Chromosome Length in Relation to Transmission of Extra Chromosomes in Maize

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The chromosome numbers of 178 plants from triploid × diploid crosses of maize (Zea mays L.) were determined and 171 plants were hyperdiploids with 2n=21 to 2n=28. The karyotype analysis of the hyperdiploid plants have shown that the chromsomes 1, 3, 9 and 10 were transmitted through the female gamete of the triploid in relatively higher frequency, whereas chromosomes 5 and 8 were transmitted less and chromsome 6 was transmitted the least. The longer chromosomes were not selectively transmitted and hence, it disagrees with the proposition of Einset (1943) that in maize the transmission of extra chromosome is a function of the length of that chromosome.