FEEDING INDUCED CHANGES IN PHENOLICS AND PATHOGENESIS-RELATED PROTEINS: IMPLICATIONS HOST RESISTANCE TO Bemisia tabaci Genn. AND Helicoverpa armigera Hiib. IN TOMATO ACCESSIONS

R. SRINIVASAN, S. UTHAMASAMY

Abstract


Induction of Pathogenesis - Related (PR) proteins and phenolics occur in  tomato upon feeding by the whitefly, Bemisia tabaci Genn. and tomato fruit borer,  Helicoverpa armigera Hub. The induction of PR proteins such as chitinases and  fl-1,3-glucanases began after 72-96 h of feeding by whitefly. The activity of these PR  proteins varied with the accessions. A maximum of4.40 GlcNAc nmol / min lg of fresh  tissue of chitinases has been observed in COTLCVRH 3 whereas the susceptible  accession LE 591 has recorded only 1.80 G1cNAc nmol /min/ g of fresh tissue. The  induction of [3-1,3-glucanases in tomato plants infested with whitefly follows similar  pattems, i.e., the 1,3-glucanases level is found to be high in COTLCVRH 4 (S2 pg  glucose released 1min 1 g of fresh tissue). After feeding by tomato fruit borer, the systemic  induction of total phenol was 2.00 to 3.00 fold. Similarly, 1.50 to 3.50 fold increase was  observed in selected tomato accessions due to feeding by whitefly. The induction was  marginally higher in susceptible tomato accessions than in resistant accessions though  the changes were not statistically significant. There was substantial increase in the  quantity of tannins as a result of feeding by tomato fruit borer and whitefly. Tomato fruit  borer feeding induced 1.50 to 2.00 fold increase in tannins in different tomato accessions  whereas 2.00 to 4.00 fold increase was observed due to feeding by whitefly.


Keywords


Bemisia tabaci; feeding; Helicoverpa armigera; PR proteins; tannin; tomato; total phenol

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