Genetic study of root length in spring wheat (Triticum aestivum L.) under salinity
2006
Tahira (University of Agriculture, Faisalabad (Pakistan). Dept. of Plant Breeding and Genetics) | Salam, A. (University of Agriculture, Faisalabad (Pakistan). Dept. of Plant Breeding and Genetics)
A 6 x 6 diallel cross was conducted involving pre-screened 3 sensitive (18180-II, 18205-I, DN-18) and 3 tolerant (18194-II, DN-4, LU26S) wheat genotypes. Thirty-six genotypes were sown in a triplicated completely randomized design in hydroponic culture. The data for root length was recorded in three salinity levels i.e. control (1.5 dS m-1), 10 and 15 dS m-1. The results suggested that both additive and non-additive genes under saline and non-saline conditions affected total variation for root length. In control, additive and non- additive genes affected 25% and 79% of the total variation, whereas in 10 dS m- 1 non-additive genes affects (56%) were greater than additive gene affects (33.5%). In, 15 dS m-1 both additive and non-additive genes contributing almost equally (34%). The genotype DN-4 under non-saline condition, while under saline condition the 18194-II under saline condition, DN-4 and LU-26S seemed to be good general combiner. The cr oss combinations highest specific combining ability for root length were 18194-II x DN-4, 18180-II x 18205-I and LU26S x DN- 18 under control, 10 dS m-1 and 15 dS m-1, respectively. In reciprocals the crosses DN-18 x DN-4 and DN-4 x 18205-I appeared to be superior to the others under low and high salinity levels, respectively.
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