高温胁迫下21个山茶种质的生理生化响应

为给山茶属植物的资源评价及进一步开发利用提供科学依据,以21个山茶种质为材料,研究了高温胁迫条件下的相对电导率、叶绿素含量、丙二醛含量和SOD活性变化情况。结果表明,随着温度的升高,21个山茶种质的相对电导率升高,且呈"S"型曲线,XSC14等5个种质的半致死高温均达60℃以上。高温胁迫促使21个山茶种质的叶绿素含量均有不同程度的下降。结合MDA含量和SOD活性测定结果,发现XSC20、XSC14耐热性较强,而XSC4耐热性较差。

Physiological and biochemical responses of 21 Camellia germplasms to high temperature stress

In order to provide scientific basis for resources evaluation and further exploitation of Camellia genus plants, using 21 Camellia germplasms as experiment materials, changes of relative electrical conductivity, chlorophyll content, MDA content and SOD activity were studied under high temperature stress. The results showed that relative electric conductivity of 21 Camellia germplasms were increased with the rise of treated temperature, and presented “S” curve. The semilethal temperatures of 5 Camellia germplasms including XSC14 were over 60 ℃ . Chlorophyll contents in 21 Camellia germplasm were decreased under the condition of high temperature stress. XSC20 and XSC14 were more stronger heat resistance than the others, and the heat resistance of XSC4 was poorer.