1Department of Plant Breeding, G. B. Pant University of Agriculture and Technology, Pantnagar, 263 145
The genetic architecture of plant height, peduncle length, spike length and number of spikclets per main spike was studied in crosses between two triticales, UPT 72142 and Beagle, and two wheat varieties, HD 2009 and UP 319, employing the joint scaling test, two genetic models—additive—dominance, and digenic interactions. The models fitted successively in the order of increasing complexity on P1, P2, F1, F2, BC1 and BC2 generations of four crosses. The results revealed simple genetic situation in crosses UPT 72142 X HD 2009 and Beagle × UP 319 for number of spikelets per main spike, wherein only additive effects under additive dominance model accounted for the total genetic variation. But in other two crosses, main effects as well as nonallelic interactions were responsible for this character. in general, fixable as well as nonfixable effects were found responsible for plant height, peduncle length, and spike length. Appropriate breeding strategies for desired improvement in the above characters, based on this study, are suggested.
Triticale, gene effects, scaling test, genetic models, digenic interactions
