DIFFERENT CHARACTERISTICS OF ROOTS IN THE CADMIUM-TOLERANCE AND CD-BINDING COMPLEX-FORMATION BETWEEN MONOCOTYLEDONOUS AND DICOTYLEDONOUS PLANTS

被引:60
作者
INOUHE, M
NINOMIYA, S
TOHOYAMA, H
JOHO, M
MURAYAMA, T
机构
[1] Department of Biology, Faculty of Science, Ehime University, Matsuyama
关键词
CD-BINDING COMPLEX; CD-TOLERANCE OF ROOTS; GLUTATHIONE; MONOCOTYLEDONOUS AND DICOTYLEDONOUS PLANTS; PHYTOCHELATIN;
D O I
10.1007/BF02344245
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Effects of Cd2+ on growth and Cd-binding complex formation in roots were examined with various seedlings of mono- and dicotyledonous plants. Maize, oat, barley and rice exhibited the greater tolerance to Cd2+ (100 muM) than did azuki bean, cucumber, lettuce, pea, radish, sesame and tomato (10-30 muM). Azuki bean was the most sensitive of Cd2+ (<10 muM). Under these Cd-treatments, cereal roots accumulated Cd2+ in the cytoplasmic fractions and transported Cd2+ into the same fractions of shoot tissues, to larger extents than did dicotyledonous roots. Cereal roots synthesized a Cd-binding complex containing phytochelatins in the cytoplasmic fractions, depending upon Cd2+ concentrations applied (30-100 muM). Such a complex was not detected from the same fractions of dicotyledonous roots treated with Cd2+. These results suggest that the Cd-binding complex formation has an important role in the tolerance of cereal roots against Cd2+.
引用
收藏
页码:201 / 207
页数:7
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