Role of bio-chemical paramaters for resistance to mustard aphid;Lipaphis erysimi (Kaltenbach) incidence
2012
Kumar, D. | Singh, S.P.
Selected 10 genotypes of five Brassica species were evaluated for their bio-chemical analysis to mustard aphid on the basis of pooled mean of aphid infestation index. Higher glucosinolate content was obtained in genotype T-27 (105.66 Jl mole/g DM) and lower in BSH-l (47.04 Jl mole/g DM). A highly significant and negative correlation was observed between glucosinolate content and aphid infestation. Pheno1 content varied ITom 1.46; (BSH-l) to 2.71; (T-27). The correlation coefficient between phenol content and aphi infestation index was negative and significant. The amount of waxes in leaves of Brassica genotypes varied from .91; (BSH-l) to 5.72; (T-27). The correlation coefficient between waxes content in leaves of plant and mustard' aphid infestation was negative and non-significant. Total nitrogen varied ITom 3.54; (HNS 9605) to 4.75; (BSH-l) ~nd had positive significant correlation with aphid infestation. Total sugar varied ITom 6.87; (T-27) to 10.50; (BSH-l) and presented positive significant correlation with aphid infestation.
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