Journal of Environmental Biology

Biochemical constituents influencing thrips

resistance in groundnut germplasm

Subhash B. Kandakoor¹, H. Khader Khan¹, A.K. Chakravarthy¹*, C.T. Ashok Kumar¹ and P. Venkataravana²

¹University of Agricultural Sciences, Department of Entomology, Gandhi Krishi Vignan Kendra, Bangalore-560 065, India

²Department of Genetics and Plant Breeding, Agricultural Research Station, Chintamani-563 125, India

*Corresponding Authors Email : chakravarthyakshay@gmail.com

Publication Data

Paper received:

24 April, 2013

Revised received:

02 September 2013

Re-revised received:

26 October 2013

Accepted:

30 October 2013

Abstract

Field screening of 56 groundnut genotypes revealed that none reacted as highly resistant to thrips. However, 13 genotypes of 56 collected and screened genotypes acted as resistant, 25 as moderately resistant and 11 as moderately susceptible. Phenols and tannins showed significant and negative relationship with number (r= -0.750, -0.864) and damage (r = -0.641, -0.784) of thrips. Total sugar (r = 0.313, 0.38), amino acids (r = 0.830, 0.723) and reducing sugars (r = 0.408, 0.337) showed positive relationship with number of thrips and their per cent damage. Linear regression analysis revealed that high amount of tannins and phenols contributed for thrips resistance in groundnut.

 Key words

Genotypes, Phenols , Sugars, Tannins, Thrips

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