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Higher accumulation of proteinase inhibitors in flowers than leaves and fruits as a possible basis for differential feeding preference of Helicoverpa armigera on tomato (Lycopersicon esculentum Mill, Cv. Dhanashree)

TitleHigher accumulation of proteinase inhibitors in flowers than leaves and fruits as a possible basis for differential feeding preference of Helicoverpa armigera on tomato (Lycopersicon esculentum Mill, Cv. Dhanashree)
Publication TypeJournal Article
Year of Publication2005
AuthorsDamle, MS, Giri, AP, Sainani, MN, Gupta, VS
JournalPhytochemistry
Volume66
Issue22
Pagination2659-2667
Date PublishedNOV
Type of ArticleArticle
ISSN0031-9422
Keywordsaccumulation of PI, Helicoverpa armigera, Lycopersicon esculentum, Midgut proteinases, Plant defense, Proteinase inhibitors
Abstract

Tomato (Lycopersicon esculentum, Mill; cultivar- Dhanashree) proteinase inhibitors (Pis) were tested for their trypsin inhibitory (TT) and Helicoverpa armigera gut proteinases inhibitory (HGPI) activity in different organs of the tomato plants. Analysis of TI and HGPI distribution in various parts of the plant showed that flowers accumulated about 300 and 1000 times higher levels of TI while 700 and 400 times higher levels of HGPI as compared to those in leaves and fruits, respectively. Field observation that H. armigera larvae infest leaves and fruits but not the flowers could be at least partially attributed to the protective role-played by the higher levels of Pis in the flower tissue. Tomato Pis inhibited about 50-80% HGP activity of H. armigera larvae feeding on various host plants including tomato, of larvae exposed to non-host plant Pis and of various larval instars. Tomato Pis were found to be highly stable to insect proteinases wherein incubation of inhibitor with HGP even for 3 h at optimum conditions did not affect inhibitory activity. Bioassay using H. armigera larvae fed on artificial diet containing tomato PIs revealed adverse effect on larval growth, pupae development, adult formation and fecundity. (c) 2005 Elsevier Ltd. All rights reserved.

DOI10.1016/j.phystochem.2005.09.006
Funding Agency

Council of Scientific & Industrial Research (CSIR) - India

Type of Journal (Indian or Foreign)

Foreign

Impact Factor (IF)

2.778

Divison category: 
Biochemical Sciences