| 摘要: |
| 为了筛选磷高效基因型水稻种质,以14个不同基因型水稻为供试材料,对低磷和正常供磷处理下水稻分蘖期的生物学性状、磷的吸收利用效率、成熟期产量及其产量构成因素的差异进行了研究。结果表明,低磷胁迫明显影响水稻的生长,分蘖期的株高、分蘖数、干物质量、磷吸收效率、单株产量分别低于正常供磷处理5.9～14.5cm,4.5～14.8,2.15～7.53 g/株,5.35～14.46 mg/株,0.5～13.4 g,而根冠比和磷利用效率分别高于正常供磷处理0.01～0.08,133.8～416.4 g/g,且不同基因型水稻间差异显著。说明筛选具有较高磷吸收利用效率和较高产量的水稻种质是可行的。 |
| 关键词: 水稻 磷营养 吸收效率 利用效率 |
| DOI： |
| 分类号: |
| 基金项目:广东省“十五”重大科技专项(2002A2040902) |
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| Studies on differences in phosphorus nutrition of rice genotypes |
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| Abstract: |
| Under the low P and normal P supply,fourteen rice genotypes were selected to study the differences in biological characters,P uptake and utilization efficiency at tillering stage,together with the grain yield and the yield components at maturity in order to screen rice genotypes with higher P efficiency.Results showed that there were significant genotypic differences in shoot height,tillers,dry weigh,P uptake efficiency,P utilization efficiency and rice grain yield under low P supply.Compared with normal P supply,shoot height,tillers,dry weigh,P uptake efficiency and rice grain yield decreased by 5.9-14.5 cm,4.5-14.8,2.15-7.53 g/plant,5.35-14.46 mg/plant,0.5-13.4 g,respectively,but ratio of root to shoot and P utilization efficiency increased by 0.01-0.08 and 133.8-416.4 g/g under low P supply,respectively,which indicated that screening rice genotypes with higher P uptake utilization efficiency and higher grain yield was feasible. |
| Key words: rice,P nutrition,uptake efficiency,utilization efficiency |
