Abstract:

Six middle-season indica hybrid rice combinations(Shanyou 63 as CK) were used as experimental materials to study dry matter production characteristics of super hybrid rice.There were great advantages for super rice in dry matter production and accumulation and its yield rose as the increase of dry matter accumulation.Grain yield was not significantly correlated with dry matter accumulation before elongation stage,while significantly positively correlated(P<0.05) from elongation to heading stage and significantly positively correlated(P<0.01) from heading to maturity stage.There were more dry matter in vegetative organs at the heading stage in super rice but its contribution to yield was less than 148.5 kg/hm2 averagely(apparent translocation percentage was 2.5% lower than that of the control Shanyou 63).Along with the increase in leaf area index and leaf area duration,the crop growth rate rose.The mean of crop growth rate in super rice was 4542(m2·d)/hm2,higher than that of CK after transplanting.

Key words: super rice, dry matter production, crop growth rate, leaf area duration, leaf area index, net assimilation rate

摘要： 以具代表性的5个籼型超级稻为材料, 用汕优63作对照, 比较研究了超级中籼杂交稻物质生产与分配的特性。 超级稻具有显著的物质生产与积累优势, 产量随成熟期物质积累量的增加而提高。 超级稻的物质生产优势集中在中期和后期, 产量与拔节前的干物质积累量相关不显著, 与拔节至抽穗期的积累量呈显著正相关, 与抽穗至成熟期的干物质积累量呈极显著正相关; 超级稻抽穗期营养器官贮存了较多的结构物质但干物质表观输出量均低于对照, 平均少148.5 kg/hm2, 表观输出率也低, 平均低2.5个百分点。 超级稻的叶面积及光合势的显著提高促进了群体生产率的提高, 大田期平均群体生产率比对照高4542 (m2·d)/hm2。

关键词: 超级稻, 物质生产, 作物生长率, 光合势, 叶面积指数