Effect Of Rice Tungro Disease (Rtd) On Biochemical Changes Of Promising Rice Genotypes

Abstract

Biochemical changes were found to be induced in rice leaves due to infection by rice tungro disease. The carbohydrate fraction viz., reducing sugars, non-reducing sugars, total sugars and starch content were significantly differed in RTD inoculated and uninoculated plants irrespective of the rice cultivars. The inoculated plants of susceptible rice cultivars showed highest increase in carbohydrate fractions with the advancement of the plant age as compared to moderately resistant and resistant rice cultivars. Among the nine rice cultivars tested, the increase in carbohydrate fractions was found high in susceptible rice cultivar T(N)1 74.5 %, 69.6 %, 71.7 % and 55.5 % at 40 days after inoculation. Total phenol content was decreased in susceptible rice cultivar T(N)1 (22.9%, 45.3% and 60.5%), CO 39 (21.1%, 41.0% and 59.3%) and MTU 1010 (19.2%, 37.5% and 53.7%) at 20, 30 and 40 DAI, respectively. Biochemical parameters viz., reducing sugars, non-reducing sugars, total sugars and starch content were found high in susceptible rice cultivars (T(N)1, CO 39 and MTU 1010) as compared to moderately resistant (IR 64, RPBIO 226 and MTU 7029) and resistant rice cultivars (Vikramarya, Utrirajapan and Nidhi). The phenol content of susceptible rice cultivars (T(N)1, CO 39 and MTU 1010) was observed to be decreased over moderately resistant and resistant rice cultivars.