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首页> 外文期刊>Plant and Soil >Silicon deficiency and the adaptation of tropical rice ecotypes.
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Silicon deficiency and the adaptation of tropical rice ecotypes.

机译：硅缺乏和热带稻生态型的适应。

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Chemical analyses of soil, water and rice tissue samples from experiments on a typical weathered, acidic upland soil in Colombia found concentrations of Si which were 80-90% lower than those in a typical lowland environment. These results corroborate published findings from West Africa and Hawaii, and lend support to a conclusion that acid-soil upland rice environments in the tropics tend to be deficient in Si, increasing disease damage, among other effects. Critical values for diagnosis of Si deficiency in soils, water and rice husk tissue are suggested. These are reasonably consistent with previously published values derived from lowland rice studies, but extend their application to upland environments, and use simpler sampling and analysis methods. A strong correlation was found between high husk Si concentration and low husk discoloration caused by disease among diverse genotypes grown in the uplands. Genotypic differences were mainly explained by ecotypic affinities: tropical japonica ecotypes exhibited 93% higher husk Si concentrations than indica ecotypes (ecotypic means of 23 and 12 mg kg-1, respectively). This is consistent with a hypothesis that tropical japonica ecotypes may have adapted to Si deficiency in their native upland environment by evolving mechanisms to attain relatively higher tissue Si concentrations than indica ecotypes, which are believed to have evolved in the lowlands, where Si supply is generally sufficient.
机译：在哥伦比亚的典型风化酸性高地土壤上进行的实验对土壤，水和稻米组织样品进行化学分析，发现硅的含量比典型的低地环境低80-90％。这些结果证实了来自西非和夏威夷的已发表研究结果，并为以下结论提供了支持：热带地区的酸性土壤旱稻环境中的硅含量往往不足，从而增加了疾病危害，并带来其他影响。建议用于诊断土壤，水和稻壳组织中硅缺乏的临界值。这些与先前从低地水稻研究得出的值合理地一致，但是将其应用扩展到高地环境，并使用更简单的采样和分析方法。在旱地上生长的各种基因型之间，高稻壳硅浓度与低稻壳因疾病引起的变色之间存在很强的相关性。基因型差异主要由生态型亲和力来解释：热带粳稻生态型比hu稻生态型的壳硅浓度高93％（生态型平均值分别为23和12 mg kg-1）。这与一个假说相符，即热带粳稻生态型可能通过进化机制来获得比eco稻生态型更高的组织硅浓度，而mechanisms稻在本地旱地环境中已经适应了硅缺乏，in稻生态型被认为是在低地发展的，那里通常供应硅足够。

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