【摘要】 通过田间试验研究了不同供磷水平对8个水稻品种磷素吸收利用和稻谷产量的影响。研究结果表明,两种供磷水平下,水稻的稻谷产量、磷利用效率和各生育期地上部磷积累都存在显著的基因型差异。低磷胁迫显著降低水稻的稻谷产量和各生育期地上部磷积累,显著提高水稻的磷利用效率。相关性分析表明,低磷胁迫下水稻稻谷产量与水稻磷利用效率、生育前期(秧苗期+分蘖期)地上部磷积累以及生育中期(抽穗期)地上部磷积累呈显著正相关(p<0. 05);正常供磷条件下水稻稻谷产量与磷利用效率、生育前期地上部磷积累呈显著正相关(p<0. 05)。因此筛选和培育具有较高磷利用效率和在生育前期具有较强磷素积累特性的水稻基因型可能是缓解南方水稻土磷素严重缺乏的有效途径之一。更多还原

【Abstract】 A field trial was carried out to study the effect of different P supply on the grain yield and P acquisition through utilization of eight rice cultivars. Results showed that there were significantly genotypic variations in rice grain yield, P utilization efficiency and shoot P accumulation at different growth stage under two different levels of P supply. Compared with normal P supply, rice grain yield and shoot P accumulation decreased and P utilization efficiency increased under low P supply. Correlation analysis showed that rice grain yield positively correlated with P utilization efficiency, shoot P accumulation of both growth early stage and growth mid-stage (p<0.05)under low P supply ,while rice grain yield was positively correlated with P utilization efficiency and shoot P accumulation of growth early stage (p<0.05)under normal P supply.Therefore, screening and breeding rice genotypes with higher P utilization efficiency and higher ability to accumulate P at the early stage of grouth would probably be one of the alternatives to alleviate the P deficiency of paddy soil in south of China.更多还原