GrainGenes Reference Report: AJB-81-1502
Reference
AJB-81-1502
Title
Genetic control of B chromosome transmission in Aegilops speltoides (Poaceae)
Journal
American Journal of Botany
Year
1994
Volume
81
Pages
1502-1507
Author
Cebria A Navarro M Puertas M
Abstract
The transmission of B chromosomes in Aegilops speltoides was studied in 1B and 3B plants 1B plants tend to lose the B, while the Bs are accumulated in 3B plants with respect to Mendelian expectation The experimental conditions permitted us to deduce the number of Bs transmitted in the egg cells The quantitative character 'mean number of Bs transmitted in the egg cells' shows a large variation in both types of plants We have carried out a mass selection experiment, selecting those plants with the highest and the lowest values for this character A genetic component of such variation was demonstrated because significant selection gain was obtained for high transmission rate in 1B plants, and low transmission rate in 3B plants We have also estimated some fitness variables and their relationship with B transmission by the egg cell. We found that vigor variables are not correlated with B transmission variation. However, in 3B plants there is a significant negative correlation between B transmission rate and fertility, measured as grains per plant and grains per spikelet. It seems that natural selection acts at this level, balancing the strength of the drive and preventing the excessive increase of B number.
Keyword
aegilops
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GrainGenes Reference Report: AJB-81-1502
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GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture. | |||