Genetic relatedness among developing seeds and intra fruit seed abortion in Dalbergia sissoo (Fabaceae)


Genetic relatedness among developing seeds and intra fruit seed abortion in Dalbergia sissoo (Fabaceae)

Mohana, G. S. and Shaanker, R. Uma and Ganeshaiah, K. N. and Dayanandan, Selvadurai (2001) Genetic relatedness among developing seeds and intra fruit seed abortion in Dalbergia sissoo (Fabaceae). American Journal of Botany, 88 (7). pp. 1181-1188. ISSN 0002-9122

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Dalbergia sissoo, a wind-dispersed tropical tree, exhibits high intrafruit seed abortion. Of the four to five ovules in the flower, generally one and occasionally two or three develop to maturity. It has been proposed that the seed abortion is a consequence of intense sibling competition for maternal resources and that this competition occurs as an inverse function of the genetic relatedness among the developing seeds. Accordingly, developing seeds compete intensely when they are genetically less related but tend to develop together when genetically more related. We tested this hypothesis by comparing the genetic similarity among the pairs of seeds developing within a pod with that among (a) random pairs from the pool of all seeds, (b) random pairs from single-seeded pods, and (c) random pairs from two-seeded pods, using both randomly amplified polymorphic DNA (RAPD) and isozymes in five trees. We found that the pairs of seeds developing within a pod are genetically more similar than any random pairs of seeds in a tree. Thus the formation of two-seeded pods appear to be associated with increased genetic relatedness among the developing seeds. We discuss the results in the context of possible fitness advantages and then discuss the possible mechanisms that promote tolerance among related seeds.

Divisions:Concordia University > Faculty of Arts and Science > Biology
Item Type:Article
Authors:Mohana, G. S. and Shaanker, R. Uma and Ganeshaiah, K. N. and Dayanandan, Selvadurai
Journal or Publication:American Journal of Botany
Date:July 2001
Keywords:Dalbergia sissoo; Fabaceae; genetic relatedness; inclusive fitness; kin selection; seed abortion; sibling rivalry
ID Code:6708
Deposited On:09 Jun 2010 18:09
Last Modified:08 Dec 2010 18:17
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