PJB-1999-45
ISOZYME MARKERS IN COTTON BREEDING-III. VARIATION IN THE INTENSITY OF ISOZYMES OF ENZYME PEROXIDASE HIBITED BY DIFFERENT LOCI OF DIFFERENT COTTON VARIETIES AND THERE RELATIONSHIP WITH COTTON LEAF VIRUS DISEASE
SHAFQAT FAROOQ AND HINA SAYYED
Abstract
Isozymes of the enzyme peroxidase was studied in different resistant, tolerant and susceptible varieties of cotton growing at a location known as a hot spot for cotton leaf curl virus disease. Plant material used for extraction was collected from the field in the month of September when leaf curl virus disease its peak and the results were compared with those obtained in July when disease intensity stays in 50 to 80%. Significant differences were observed in the Pox. activity (as measured by the intensity;) exhibited by different loci in different varieties while among different varieties, variation in mean activity of 7 loci was generally not significant. In most of the cases, Pox. activity increased with in virus intensity from July to September. The differences due to locations in Pox. activity exhibited specific locus in a variety were mostly non-significant in September compared to July when they were not. When differences in mean Pox. activities of 3 varieties growing simultaneously at three locations onth of July and September were compared, significant increase in the activity was observed at locus 1 in varieties growing at location-1 while locus 7 exhibited progressive decrease in the activity at location 111. The mean varietal Pox. activity increased in all the varieties and at all the 3 locations but the differences were not significant. Prevalence of cotton leaf curl virus at location-Ill appeared to be positively correlated JS 4a and 6 under low to medium virus intensity while under high virus intensity, locus 2 appeared to lated with increased Pox. activity. Possibilities of using Pox. activity as marker for selection of to be cultivated under the areas of high disease intensity are discussed.
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