Tannins in Resistance to Bruchid, Callosobruchus maculatus Fab. (Bruchidae: Coleoptera)
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Author:T. Srinivasan, C. Durairaj and P. Sakthivel
p-ISSN:0024-9602, e-ISSN:2582-5321, Vol:99, Issue:jul-sep
DOI: https://doi.org/10.29321/MAJ.10.100156
Abstract
Cultivated Vigna radiata accessions, wild Vigna umbellata accessions and non-edible
leguminous seeds were evaluated for their resistance to the bruchid, Callosobruchus
maculatus and the possibility of using them as resistant donors. All the seeds except
Leucaena leucocephala were susceptible to oviposition by bruchids. But V. radiata accessions
supported normal emergence of bruchids while V. umbellata accessions terminated their
development at different larval instars. The tannin content of V. umbellata accessions was
also significantly higher (2.48 to 4.24 mg/g) when compared to V. radiata accessions (1.66 to
2.14 mg/g). In the case of non-edible legumes, development of bruchids was arrested at the
seed coat itself while the first instar grubs were about to penetrate seed coat. Hence seed
coat tannin content of non-edible legumes was estimated which was the highest (4.13 to
13.02 mg/g) compared to other groups of legumes.
Key words : Vigna radiata, Vigna umbellata, non-edible legumes, tannins, bruchid resistance