Increasing Genetic Variability in Common Wheat by Utilization of Alien Cytoplasms-Cytoplasmic Effects on the Performance and Interplant Variability of the F₁ and F₂ Generations of the Cross, Triticum aestivum cv. Norin 26×cv. Norin 61

Abstract

As a part of a series of investigations on enlarging the genetic variability in commorl wheat by using alien cytoplasms, the effects of five fertile, alien cytoplasms on (1) performance and interplant variabllity of the parental lines, (2) heterosis and interplant variability of the F₁ generation, (3) performance and variability of the F₂ generation, and (4) heritability, in its broad sense, of agronomically important characters were studied by making reciprocal crosses between a euplasmic line of Triticum aestivum cv. Norin 61 (abbrev. N61) and a euplasmic and five alloplasmic lines of another cultivar, Norin 26 (N26). The alien cytoplasms used were of Aegilops longissima, Ae. squarrosa, Ae. vavilovii, Ae. speltoides and Ae. kotschyi, each representing the B, D, D2, S and Sv plasma types, respectively. All the seven parental lines. F₁ hybrids of 12 cross combinations, and 12 F₂ populations obtained by self-pollinatlon of the F₁'s were grown in the randomized blocks with four replications. The number of plants grown in each replication is lO, 4 and 50 for the parental, F₁ and F₂ lines, respectively. Thirteen characters were observed for all plants. The main results obtained are as follows ;