• K Vinayak

      Articles written in Proceedings – Plant Sciences

    • Sex-ratio variations inAcalypha fruiticosa Frosk along plant height and altitude

      R Vasudev K Vinayak K N Ganeshaiah R Uma Shaanker

      More Details Abstract Fulltext PDF

      The ratio of male to female flowers per inflorescence inAcalypha fruiticosa increases from bottom to top inflorescence of the plant and also along the altitudinal gradient. The increase is due to increase in male flower number per inflorescence. We explain these facultative changes in sex-ratio as fitness optimising strategies of the plant in response to altered success of males from the bottom to the top of the plant and along altitude which is primarily due to changes in pollen donation pattern.

    • Effect of domestication on seed packing cost in legumes

      P Gopala Reddy K Vinayak

      More Details Abstract Fulltext PDF

      The evolutionary shifts in the seed packing features of the plants during domestication were studied by comparing a set of domesticated legumes with the wild species. The domestication considerably reduced the packing cost of the seeds in terms of pod coat weight per unit weight of seeds. This reduction is a result of increased seed weight per pod and the average seed weight, probably at the cost of seed number per pod, while the podcoat weight per pod was maintained during domestication. Eventhough, the average seed weight increased by 8-fold from wild to domesticates, the increase in pod coat weight per seed was only 2-3-fold. It is possible to separate wild and domesticates into distinct clusters on the basis of their individual seed weight and packing costs. We discuss the evolutionary implications of these results.


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