Morphological and Biochemical Basis of Resistance in Indian Bean, Lablab purpureus var. typicus (L.) Sweet Varieties against Pod Borers

Abstract

Background: Indian bean, Lablab purpureus var. typicus (L.) Sweet (family: Fabaceae) is an important vegetable crop in India and other countries. The main reasons of variability in the pattern of resistance shown by different genotypes were explained by Painter (1951). Antibiosis is an adverse impact of the host plant on the biology of the insect pests and their progeny due to the biochemical and biophysical factors present in it.\nMethods: The experiment was laid out in a simple randomized block design (RBD) with seven treatments, each replicated thrice. The plot size was 1.8x1.8 m2 keeping row to row and plant to plant distance of 45 cm each. The Indian bean varieties, Arka Jay, Konkan Bhushan, Diana, Bauni, Pari, JK Special and Ganganagar local were sown on 25th July in Kharif, 2019 (July-November). Horticulture Farm of S.K.N. College of Agriculture, Jobner (Rajasthan). The recommended package of practices was followed to raise the crop. Various morphological parameters, viz., pod length, pod width, pod shell thickness, pod weight and number of seeds per pod were noted. The biochemical parameters, viz., moisture content, phenol content, total sugars, total protein and fibre content were analyzed. Result: The results obtained were subjected to correlation and regression analysis to draw the impact of these parameters on pod damage. Morphological parameters like pod length, pod shell thickness showed positive correlation (r = 0.77) with pod damage. Biochemical parameters like moisture content in pods, total sugars, reducing and non-reducing and protein content showed a positive correlation (r = 0.84, 0.86, 0.82, 0.89 and 0.79) with pod damage. Phenol content and fibre content in pods had a negative correlation (r = -0.93 and -0.89) with pod damage.\n