Correlation of resistance to brown planthopper, Nilaparvata lugens (Stal) with biochemical variations in identified rice genotypes

Abstract

Twelve selected rice genotypes which are found resistant to BPH along with susceptible check, TN 1 and resistant check, PTB 33 were evaluated for their biochemical basis of resistance. The total sugar content in the selected genotypes ranged from 19.16 (MCM 125) to 27.56 (MTU2846-58-1-1-1) mg g-1 as against the lowest recorded in resistant check, PTB 33 (18.93 mg g-1). The total phenols ranged from 6.07 (MTU2842-36-1-1-1) to 8.62 mg g-1 (MTU2837-31-1-1-1) as against 5.35 mg g-1 in susceptible check, TN 1 and 10.98 in resistant check, PTB 33. With respect to the protein content, highest protein content was observed in MTU2843-239-1-2-1 (4.70 mg g-1) followed by MCM 125 (4.01 mg g-1). The amino acid content was more in susceptible check TN 1 and less in resistant check PTB 33 with 4.99 and 2.93 mg g-1, respectively. Maximum silica content was observed in MTU2843-52-1-1-1 (7.93%) followed by MTU2837-56-1-1-1 (7.53%) as against resistant check PTB 33 with 8.68 percent. The total sugar, proteins and free amino acids showed significant positive correlation to BPH population whereas, the total phenol and percent silica showed significant negative correlation to BPH population.