African Journal of Biochemistry Research
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Article Number - 423333761366


Vol.10(6), pp. 38-46 , October 2016
DOI: 10.5897/AJBR2016.0899
ISSN: 1996-0778



Full Length Research Paper

Protease inhibition in cowpea pod-sucking bug species (Hemiptera: Heteroptera) using cereal and legume grain extracts



Abiola Elfrida Taiwo
  • Abiola Elfrida Taiwo
  • Department of Crop Production and Protection, Obafemi Awolowo University, Ile-Ife, Nigeria.
  • Google Scholar
Olalekan Joseph Soyelu*
  • Olalekan Joseph Soyelu*
  • Department of Crop Production and Protection, Obafemi Awolowo University, Ile-Ife, Nigeria.
  • Google Scholar
Raphael Emuebie Okonji
  • Raphael Emuebie Okonji
  • Department of Biochemistry, Obafemi Awolowo University, Ile-Ife, Nigeria.
  • Google Scholar







 Received: 29 July 2016  Accepted: 28 September 2016  Published: 31 October 2016

Copyright © 2016 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0


Selected grain extracts were assayed against digestive proteases of Anoplocnemis curvipes, Clavigralla tomentosicollis and Mirperus jaculus with a view to identifying suitable sources of protease inhibitors against the cowpea pests. Laboratory bioassays showed that grains of a local soybean variety Kìshí and a cowpea landrace NG/SA/07/0098 contain potent inhibitors although the former produced a consistently higher level of inhibition in each of the three pests. Protease activity was highest in C. tomentosicollis (1.06 μmol/mg) followed by M. jaculus (0.94 μmol/mg) and A. curvipes (0.69 μmol/mg) but inhibition was highest in M. jaculus. The optimum temperature range for the inhibitors was 40-90°C while optimum inhibitory activity occurred in weak acidic to neutral media, pH 4-7. There was total protease inhibition in the pests when soybean and cowpea extracts were combined against gut extracts in soybean-biased volumetric ratios of 0.7:0.3 and 0.8:0.2. This synergistic efficacy was superior to those of two commercial products. The inhibitors were stable for 10-50 min at 80°C but got denatured within few minutes of exposure to higher temperatures. Obtained results showed that the soybean and cowpea are suitable sources of protease inhibitors in breeding exercises for development of transgenic cowpea varieties.

Key words: Grain extract, optimum pH, optimum temperature, protease inhibition, thermostability, transgenic cowpea.

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APA Taiwo, A. E., Soyelu, O. J., & Okonji, R. E. (2016). Protease inhibition in cowpea pod-sucking bug species (Hemiptera: Heteroptera) using cereal and legume grain extracts. African Journal of Biochemistry Research , 10(6), 38-46.
Chicago Abiola Elfrida Taiwo, Olalekan Joseph Soyelu and Raphael Emuebie Okonji. "Protease inhibition in cowpea pod-sucking bug species (Hemiptera: Heteroptera) using cereal and legume grain extracts." African Journal of Biochemistry Research 10, no. 6 (2016): 38-46.
MLA Abiola Elfrida Taiwo, Olalekan Joseph Soyelu and Raphael Emuebie Okonji. "Protease inhibition in cowpea pod-sucking bug species (Hemiptera: Heteroptera) using cereal and legume grain extracts." African Journal of Biochemistry Research 10.6 (2016): 38-46.
   
DOI 10.5897/AJBR2016.0899
URL http://academicjournals.org/journal/AJBR/article-abstract/423333761366

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