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4种玉米水解肽的除草活性及与相对分子质量的关系

Herbicidal Activities of Corn Gluten Peptides Prepared by Different Proteases and Their Relations to Molecular Weight.
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摘要 以碱性蛋白酶、木瓜蛋白酶、风味蛋白酶和中性蛋白酶4种蛋白酶为水解酶制备玉米蛋白水解肽,用培养皿生物分析法检测在不同浓度(0.5、1.0、2.0和5.0 mg.mL-1)下的4种玉米蛋白水解肽对光鳞水蜈蚣(Kyllingabrevitoliavar.leiolepis)种子萌发过程中根系生长的抑制活性;采用超滤法制备相对分子质量不同的肽段并比较其除草活性。结果表明:不同浓度下的4种玉米蛋白水解肽对光鳞水蜈蚣种子萌发过程中根系生长均有抑制作用,且随着水解肽浓度的增高,其对根系生长的抑制活性增强;碱性蛋白酶、木瓜蛋白酶制备的玉米蛋白粉水解肽对根系生长的抑制活性明显高于风味蛋白酶和中性蛋白酶制备的玉米蛋白粉水解肽。相对分子质量不同的玉米蛋白粉水解肽对根系生长的抑制活性存在差异,5 000 u以下的小分子肽具有更高的抑制活性。 Corn gluten peptides were prepared by four different kinds of proteases and their respective root-inhibiting activities on smoothscale kyllinga (Kyllinga brevitolia var. leiolepis) were evaluated in Petri dish bioassay when they were 0.5,1.0,2.0 and 5.0 mg·mL^-1 in concentration. Results show that they all demonstrated root-inhibiting activity, which increased with their concentration. Herbicidal activities of peptides prepared by alcalase and Papain were significantly higher than those prepared by flavourzyme and neutrase. The peptides varied in bioactivity with molecular weight. Peptides small in molecular weight ( 〈 5 000 u) exhibited higher herbicidal activity than those large in molecular weight.
出处 《生态与农村环境学报》 CAS CSCD 北大核心 2006年第3期33-36,共4页 Journal of Ecology and Rural Environment
基金 广东省科技发展项目(03KJ6062)
关键词 蛋白酶 玉米蛋白粉 水解肽 根系 抑制活性 分子量 protease corn gluten peptide root inhibiting activity molecular weight
作者简介 杨剑(1965-),男,湖北罗田人,博士生,主要研究方向为杂草无公害控制及生物技术。
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