CHROMOSOMAL INSTABILITY IN A HYBRID BETWEENHORDEUM VULGAREANDSECALE VAVILOVII

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Abstract
A hybrid was obtained between H. vulgare L. cv. Betzes (2n = 2x = 14) and S. vavilovii [Nurn. (2n = 2x = 14)] in which chromosome instability occurred in somatic and meiotic tissues. In somatic tissue, the chromosomes per cell varied from 7 to 24 with a mean of 19.7. Similarly in meiotic tissue, the chromosome number varied from 14 to 26 with a mean of 18.3. The mean chiasma frequency was 12.9 consisting of an average MI [mitotic index] configuration of 0.02IV + 0.3111 + 6.6811 + 3.921. Evidently, the hybrid was derived from the union of an unreduced gamete from cv. Betzes barley with a normal gamete from S. vavilovii.