Possibility of Expanding Genetic Variation by Limited Pollination Based on the Reproductive Success Rate (RSR) of Pollen Grains Deposited on Stigma
We have already proposed the new concept of “Reproductive Success Rate” (RSR) pertaining to the pollen grains deposited on a stigma and the ovules in a pollinated flower (Namai and Ohsawa 1986). The RSR of pollen grains deposited on a stigma (RSR-P) and the RSR of ovules in a pollinated flower (RSR-O, i.e. ordinary seed set percentage) are calculated from the following equations: RSR-P(%) = (No. of seeds obtained) × 100 / (No. of pollen grains deposited) RSR-O(%) = (No. of seeds obtained) × 100 / (No. of ovules in pollinated flower) We also described the possible effect of the number of pollen grains deposited on a stigma to RSR-P and RSR-O such that the highest RSR-P is accomplished under limited pollination with about 1:1 ratio of pollen grains deposited to ovules in pollinated flower. Such limited pollination is presumed to give rise to the lowest intensity of male gametic competition in post pollination.
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