高温胁迫对春兰耐热性相关生理指标的影响

高温是非常严重的环境灾害因子之一,严重影响着春兰等花卉的生长。通过光照培养箱模拟温室条件下的高温胁迫对春兰进行试验,探讨叶片脯氨酸、丙二醛、可溶性糖以及叶绿素含量的变化,以期了解高温胁迫下春兰叶片的某些生理变化,为选择春兰耐热性指标提供理论依据。结果表明,温度的升高能诱导植物体内可溶性糖的积累,使丙二醛(MDA)含量和脯氨酸含量增加,而加速了叶绿素分解,导致叶绿素含量明显下降;通过方差分析,42℃下春兰叶片的可溶性糖、脯氨酸和丙二醛含量显著高于常温,且可溶性糖、脯氨酸含量的变化达到了极显著水平(P<0.01),而叶绿素含量与之相反,显著低于常温。

Influence of Physiological Indexes of Heat Tolerance under High Temperature Stress in Cymbidium goeringii

High temperature affects the growth of Cymbidium goeringii as one of the very serious environmental disasters. The experiment studied on the changes of Cymbidium goeringii physiological indexes by measuring the leaf proline, malondialdehyde, soluble sugar and chlorophyll content under high temperature stress. The results indicate that temperature rise could induce the accumulation of soluble sugar in plants, increase malondialdehyde （ MDA ） and proline content, and accelerate the decomposition of chlorophyll, result in decline in chlorophyll content significantly. The soluble sugar, proline and malondialdehyde content in 42℃ rised significantly compared with the contents in 25℃ by variance analysis（P〈 0.01 ）. While chlorophyll content was significantly lower than that of the control.