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On the nonautonomy of the small-kernel phenotype produced by B–A translocations in maize

Published online by Cambridge University Press:  14 April 2009

James A. Birchler
James A. Birchler
Affiliation:
Department of Biology, Indiana University Bloomington, Indiana 47401

Summary

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Several of the B–A translocations of maize produce a small-kernel phenotype which is associated with hypoploid endosperms from fertilizations by sperm which result from nondisjunctional events of the B centromere at the second microspore division. Lin (1975) demonstrated that the small-kernel phenotype was not a consequence of the deficient nature of said endosperms, but involved a differential effect of male and female chromosomal regions.

The TB-A effect has been examined for evidence of autonomy in mosaics for the most extreme such case known, i.e. the small-kernel effect produced by the compound B–A translocation, 1La-5S8041. Although reduced-sized kernels are formed when the paternal contribution of the 1L-5S element is totally lacking from the endosperm, sectorial loss has no detrimental effect on dry weight. This phenomenon is therefore considered to be nonautonomous.

Type
Short Paper
Information
Genetics Research , Volume 36 , Issue 1 , August 1980 , pp. 111 - 116
Copyright
Copyright © Cambridge University Press 1980

References

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