Distribution of Na+ and Cl- in the roots of different rice genotypes under salt stress
1996
Zheng Shaoling (South China Agricultural Univ., Guangzhou (China). Laboratory of Plant Nutrition)
The X-ray microanalysis technique was employed to compare Na+ and Cl- distribution in the roots of six different rice genotypes which had similar general characters but marked differences in salt tolerance. Under NaCl stress, the content of Na+ in the stele parenchyma was relatively higher than in the other parts of the roots for the salt-tolerant genotypes, while the Na+ content was evenly distributed in the roots for the salt-sensitive genotypes, implying that the stele parenchyma might be the site controlling Na+ translocation from the root to the shoot. The Cl- distribution was relatively even across the roots of both salt-tolerant and salt-sensitive genotypes, suggesting that there might be other mechanisms controlling Cl- translocation
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