Chiasma Studies in Structural Hybrids

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Abstract
Two heterozygotes were found in a commercial variety of A. fistulosum L. (2n=16). One was deficient for a satellite, the other for a reciprocal translocation. In the unequal arm of the deficient heterozygote a single chiasma was formed at MI in about 80% of the PMC examined from one plant. Equational separation at AI in this pair takes place in about the same proportion (80%). In the translocation heterozygote 2 pairs of chromosomes were distinguished each being heteromorphic for the long arms. Frequencies of a single chiasma in the long arms of the 2 pairs was 80% and 48% respectively. In good conformity with these 2 values were the frequencies of equational AI separation of the two pairs, namely 75% and 46%. These 2 findings are in agreement with chiasma-type hypothesis in accounting for the cytological configuration of the chiasmata.

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