Internal Zinc Accumulation Is Correlated with Increased Growth in Rice Suspension Culture

被引:0
作者
B. Hossain
N. Hirata
Y. Nagatomo
R. Akashi
H. Takaki
机构
[1] Department of Biological Resource Science,
[2] Applied Genetics and Biotechnology Division,undefined
[3] Faculty of Agriculture,undefined
[4] Miyazaki University,undefined
[5] Miyazaki 889-21,undefined
[6] Japan,undefined
[7] Department of Developmental and Cell Biology,undefined
[8] University of California,undefined
[9] Irvine CA 92697-2300,undefined
[10] USA,undefined
来源
Journal of Plant Growth Regulation | 1997年 / 16卷
关键词
Key Words. Amino acid—Auxin—Oryza sativa—Rice—Zinc;
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摘要
A high zinc concentration of 520 μm, approximately 100 times that used most often in standard plant tissue culture media, was found to be superior in liquid callus cultures of japonica rice, increasing growth to 146% compared with standard N6 medium. At the same time, the internal zinc concentration increased 40 times in fast growing cells; soluble protein doubled, and free amino acids decreased. Under zinc-free conditions the cultures slowed in growth, and several free amino acids such as aspartic acid, glutamic acid, asparagine, and glutamine accumulated. We suggest that zinc acts as a direct regulatory factor in inducing auxin activity, but not auxin levels, making high internal zinc accumulation mandatory if high auxin concentrations are required as in rice callus cultures.
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页码:239 / 243
页数:4
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