水稻品种对石灰性土壤缺Zn耐性机理的研究
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* 国家自然科学基金(批准号39570416)


STUDY ON MECHANISMS OF RICE CULTIVARS ADAPTATION TO ZINC DEFICIENCY IN CALCAREOUS SOIL
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    摘要:

    选用缺Zn敏感水稻品种IR26和耐缺Zn水稻品种IR8192-31-2,采用营养液培养的方法,研究了水稻品种耐石灰性土壤缺Zn与HCO3-关系的生理生化机制。在低锌浓度下,HCO3-严重抑制敏感品种根系生长,而对耐性品种影响很小;HCO3-增加了两种水稻品种根中的苹果酸和柠檬酸浓度,但敏感品种增加的幅度大。以上结果表明HCO3-对敏感品种根生长的抑制,并诱发缺Zn是由于根中有机酸过度积累导致的,HCO3-显着提高敏感品种根中PEP羧化酶活性可能是HCO3-增加其有机酸积累,从而影响根生长及Zn有效性机理的重要过程。

    Abstract:

    Solution culture experiments were conducted using the Zn-inefficient cultivar IR26 and the Zn-efficient cultivar IR8192-31-2 to study on physiological and biochemical mechanisms of rice plant adaptation to Zn deficiency with relation to bicarbonate tolerance. The results showed Bicarbonate strongly inhibited root growth of Zn-inefficient cultivar especially at low Zn concentration. In contrast, it had little effect on the root growth of Zn-fficient culrivar. Bicarbonate increased the concentrations of malate and citrate in the roots of both cultivars, but to greater extent for the Zn-inefficient than for the Zn-efficient cultivars. The results implied that the inhibitory effect of bicarbonate on root growth of the Zn-inefficient cultivar might result from high accumulation of organic acids in the root cells. PEP-case is a key enzyme for the synthesis of organic acid, so it was concluded that increase of organic acid by bicarbonate resulted from increase of PEP-case activity.

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徐晓燕,杨肖娥,杨玉爱.水稻品种对石灰性土壤缺Zn耐性机理的研究[J].土壤学报,2000,37(3):396-401. DOI:10.11766/trxb199908250314 Xu Xiao-yan, Yang Xiao-e, Yang Yu-ai. STUDY ON MECHANISMS OF RICE CULTIVARS ADAPTATION TO ZINC DEFICIENCY IN CALCAREOUS SOIL[J]. Acta Pedologica Sinica,2000,37(3):396-401.

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  • 收稿日期:1999-08-25
  • 最后修改日期:1999-11-30
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  • 在线发布日期: 2013-02-25
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