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Significance of Pollen Amount for Fertilization
D. V. Ter-Avanesian
Bulletin of the Torrey Botanical Club
Vol. 105, No. 1 (Jan. - Mar., 1978), pp. 2-8
Published by: Torrey Botanical Society
Stable URL: http://www.jstor.org/stable/2484256
Page Count: 7
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Pollination of the flower stigma by either single pollen grains or by a greater quantity is shown to play a significant role in progeny behaviour. Evidently, limited pollination disturbs natural competition between germinating pollen tubes, and only those are involved in fertilization which do not participate in the sexual process under normal conditions. This, in its turn, leads to the development of new genetic features in the progeny. Moreover it was established that hybridization by single pollen grains placed on the cotton or wheat flower stigma changes the way of segregation in the F2. There appear new features, which are not usually observed with normal hybridization. The great number of pollen tubes usually growing into the flower ovary create the biological environment where the formation of the embryo in its subembryonic stage of development takes place, i.e. the sexual process is a complicated physiological process not limited to the blending of two gametes of different sex. Reducing the quantity of pollen grains enlarges the range of variability in plants resulting from both self-pollination and hybridization.
Bulletin of the Torrey Botanical Club © 1978 Torrey Botanical Society