品种更替对中熟粳稻磷吸收的影响

Effects of Alternation of Varieties on the Phosphorus Absorption of Mid-season Japonica Rice

[目的]研究品种更替对中熟粳稻磷吸收的影响。[方法]以江苏省各年代有代表性的品种为材料,研究植株磷吸收在品种更替过程中的变化规律。[结果]各主要生育期植株磷累积量均表现为现代品种显著或极显著高于早期品种。各类型品种磷累积均主要集中在拔节期—抽穗期,且磷吸收的比例随品种更替呈不断增加的趋势。早期品种在成熟期仍有大量的磷残留在茎鞘中;而现代品种,尤其是杂交稻的营养物质向籽粒的运转率相对较高。[结论]该研究可为高产、超高产育种和栽培提供依据。

[ Objective] To research the effects of alternation of varieties on the phosphorus absorption of mid-season Japonica rice. [ Method] With representative varieties of Jiangsu Province as research materials, we researched the change laws of plant phosphorus absorption in the process of varieties alternation. [ Result] The accumulation of phosphorus in the main growth stages was significantly or extremely significantly higher than that in the early varieties. The accumulation of phosphorus in all kinds of varieties was mainly concentrated at jointing stage-head-ing stage, and the proportion of phosphorus absorption in this stage showed a rising trend with the alternation of varieties. There were still a large number of phosphorus residues in the stem and sheath in the early generations. But in the modem varieties, especially in hybrid rice, the running rate of the nutrients to the grain was relatively high. [ Conclusion] This research provides references for the high-yield and super-high- yield breeding and cultivation.