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DEVELOPMENT OF ADVANCED COTTON MUTANT LINES RESISTANT TO CLCuV DISEASE, HIGH YEILDING WITH SUPERIOR FIBRE QUALITY TRAITS DEVELOPED THROUGH THE USE OF INDUCED MUTATION
Abstract
Considering the continous persistancy C1.CuV disease. fibre quality of present grown commercial cultivars a massive research breeding program aimed producing early maturing. high yielding. CLOV resistant superior fibre quality mutants was undertaken in the year 1993 / 1994 and have expanded since. Treatment of one locule bulk: F, seed derivative of' cross between interspecific mutant (ISM) strain NIAB-313 (Gossyptum barbadense L. × Gossypium hirsutum L.) with exotic (Reba P-288) was done at 20, 25 and 30 Kr (Co'") gamma (Y) radiation doses. Radiation treatment at 30 Kr dose proved to be successful for creating valuable genetic variability. Mo seed was used to raise M, and subsequent segregating generations for the selection of desirable segregants. Nine promising high yielding superior fibre quality mutant lines (Ma) i.c. N-358/2. N-358/4. N-358/8, N-358/15. N-358/17. N-358/22 and N-358/30 that do not support virus accumulation even upon suhjecting to extensive whitely-mediated inoculation SCuV spreader line. and modified bottle shoot graiting.
