Issue Archive

The effects of Ca~(2+)-or K~(+)-deprivation in the nutrient solutious on drought resistance of broomcorn millet seedlings

Song Kemin, Yao Guangyun, Zhang Zhiliang, Shen Zengyou, Yan Jiqiong

Department of Biology, East China Normal University. Shanghai 200062

Abstract

The relative wate content (RWC) of the seedlings grown in all foru nutrient solutions decrease under water stress while the permeability increased. It was also found that, under water stress, K~(+)--deprivation and Ca~(2+)--and K~(+)--deprivation led to larger decrease of RWC in the seedlings than complete and Ca~(2+)--free nutrient solutions; Ca~(2+)--deprivation caused larger increase of permeability. Under water stress, the free proline content of the seedlings grown in complete nutrient solution was much higher than that of the control. but that of the seedlings grown in other three nutrient solutions showed no obvious difference form their respective contols. In addition, plasmolyss and damage of chloroplast coocurred in the mesophyll cells of the leaves of the seedlings grown in K~(+)--free or Ca~(2+)--and K~(+)--free solution under water stress for 48h; K~(+)--deprivation damaged the ultrastructure of the seedling leaves more severely than Ca~(2+)--deprivation. these results indicated that Ca~(2+)--and, especially, K~(+)may play important roles in drought resistance of broomcron millet seedlings.

Key words: Broomcorn millet (Panicum miliaceum);Water sirers;Calcium potassium; Chlorpromazine;Drought resistance;

Received: 　　Accepted:

Corresponding author: 　　E-mail:

Citing This Article：

Song Kemin, Yao Guangyun, Zhang Zhiliang, Shen Zengyou, Yan Jiqiong. The effects of Ca~(2+)-or K~(+)-deprivation in the nutrient solutious on drought resistance of broomcorn millet seedlings. Acta Physiol Sin 1995; 47 (1): (in Chinese with English abstract).