Cadmium and zinc induced chlorosis in Indian mustard [Brassica juncea (L.) Czern] involves preferential loss of chlorophyll b

被引:62
作者
Ebbs, S. [1 ]
Uchil, S. [1 ]
机构
[1] So Illinois Univ, Dept Plant Biol, Carbondale, IL 62901 USA
关键词
heavy metals;
D O I
10.1007/s11099-008-0010-3
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Plants of Indian mustard (Brassica juncea) were treated with either 50 mu M Cd, 250 mu M Zn, or 25 mu M Cd+125 mu M Zn and the progression of chlorosis in the mature leaves monitored. As relative chlorophyll (Chl) contents in the mature leaves decreased to 75, 50, and 25 % relative to controls, both mature and young leaves were harvested and the Chl pools extracted. The metal treatments caused a greater loss of Chl b than Chl a. As mature leaves underwent progressive chlorosis, the young leaves displayed a characteristic over-greening, due largely to increased content of Chl b. However, as the young leaves began to experience chlorosis, a greater loss of Chl b was also observed. Thus during metal induced chlorosis, there is a preferential turnover of the Chl b pool in mature and young leaves.
引用
收藏
页码:49 / 55
页数:7
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