Abstract
SUMMARYSeveral 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.
Subject
Genetics,General Medicine
Reference14 articles.
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2. A new compound A–B translocation, TB-5S, 1L(8O41);Robertson;Maize Genetics Cooperation Newsletter,1975
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4. CHROMOSOME ORGANIZATION AND GENIC EXPRESSION
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