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Differential Inhibition of Helicoverpa armigera (Hubner) Gut Proteinases by Proteinase Inhibitors of Okra and Its Wild Relatives

机译:秋葵及其野生亲缘动物的蛋白酶抑制剂对棉铃虫肠道蛋白酶的不同抑制作用

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摘要

The seeds of ten genotypes and twenty-nine wild relatives of okra were analysed for the presence of trypsin, chymotrypsin, and Helicoverpa gut proteinases (HGPs) inhibitors (HGPIs), with the aim to identify potent inhibitors of H. armigera gut proteinases. Proteinase inhibitors (PIs) obtained from wild relatives of okra exhibited stronger inhibition of HGPs than the genotypes of okra. In in vitro inhibitory assay against HGPs, A. tuberculatus 90396 and 90515 showed high tryptic inhibitory (71.8% and 69.2%), chymotryptic inhibitory (68.5% and 66.2%), and Helicoverpa gut proteinase activity (70.2% and 68.2%). In electrophoretic profile showed the same variation in the number of trypsin inhibitors (TIs), chymotrypsin Inhibitors (CIs), and HGPIs isoforms with different intensities, whereas genotypes of okra mostly showed monomorphic profile. Maximum eight HGPIs isoforms were found in A. tuberculatus (90396 and 90515). In bioassay studies, significant reduction in weight of H. armigera larvae was found, when larvae fed on PIs obtained from A. tuberculatus (90396 and 90515). Thus, the result of the present investigation indicates that further exploration of PIs obtained from A. tuberculatus (90396 and 90515) will be helpful for developing PIs-based insect resistance management strategies.
机译:分析了10个基因型和29个秋葵野生亲属的种子中是否存在胰蛋白酶,胰凝乳蛋白酶和Helicoverpa肠蛋白酶(HGPs)抑制剂(HGPI),以鉴定棉铃虫肠蛋白酶的有效抑制剂。从秋葵的野生近缘种获得的蛋白酶抑制剂(PIs)对HGP的抑制作用比秋葵的基因型强。在针对HGP的体外抑制分析中,结核杆菌90396和90515显示出较高的胰蛋白酶抑制作用(71.8%和69.2%),胰凝乳蛋白酶抑制作用(68.5%和66.2%)和Helicoverpa肠蛋白酶活性(70.2%和68.2%)。电泳图谱显示强度不同的胰蛋白酶抑制剂(TIs),胰凝乳蛋白酶抑制剂(CIs)和HGPIs亚型的数量相同,而秋葵的基因型大多表现出单态性。在结核曲霉中发现最多八种HGPIs亚型(90396和90515)。在生物测定研究中,当将幼虫喂食从结核曲霉获得的PI时,发现棉铃虫幼虫的重量显着减少(90396和90515)。因此,本研究的结果表明,进一步研究从结核曲霉(90396和90515)获得的PI有助于开发基于PI的昆虫抗性管理策略。

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