Vol. 12, Issue 10 (2023)

Author(s):
S Prabu, Sheela Venugopal, M Suganthy, R Suresh, S Vellaikumar, D Uma and P Mathankumar

Abstract:
Rice landraces viz., Mysore Malli, Chetty Samba, Panamara Samba, Vellai Gundu Samba, Vellai Kombi Samba and standard susceptible and resistant checks, TN 1 and PTB 33, resp., were evaluated for unveiling their biochemical constituents such as total sugars, total protein and total phenols upon infestation by the major sucking pest of rice, Brown Planthopper (BPH). Total sugars and total protein content in healthy samples of rice landraces showed significant differences in their content when compared with the susceptible check. BPH infestation reduced the total sugars and total protein content. BPH infested susceptible check, TN 1 showed highest reduction in total sugars and total protein (34.46 & 44.26%, resp.) over healthy plants and lowest reduction was observed in PTB 33 (20.67 and 25.10%, resp.). Total phenol content was highest in healthy PTB 33 (5.25 mg/g) followed by the resistant landrace, Mysore Malli (4.91 mg/g), when compared to the susceptible check TN 1 (2.41 mg/g) and as a result of BPH infestation, all the tested entries showed increase in phenol content. After BPH infestation, highest percent increase of phenol content over healthy plants was observed in PTB 33 (47.44%) followed by Vellai Kombi Samba (46.08%) and lowest in TN 1 (31.11%). Thus the lower sugar and protein content and increased phenol content in resistant landraces were responsible for the antibiosis basis of resistance against BPH.