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选用缺 Zn敏感水稻品种 IR2 6和耐缺 Zn水稻品种 IR8192 - 31- 2 ,采用营养液培养方法 ,研究了缺 Zn敏感和耐性水稻品种根生长和根区主要有机酸分布受 HCO-3 影响的差异。在低锌浓度下 ,HCO-3 严重抑制敏感品种根系生长 ,而对耐性品种影响很小 ;苹果酸在敏感品种根区的分布情况是伸长区 >分生区 >根毛区 ,而在耐性品种根区的分布情况是伸长区和分生区浓度相近 ,但均高于根毛区。敏感品种和耐性品种根的分生区中苹果酸浓度相近 ,而敏感品种伸长区苹果酸的浓度明显高于耐性品种。柠檬酸在两种水稻品种根中的分布情况是伸长区 >分生区和根毛区 ,并且柠檬酸在敏感品种根区各部位积累浓度均高于耐性品种。以上结果表明 HCO-3 对根生长抑制敏感区域是根的伸长区 ,水稻品种对缺 Zn敏感性表现不同与根中有机酸分布不同有关
Using Zn2-deficient rice variety IR2 6 and Zn-tolerant rice variety IR8192 - 31-2, the effects of HCO-3 on root growth and root distribution of Zn-deficient and resistant rice cultivars were studied by nutrient solution culture difference. At low Zn concentrations, HCO-3 significantly inhibited the root growth of susceptible cultivars, but had little effect on tolerant cultivars. The distribution of malic acid in the root zone of susceptible cultivars was in the elongation zone> meiosis zone> The distribution of root zone is similar in the elongation zone and meiosis zone but higher than the root hair zone. The concentrations of malic acid in the shoots of sensitive and tolerant cultivars were similar, but that of susceptible cultivars was significantly higher than that of the resistant cultivars. The distribution of citric acid in the roots of two rice cultivars was the elongation zone> meiosis zone and root hair zone, and the concentration of citric acid in all parts of the root zone of the susceptible variety was higher than that of the tolerance variety. The above results showed that HCO-3 was the root elongation region of root growth inhibition. The sensitivity of rice varieties to Zn deficiency was different from the distribution of organic acids in roots