volume 28 issue 4 (december 2008) : 241 - 245
HETEROSIS FOR GRAIN YIELD AND HEAT TOLERANCE CHARACTERS IN BREAD WHEAT (TRITICUM AESTIVUM L.)
1Department of Plant Breeding and Genetics,
MPUAT, Rajasthan College of Agriculture, Udaipur - 313 001, India
ABSTRACT
10 parents (C 306, GW 190, HD 2687, Hindi 62, NI 5439, PBW 343, Raj 3077, Raj 3765, UP 2335 and UP 2425) and their forty-five F1s, obtained by crossing in diallel fashion (without reciprocal) were evaluated during rabi 2002–03 for grain yield pewr plant and heat tolerance characters in very late sowing condition. The objective was to assess the magnitude of heterosis and heterobeltiosis for grain yield and heat tolerance characters under heat stress conditions. None of the crosses showed uniformly high heterosis for all the characters under the study. Out of forty-five crosses, sixteen and ten crosses exhibited significant and positive heterosis and heterobeltiosis for grain yield per plant. The magnitude of heterosis and heterobeltiosis for grain yield per plant varied from −31.75 to 97.50 and −33.25 to 95.64 per cent. The most of the high heterobeltiotic crosses for grain yield per plant also depicted significant heterobeltiosis for one or more heat tolerance characters also, particularly for praline content, seedling vigour index and heat injury
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