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Functional Androdioecy in Critically Endangered Gymnocladus assamicus (Leguminosae) in the Eastern Himalayan Region of Northeast India

Title:

Functional Androdioecy in Critically Endangered Gymnocladus assamicus (Leguminosae) in the Eastern Himalayan Region of Northeast India

Choudhury, Baharul Islam, Khan, M.L. and Dayanandan, Selvadurai (2014) Functional Androdioecy in Critically Endangered Gymnocladus assamicus (Leguminosae) in the Eastern Himalayan Region of Northeast India. PLoS ONE, 9 (2). pp. 1-8. ISSN 1932-6203

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Official URL: http://dx.doi.org/10.1371/journal.pone.0087287

Abstract

Gymnocladus assamicus is a critically endangered tree species endemic to Northeast India, and shows sexual dimorphism with male and hermaphrodite flowers on separate trees. We studied phenology, reproductive biology and mating system of the species. The flowers are small, tubular, odorless and last for about 96 hours. Pollen grains in both morphs were viable and capable of fertilization leading to fruit and seed set. Scanning electron micrographs revealed morphologically similar pollen in both male and hermaphrodite flowers. The fruit set in open pollinated flowers was 43.61 percent, while controlled autogamous and geitonogamous pollinations yielded 76.81 and 65.58 percent fruit set respectively. Xenogamous pollinations between male and hermaphrodite flowers resulted in 56.85 percent fruit set and pollinations between hermaphrodite flowers yielded 67.90 percent fruit set. This indicates a functionally androdioecious mating system and pollination limited fruit set in G. assamicus. Phylogenetic analyses of Gymnocladus and the sister genus Gleditsia are needed to assess if the androdioecious mating system in G. assamicus evolved from dioecy as a result of selection for hermaphrodites for reproductive assurance during colonization of pollination limited high altitude ecosystems.

Divisions:Concordia University > Faculty of Arts and Science > Biology
Item Type:Article
Refereed:Yes
Authors:Choudhury, Baharul Islam and Khan, M.L. and Dayanandan, Selvadurai
Journal or Publication:PLoS ONE
Date:28 February 2014
Funders:
  • Concordia Open Access Author Fund
Digital Object Identifier (DOI):10.1371/journal.pone.0087287
ID Code:978302
Deposited By: BAHARUL CHOUDHURY
Deposited On:03 Mar 2014 15:23
Last Modified:18 Jan 2018 17:46
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