细胞原生质层的透性测定法

一个正常的完全生长的植物细胞,具有大的中央液泡,原生质占细胞体积的5％,是质膜与液泡膜之间的一个薄层。原生质与质膜和液泡膜合称为原生质层。它是液泡和外界溶液进行物质交换的屏障,非电解质从外界溶液进入液泡主要依赖于扩散过程,即被动透性。原生质层对非电解质的透性大小表示原生质层对液体或处于溶解状态物质的通透能力,是原生质层的一个特性。通过原生质层透性大小的测定,可以获得有关膜的组成,

Research on drought and chilling resistance in wheat and maize

The results indicate that high protoplast quality corresponds to high stress tolerance. The damage of cell membrane is one of the important mechanisms of stress. The protective enzyme system(superoxide dismutase.peroxidase and catalase) plays an important role in stress tolerance. In the research of hormone it is suggested that ABA can induce chilling torlerance, and the mechanism may correlate with the special gene expression.