花铃期棉花对棉蚜刺吸胁迫的生理响应
Physiological responses of cotton to feeding by Aphis gossypii during the flowerbolling stage
邓小霞**,江海澜,彭俊,何泽敏,马天文,王俊刚***
点击：2068次 下载：23次
DOI：
作者单位：石河子大学农学院石河子832003
中文关键词：棉花， 棉蚜， 生理， 抗虫性
英文关键词：cotton aphid, physiology, insect resistance
中文摘要：
为了探索棉花对棉蚜Aphis gossypii Glover胁迫的抗性机理，利用分光光度计法测定了花铃期棉花经棉蚜刺吸后的生理指标。结果表明：在棉花花铃期，叶绿素含量在处理前期均有上升情况，仅在处理第10天后，蚜虫密度80头处理下的叶绿素含量显著低于对照；随着取食时间延长，各蚜虫密度下的可溶性蛋白含量均有所增加，并在处理10 d后，蚜虫密度80头处理下的可溶性蛋白含量显著比对照增加了78.38%；而游离脯氨酸、丙二醛含量随着取食时间增加呈先升后降的趋势，且在取食前期随着蚜虫密度增加，脯氨酸、丙二醛含量逐渐上升。由此可知，棉花能忍耐低密度蚜虫胁迫，而较高密度蚜虫刺吸初期敏感，随着胁迫时间延长，其自身防御能力增强.
英文摘要： In order to explore the mechanism by which cotton resists feeding by aphids, a spectrophotometer was used to measure physiological indices of cotton under attack by different densities of aphids. During the flowerbolling stage, although chlorophyll content first increased, the chlorophyll content of plants subject to attack by 80 aphids was significantly lower than that of control plants after 10 days. Soluble protein content increased under all aphid densities with duration of feeding time; that of plants subject to attack by 80 aphids was 7838% higher than that of control plants after 10 days. Free proline and MDA content first increased, then decreased, with feeding time and gradually increased with aphid density. In conclusion, cotton can withstand attack by a low density of aphids, but is sensitive to relatively high aphid densities. The plants’ defensive ability increases with time of exposure to aphid attack.