollen onto the back of the bee and according to Simon et al.,[2] can sometimes knock the bee off the flower. Indeed, this was probably an evolved adaptation to prevent cross pollination [3]

Darwin's bee-trap experiment analyzed the kinetics and activation of this trigger mechanism of slapping pollen onto the back of bees. Frame by frame analysis was conducted with a V5.0 digital camera that captures images at 1,000 pictures per second.[3] The antennae of the orchid that set off the catapult of pollen was activated using a small wire. Many other experiments have shown evidence of electrical changes in membrane potential in plants such as the carnivorous Venus flytrap using ion-selective micro-electrodes [4] and the Mimosa plant using ion analysis in addition to X-ray fluorescence spectroscopy.[5] Future experiments utilizing these techniques could elucidate a more vivid picture of how this mechanism works on the molecular level.

References
  1. Braam, Janet (2004). "In Touch: Plant Responses to Mechanical Stimuli". New Phytologist. 165 (2): 373–389. doi:10.1111/j.1469-8137.2004.01263.x.
  2. Simons, Paul. "An Explosive Start for Plants: Plants Get up to Some Ingenious Tricks and Aerial Acrobatics to Ensure Their Survival". New Scientist.
  3. Nicholson, Charles C. (2008). "Darwin's Bee-Trap: The Kinetics of Catasetum, a New World Orchid". Plant Signaling & Behavior. 3: 19–23. doi:10.4161/psb.3.1.4980. PMC 2633950. PMID 19516977.
  4. Hedrich, Rainer (2018). "Venus Flytrap: How an Excitable, Carnivorous Plant Works". Trends in Plant Science. 23 (3): 220–234. doi:10.1016/j.tplants.2017.12.004. PMID 29336976.
  5. Allen, R. D. (1969). "Mechanism of the Seismonastic Reaction in Mimosa Pudica". Plant Physiology. 44: 1101–1107. doi:10.1104/pp.44.8.1101. PMC 396223. PMID 16657174.

"Catasetum fimbriatum" at the Encyclopedia of Life

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.