Effect of Chemical Mutagens on Fiber Fineness of Egyptian Cotton
Feb 6, 2019

WCRC WCRC2 Breeding

This research aimed at studying the effect of triethanolamine (TEA) (0.02%) and dimethylsulphate (DMS) (0.025%) on fiber fineness, in the two Egyptian cotton varieties: Menoufi and Giza 74, and in the F1, F2, Bc1, and Bc2 of their hybrid. The study was carried out on the M1 and M2 of the two chemical mutagens. The fieldwork continued for three successive seasons. Both TEA and DMS treatments increased the means of fiber fineness in most of the six populations for M1 and M2 generations. Highly significant values were obtained in F2 in M1 and M2 for the TEA treatment, while a highly significant value showed in the F2 of M1 only for the DMS treatment. Significant and highly significant inbreeding depression and epistasis, except E2 in M1,were found for the TEA treatment. Conversely, insignificant heterosis, inbreeding depression and epistasis were obtained for the DMS treatment and the control. The genetic variance was only due to the additive effect in the control. In the TEA treatment, all the genetic variance was due to dominance effects for both mutant generations, while in the DMS treatment all the genetic variance was additive variance in M1, and additive variance was larger than dominance variance in M2 for the same treatment. Broad and narrow sense heritability values and genetic advance on selection decreased after both treatments except broad sense heritability of M2 in the DMS treatments.

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