• 关键词：空气污染  SO₂  粘虫  小麦  水解氨基酸

• 基金项目：国家自然科学基金

• 吴坤君
• 中国科学院动物研究所,北京

• 龚佩瑜
• 中国科学院动物研究所,北京

• 李秀珍
• 中国科学院动物研究所,北京

• 舒俭民
• 中国环境科学研究院,北京

• 曹洪法
• 中国环境科学研究院,北京

• 摘要：将3龄幼虫接种在暴露于低浓度SO₂的小麦植株上自由取食12d,研究SO₂污染对粘虫生长的影响;对照组小麦用经过活性炭过滤的空气处理。结果表明,随着SO₂浓度升高,幼虫历期逐渐缩短,幼虫期的平均相对生长速率依次增大。用人工饲料进行的类似试验结果,排除了SO₂污染直接促进粘虫生长的可能性。根据对食料植物水解氨基酸含量的测定结果,可以假设在非污染条件下生长的麦叶中,蛋氨酸和精氨酸含量偏低使粘虫处于亚最适生长状态,SO

• Abstract：Effects of SO₂ on larval performance of army worm, Mythimna separata (Walker) were investigated by allowing the 3rd-instar-old worms to freely feed for 12 days on wheat plants exposed to SO₂ (50-200ppb) in field open-top fumigation chambers. Larval period was shortened while their mean relative growth rate (MRGR) became greater as SO₂ concentration elevated. Similar experiments conducted with insects and artificial diet excluded the possibility of increased larval growth due to SO₂ direct effect. Measurement of amino acid hydrolysate in food plant suggested that the contents of methio-nine, and perhaps arginine, in wheat foliage grew in clear air were at such levels that they could only support sub-optimum growth, and the additional SO₂ increased concentrations of these limiting amino acids in host plant, resulting in optimum performance of the larvae.

• Key words：air pollution  SO₂  Wheat  amino acids  army worm

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