Vol. 10, Issue 12 (2021)

Author(s):
Ashwini R, Amaresh YS, Yenjerappa ST and RV Beladhadi

Abstract:
Bhendi powdery mildew caused by Erysiphe cichoracearum DC. is important foliar disease affecting all the stages of the plant growth by causing premature defoliation and resulting 17.0 to 86.6 per cent yield loss in bhendi. Biochemical studies were carried out to know the biochemical changes due to powdery mildew using different okra genotypes. Results revealed that, i.e., lower amount of reducing, non-reducing and total sugar of 10.16, 9.24, 19.40 mg g^-1 was recorded in moderately resistant genotype (EC329404), while highly susceptible genotypes viz., Arka Anamika and IC42531 recorded higher amount of reducing, non-reducing and total sugar of 16.65 and 15.47 mg g^-1, 20.12 and 19.10 mg g^-1, 36.77 and 34.57 mg g^-1 respectively in diseased leaf and were found on par with each other. Healthy leaves of highly susceptible genotypes (Arka Anamika and IC42531) have recorded 6.4, 6.1 mg g^-1 of total phenol which increased to 9.95, 8.63 mg g^-1 after infection by E. cichoracearum. The increase in phenol content was at higher rate in moderately resistant genotype i.e., EC329404; before infection phenol content recorded was 9.7 mg g^-1 and it increased to 16.29 mg g^-1 after infection by E. cichoracearum. It was noticed that sugar content and resistance to disease were negatively correlated while phenol content and resistance to disease were positively correlated.