遮荫对不同杂交稻组合叶片渗透调节物质含量及保护酶活性的影响

摘要

Effects of shading at flowering and grain filling stages on osmotic regulation substance contents and activities of protective enzymes in leaves of different hybrid rice combinations were investigated by using II you 498, Gangyou 188. Dcxiang -4103. Gangyou 527 and Chuanxiang 9838 as test malt-rials. The results showed thai the content of malondialdchyde of Gangyou 188 was significantly increased under shading, whereas the content of malondialdehyde of you 198. Dexiang 1103. Gangyou 527 and Chuanxiang 9838 had insignificant difference compared to the control. The content of soluble sugar was significantly decreased in II you 198. Gangyou 188. Dexiang 4 103 and Chuanxiang 9838 under shading. However, the content of souble sugar was not significantly increased in Gangyou 527 under shading. The content of soluble protein in the leaves of different hybrid rice combinations tended to decrease under shading. The activities of protective enzymes in leaves varied among different hybrid rice combinations under shading. Taking both the contents of osmotic regulation substances and the activities of protective enzymes in rice leaves into consideration. Gangyou 188 and Gangyou 527 had strong ability to adapt themselves to weak light conditions. The damage mechanism of leaves of different hybrid rice combinations under shading was discussed.%以Ⅱ优498、冈优188、德香4103、冈优527和川香9838为材料,研究了开花及灌浆结实期遮荫对不同杂交稻组合叶片渗透调节物质含量及保护酶活性的影响.结果表明,遮荫使冈优188丙二醛含量显著增加,Ⅱ优498、德香4103、冈优527和川香9838丙二醛含量遮荫处理与对照的差异不显著；遮荫使冈优188、德香4103和川香9838可溶性糖含量显著或极显著降低,冈优527可溶性糖含量增加,但差异没有达到显著水平；遮荫处理使不同杂交稻组合可溶性蛋白含量均降低；遮荫对不同杂交稻组合叶片保护酶活性影响存在差异.综合渗透调节物质含量和保护酶活性,冈优188和冈优527对弱光具有较强的适应和调节能力.讨论了遮荫对不同基因型杂交稻叶片伤害机理.