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Effects of Inbreeding on Triticale Selected for Two Levels of Fertility and Chiasma Frequency¹

Two tritlcale (x Triticosecale Wittmack) populatlons, one with a high chromosomal chiasma frequency and high fertility level and the other with a low chiasma-fertillty index, were selected from a bulk population of the cultivar ‘Rosner.’ Results indicated the lack of relationship between chlasma frequency and seed-set upon in. breeding when selection was on the basis of a high chlasma-fertility index. In contrast, a positive relationship was found to exist between these same two variables when selection was on the basis of a low chiasma-fertility index. These results suggest that for early generation hybrids involving triticale amphiploids in which the chiasma-fertility index is normally low, a response to simultaneons selection could be obtained. This would not,hold true, however, as the chlasma-fertility index rose above some specific threshold.

Key Words: Synthetic amphiploids • Correlated characters

² Former graduate student (presently at Department of Botany, University of Rangoon (A&S), Burma) and Professor, Deparment of Plant Science, University of Manitoba, Winnipeg, Canada.

Received for publication May 29, 1973.