不同株高粳稻氮素累积和转运的基因型差异

以矮秆粳稻4007、武运粳和高秆粳稻豫粳和云粳为材料，研究了不同株高水稻累积和转运氮素的基闪型差异。结果表明，4007和武运粳的产量显著高于豫粳和云粳。矮秆粳稻4007和武运粳在分蘖期累积的氮素量低于豫粳和云粳，开花期后吸收的氮素显著高于豫粳和云粳。矮秆粳稻转运到籽粒中的氮素转运量和转运率以及籽粒氮素产量均显著高于高秆粳稻，而成熟时残留在茎叶中的氮素低于高秆粳稻。上述结果表明，种植矮秆粳稻更有利于水稻高产和提高氮素的利用效率。

Genotypic variation of nitrogen accumulation and translocation in japonica rice (Oryza sativa L.) cultivars with different height

Field experiments were conducted to assess nitrogen accumulation and translocation in japonica cultivars with different height and to evaluate their relation to grain yield.Four rice cultivars,4007 and Wuyunjing(short-height type)and Yujing and Yunjing(tall-height type),were grown at two sites in 2004.Short-height cultivars had significantly higher grain yields compared to tall-height cultivars.Less nitrogen was accumulated in short-height cultivars than in tall-height cultivars during tillering stage,but the reverse was true after anthesis.Besides,more nitrogen was translocated to grain and thus less nitrogen was remained in straw at maturity in short-height cultivars as compared with tall-height cultivars.These results suggest that cultivation of the rice cultivars with short-height cultivars is a way to increase nitrogen use efficiency by rice plants and thus to increase the rice grain yields.