Resistance in Paddy Genotypes against Sitotroga cerealella (Oliv.) (Lepidoptera, Gelechiidae)

The Angoumois grain moth, Sitotroga cerealella (Oliv.) is one of the principal causes of the loss of paddy grains in storage, which indirectly affects the food security. Paddy genotypes exhibit varying degree of susceptibility and was found by laboratory studies, using Dobie’s susceptibility index. Though significant differences were observed in susceptibility, no genotype was completely immune and highly susceptible to the infestation, but some genotypes showed moderate resistance. Qualitative analysis was done for six paddy genotypes, three each from moderately resistant and susceptible category to estimate the starch, protein, total phenol, amylose contents and amylase inhibitor activity. Moderately resistant genotype viz., CB 14528, CB 16146, TM 12202 possessed higher amount of starch (73.83 - 70.50 mg/g), phenol (0.76 - 0.60 µg/g), amylose (25.79 - 24.15%) and lower amount of protein (3.33 mg/g - 4.27 mg/g) and amylase inhibitor activity (IC 50) (28.0 - 50.18 µg/mL) compared to susceptible ones. The phytochemicals present in selected moderately resistant (CB 14528) and susceptible genotypes (AD 13299) were analyzed using TD GC-MS. The above results were analyzed to know the cause of resistance in paddy genotypes against this notorious pest.

Sandra Maria Mathew1, S. Jeyarajan Nelson*2, R. P. Soundararajan3 and D. Uma4 Click here to download file

Research Article | Published online : 25-Feb-2021