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First evidence of plants evolving weaponry to compete in the struggle for selection

Date:
March 20, 2014
Source:
Wiley
Summary:
Rutting stags and clawing bears are but two examples of male animals fighting over a mate, but new research has uncovered the first evidence of similar male struggles leading to the evolution of weaponry in plants.

This is an example of the horned pollinaria found in South American milkweed.
Credit: Andrea Cocucci

Rutting stags and clawing bears are but two examples of male animals fighting over a mate, but research in New Phytologist has uncovered the first evidence of similar male struggles leading to the evolution of weaponry in plants.

The team, led by Dr. Andrea Cocucci from the Instituto Multidisciplinario de Biologia Vegetal of Argentina, studied a species of milkweed (Apocynaceae), found in tropical climates. While plants do not mate like animals, but rather reproduce via pollinators such as insects or birds, competition between individuals to exploit those pollinators can result in confrontation between the plants.

Milkweed reproduce by hooking sacs of pollen grains, known as pollinia, to the bodies of birds and other pollinators, which can be unwittingly dropped into another flower to complete pollination.

It is possible for multiple pollinarium to become entangled together due to the limited number of attachment points on the pollinator, and this Dr. Cocucci's team believe, is the source of confrontation.

The team studied the South America milkweed genus Oxypetalum and found horn-like structures on the pollinia sacs which have no obvious biological use. The paper suggests that these horns are used to prevent the sacs from being hooked together with pollinia from other parent plants.

"Our results suggest that neither self-propulsion nor well-developed sensory perception are required for sexual selection to take place through intrasexual struggles," said Dr. Cocucci. "Apparently, only physical contact is enough to influence the mating success of competitors and to promote the evolution of defensive and attack weaponry."


Story Source:

The above story is based on materials provided by Wiley. Note: Materials may be edited for content and length.


Journal Reference:

  1. Andrea A. Cocucci, Salvador Marino, Matνas Baranzelli, Ana P. Wiemer, Alicia Sιrsic. The buck in the milkweed: evidence of male-male interference among pollinaria on pollinators. New Phytologist, 2014; DOI: 10.1111/nph.12766

Cite This Page:

Wiley. "First evidence of plants evolving weaponry to compete in the struggle for selection." ScienceDaily. ScienceDaily, 20 March 2014. <www.sciencedaily.com/releases/2014/03/140320101314.htm>.
Wiley. (2014, March 20). First evidence of plants evolving weaponry to compete in the struggle for selection. ScienceDaily. Retrieved July 23, 2014 from www.sciencedaily.com/releases/2014/03/140320101314.htm
Wiley. "First evidence of plants evolving weaponry to compete in the struggle for selection." ScienceDaily. www.sciencedaily.com/releases/2014/03/140320101314.htm (accessed July 23, 2014).

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