Seed abortion in Pongamia pinnata (Fabaceae)

Arathi, H. S. ; Ganeshaiah, K. N. ; Uma Shaanker, R. ; Hegde, S. G. (1999) Seed abortion in Pongamia pinnata (Fabaceae) American Journal of Botany, 86 (5). pp. 659-662. ISSN 0002-9122

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In Pongamia pinnata only one of the two ovules develops into a seed in most of the pods. Since pollen was not found to be limiting and reduced fertilization could not completely explain the observed frequency of seed abortion, it implied an effect of postfertilization factors. Aqueous extracts of developing seeds and maternal tissue (placenta) did not influence abortion in vitro, suggesting that abortion may not be mediated by a chemical. Experimental uptake of 14C sucrose in vitro indicated that both the stigmatic and the peduncular seed have similar inherent capacities of drawing resources, but the peduncular seed is deprived of resources in the presence of the stigmatic seed. This deprivation of the peduncular seed could be offset by supplying an excess of hormones leading to the subsequent formation of two seeds in a pod. The prevalence of single-seeded pods in P. pinnata seems therefore to be a result of competition between the two seeds for maternal resources. The evolutionary significance of single-seeded pods in P. pinnata is discussed with respect to possible dispersal advantage enjoyed by such pods.

Item Type:Article
Source:Copyright of this article belongs to Botanical Society of America, Inc.
Keywords:Tomato; Genotypic Difference; Ovules; Matured Seeds And Seed Abortion
ID Code:13232
Deposited On:11 Nov 2010 06:53
Last Modified:16 May 2016 22:26

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