Maintenance of male sterility in plant populations. III. Mixed selfing and random mating

Ross, M.D. and Weir, B.S. (1975) Maintenance of male sterility in plant populations. III. Mixed selfing and random mating. Heredity, 35 (1). pp. 21-29.

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Abstract

Two models of monogenic recessive male sterility are presented, first where the male-steriles are always fully pollinated (full-fitness model) and second where they are only pollinated to the extent that hermaphrodites are crossed (limited-fitness model). Male-steriles in both models may be maintained by overdominance at the sex-control locus or by having greater ovule or seed fertility than hermaphrodites. For both models fitness of male-steriles is frequency dependent under random mating or under mixed selfing and random mating, and for the case when male-steriles are maintained only by increased fertility, expressions are derived for their equilibrium proportions and those of both hermaphrodite genotypes. Also for this latter case, fitness of male-steriles in equilibrium populations equals that of the hermaphrodites. In the full-fitness model the degree of selfing among hermaphrodites has little effect on equilibrium proportions of male-steriles, which may decline slowly, increase slowly, or remain constant with increased selfing. Except under random mating, equilibrium proportions of male-steriles are lower in the limited-fitness model and decline with increased selfing among hermaphrodites. Outcrossing rates for pollen of hermaphrodites are derived.

Item Type: Article
Additional Information: SNNigam Collection
Author Affiliation: Grasslands Div., DSIR, Palmerston North, New Zealand.
Subjects: Crop Improvement > Genetics/Genomics
Crop Improvement > Plant Breeding
Divisions: General
Depositing User: Mr Balakrishna Garadasu
Date Deposited: 02 Apr 2013 10:12
Last Modified: 02 Apr 2013 10:12
Official URL: http://dx.doi.org/10.1038/hdy.1975.64
URI: http://eprints.icrisat.ac.in/id/eprint/10039

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