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Mechanism of Resistance to Helicoverpa armigera (Lepidoptera: Noctuidae) in Chickpea: Role of Oxalic Acid m Leaf Exudate as an Antibiotic Factor

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Title Mechanism of Resistance to Helicoverpa armigera (Lepidoptera: Noctuidae) in Chickpea: Role of Oxalic Acid m Leaf Exudate as an Antibiotic Factor
 
Creator Yoshida, M
Cowgill, S E
Wightman, J A
 
Subject Chickpea
 
Description Mechanisms of resistance to Helicoverpa armigera Hübner in chickpea, Cicer arietinum L., were investigated. Inhibition of larval growth occurred in a feeding test using the leaves of chickpea genotypes, which had previously been identified as having resistance to H. armigera. A feeding test using unwashed and washed leaves revealed that the substance responsible for the growth inhibition was water soluble and present on the surface of the leaves. Acid components of the leaf exudate were analyzed by high-performance liquid chromatography. Oxalic acid and malic acid were detected as major components in all 4 genotypes that were analyzed. Genotypes resistant to H. armigera accumulated more oxalic acid on the leaves than susceptible genotypes. Oxalic acid showed significant growth inhibition on H. armigera larvae when included in a semi-artificial diet. The accumulation of oxalic acid is considered to be one of the mechanisms of H. arnigera resistance in chickpea. Inhibition of larval growth by oxalic acid was not caused by antifeedant effects but was more likely attributable to antibiosis. Malic acid had no effect on larval growth.
 
Publisher Entomological Society of America
 
Date 1995
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/3322/1/JA_1734.pdf
Yoshida, M and Cowgill, S E and Wightman, J A (1995) Mechanism of Resistance to Helicoverpa armigera (Lepidoptera: Noctuidae) in Chickpea: Role of Oxalic Acid m Leaf Exudate as an Antibiotic Factor. Journal of Economic Entomology, 88 (6). pp. 1783-1786.