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Further investigations on pentaploid Triticum hybrids VII. Relation between chromosome number and fertility in the back-crosses of the hybrid T. polonicum x T. Spelta to the parents



Further investigations on pentaploid Triticum hybrids VII. Relation between chromosome number and fertility in the back-crosses of the hybrid T. polonicum x T. Spelta to the parents



Jap. J. Bot, 8: 205-14



The fertility of back-cross individuals from the crosses F1 x T. polonicum and reciprocal gave a negative correlation with chromosome number, which ranged from 28 to 35. The progeny of the other two back-crosses, T. Spelta x F1 and reciprocal, shewed the opposite relation, fertility being positively correlated with chromosome number, which ranged from 35 to 42. This agrees with the results in the descending (chromosome numbers 28 to 34) and ascending (36 to 42) groups in the F2.

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