有哪些信誉好的足球投注网站a naturally occurring plant cysteine protease possesses remarkable toxicity against insect pests and synergizes bacillus thuringiensis toxin一种天然植物半胱氨酸蛋白酶具有显著的毒性对害虫和加强苏云金杆菌毒素.pdfVIP
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a naturally occurring plant cysteine protease possesses remarkable toxicity against insect pests and synergizes bacillus thuringiensis toxin一种天然植物半胱氨酸蛋白酶具有显著的毒性对害虫和加强苏云金杆菌毒素
A Naturally Occurring Plant Cysteine Protease Possesses
Remarkable Toxicity against Insect Pests and Synergizes
Bacillus thuringiensis Toxin
1 1 2 3
Srinidi Mohan , Peter W. K. Ma , W. Paul Williams , Dawn S. Luthe *
1 Department of Entomology, Mississippi State, Starkville, Mississippi, United States of America, 2 USDA-ARS Corn Host Plant Resistance Laboratory, Mississippi State,
Starkville, Mississippi, United States of America, 3 Department of Crop and Soil Sciences, The Pennsylvania State University, University Park, Pennsylvania, United States of
America
Abstract
When caterpillars feed on maize (Zea maize L.) lines with native resistance to several Lepidopteran pests, a defensive
cysteine protease, Mir1-CP, rapidly accumulates at the wound site. Mir1-CP has been shown to inhibit caterpillar growth in
vivo by attacking and permeabilizing the insect’s peritrophic matrix (PM), a structure that surrounds the food bolus, assists
in digestion and protects the midgut from microbes and toxins. PM permeabilization weakens the caterpillar defenses by
facilitating the movement of other insecticidal proteins in the diet to the midgut microvilli and thereby enhancing their
toxicity. To directly determine the toxicity of Mir1-CP, the purified recombinant enzyme was directly tested against four
economically significant Lepidopteran pests in bioassays. Mir1-CP LC50 values were 1.8, 3.6, 0.6, and 8.0 ppm for corn
earworm, tobacco budworm, fall armyworm and southwestern corn borer, respectively. These values were the same order
of magnitude as those determined for the Bacillus thuringiensis toxin Bt-CryIIA. In addition to being directly toxic to the
larvae, 60 ppb Mir1-CP synergized sublethal concentrations of Bt-CryIIA in all four species. Per
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