Combining Ability and Gene Action for Different Root Characters in Spring Wheat

Abstract

Combining ability and gene action for different root characters were studied in seven genotypes of spring wheat and their 21 F1s obtained from a diallel crosses. The experiment was conducted with 45 days aged plant in poly bags at the field laboratory of Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh. The parent Kheri was the best general combiner for different root characters. The crosses Sebia × SA-92, Sebia × HT-7 and SA-92 × Kheri showed positive and significant SCA effects for root length.VrWr graph analysis showed that dry weight of root and shoot root ratio indicates epistasis. Whereas root length and dry weight of shoot showed over dominance. The crosses with SCA significant effects for root characters may be used in hybrid development in spring wheat.

DOI: http://dx.doi.org/10.3329/jesnr.v5i2.14605

J. Environ. Sci. & Natural Resources, 5(2): 73-76 2012