Effects of sodium chloride on foliar ultrastructure of sweet potato (Ipomoea batatas Lam.) plantlets grown under light and dark conditions in vitro

被引:83
作者
Mitsuya, S [1 ]
Takeoka, Y [1 ]
Miyake, H [1 ]
机构
[1] Nagoya Univ, Grad Sch Bioagr Sci, Nagoya, Aichi 4648601, Japan
关键词
Ipomoea batatas Lam; cell organelles; in vitro; oxidative stress; thylakoid membrane; transmission electron microscopy; ultrastructure; vacuole;
D O I
10.1016/S0176-1617(00)80009-7
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The effects of sodium chloride on foliar ultrastructure of sweet potato plantlets grown under light and dark conditions in vitro were examined. Ultrastructural changes induced by salt stress under light conditions occurred in the following order: (1) vacuolation, development and partial swelling of ER; (2) decrease in mitochondrial cristae and swelling of mitochondria, with an increase of the vesicles released from the Golgi stacks; (3) vesiculation and fragmentation of tonoplast; and (4) degradation of cytoplasm by the mixture of cytoplasmic and vacuolar matrices. In the mesophyll, thylakoid membranes of chloroplasts were swollen and most were lost following severe salt stress. Under dark condition, however, inner membranes of etioplasts maintained their ultrastructural integrity. The present study suggests that degradation of cytoplasm and cell organelles, except thylakoid membranes of chloroplast, occurred as a result of light-independent salt stress, and degradation of thylakoid membranes of chloroplast in the mesophyll occurred as a result of salt-induced oxidative stress.
引用
收藏
页码:661 / 667
页数:7
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