Mechanism of cross sterility in sorghum

Murty, U.R. and Rao, N.G.P. (1980) Mechanism of cross sterility in sorghum. Indian Journal of Genetics and Plant Breeding, 40 (3). pp. 562-567.

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Growth of the pollen tube and its entry into the embryo sac were examined in normal and cross sterile Sorghum bicolor (L.) Moench. In normal sorghum, pollen tubes reached the embryo sacs by 2 hrs after pollination. One of the synergids of the embryo sac degenerated before the entry of the pollen tube but after pollination. Entry of the pollen tube into the embryo sac was always through the degenerating synergid. In cross sterile sorghum, growth of the pollen tube was nearly normal following self-pollination. However, pollen tube growth was arrested when foreign pollen was used. Very few pollen tubes reached the embryo sac 4 hrs after cross pollination. The synergids were normal and the pollen tubes could not enter the embryo sacs. In a few cases where they entered the sac, it was not through the synergid. Pollen tubes travelled all over the sac and some of them could enter the sac through the embryo sac wall. Cross sterility in sorghum was brought about by an arresting of the pollen tubes and a mechanical inhibition to fertilization manifested through failure of degeneration of one of the synergids

Item Type: Article
Author Affiliation: National Research Centre for Sorghum, IARI Regional Station, Hyderabad-500 030
Subjects: Crop Improvement > Genetics/Genomics
Crop Improvement > Plant Breeding
Divisions: Sorghum
Depositing User: Ms K Syamalamba
Date Deposited: 20 Dec 2012 05:41
Last Modified: 20 Dec 2012 05:41
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