Genetic Analysis of Resistance to Bacterial in Some Crosses of Cotton (Gossypium Hirsutum L.)

الملخص

      Bacterial blight of cotton affects all plant parts during all growth stages.  The disease can be extremely damaging under Sudan conditions particularly, to long staple cotton (gossypium barbadense).  All commercial cotton cultivars grown in Sudan are susceptible to the new race of the bacterium.  Breeding for blight resistance has become a major objective in cotton breeding program.  Therefore, if improvement of resistance is to be made, and understanding of its genetical basis  is essential.  Quantitative analysis to bacterial blight indicated additive, dominance, and epistatic gene action (Wallace and El-Zik, 1990).  A substantial number of diallel studies indicated the importance of both additive and dominance effects on bacterial blight resistance (Innes and Brown, 1969; Wallace and El-Zik 1990).  Estimates of gene effects involved in the inheritance of bacterial blight resistance from four cotton cultivars crosses are reported in this study.