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作 者 ：陈光才1;王人民2;李迎春3;杨肖娥4

期 刊 ：植物营养与肥料学报 2004年 10卷 5期 页码：526-530

关键词：水稻基因型；锌离子活度；耐低锌；子粒富锌；

Keywords:Genotype of rice, Zn2+ activity, Zn-efficient, Zn-dense in grain,

摘 要 ：采用卜HEDTA螯合缓冲营养液,在4个锌水平(pZn²⁺即-log[Zn²⁺])分别为11.4、11.0、10.3和9.7下对锌营养效率不同的4个水稻基因型[IR8192、IR26、BY(碧玉早糯)、Z921(浙农921)]进行营养液培养试验,研究水稻幼苗对Zn吸收、转运和利用规律。结果表明,随着锌离子活度下降,各水稻基因型的锌累积量下降,锌从地下部向地上部的转运率提高,锌利用效率提高,且各基因型间差异显著。在锌离子活度较低时,耐低锌基因型(IR8192)锌养分利用效率和提高养分利用率的能力要远远高于锌敏感基因型IR26和子粒富锌基因型BY;在锌离子活度较高时,水稻子粒富锌基因型BY有较强的锌富集能力,具有较高的秧苗锌累积量,这可能是其子粒富锌的主要机理之一;利用苗期营养性状筛选子粒富锌水稻基因型效果可能较好。

Abstract:Four genotypes of rice (IR8192, IR26, BY and Z921) with different Zn-efficiency were cultivated in chelator buffered nutrient solution at four Zn levels (pZn²⁺ i. e. -log[Zn²⁺]) was 11.4,11.0,10.3,9.7, respectively to study the regulation of absorption, translocation and utilization of Zn at rice seedlings. As Zn²⁺ activity decreased, the amount of Zn uptake by rice seedlings decreased, while translocation rate of Zn from root to shoot, Zn utilization efficiency increased in all genotypes. There was obvious genotypic difference on changing range among four genotypes. At low Zn activity, Zn-efficient rice genotype (IR8192) was stronger in utilization efficiency of Zn and promoting the efficiency than Zn-inefficient(IR26) and Zn-dense in grain rice genotype (BY). At high Zn²⁺ activity, Zn-dense in grain genotype was stronger in Zn-uptake and accumulation in rice plant, maybe was one of the mechanisms of Zn-dense in grain genotype. It also could be concluded that nutrient traits of rice seedlings, such as total Zn uptake and accumulation in rice plant and could be used in screening Zn-dense in grain genotypes.

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