Biochemical Constituent of Brassica Juncea Genotypes In Relation To Mustard Aphid (Lipaphis Erysimi Kalt.) Infestation

Selected thirty genotypes of Brassica juncea were evaluated for mustard aphid infestation on the basis of average number of aphids per plant and their bio-chemical analysis was carried out at flowering stage. Higher sinigrin content was obtained in genotype RH 7846 (73.49 µ mole/g DM) and lower in Kranti (31.02 µ mole/g DM). A highly significant and negative correlation was observed between sinigrin content and aphid infestation. Phenol content varied from 1.4 % (Varuna) to 2.44 % (RH 7846). The correlation coefficient between phenol content and aphid infestation index was negative and significant. The amount of waxes in leaves of Brassica juncea genotypes varied from 2.62 % (RB 50) to 5.22 % (RH 8701 & RLM 198). The correlation coefficient between waxes content in leaves of plant and mustard aphid infestation was negative and non-significant.