【摘要】 在大田条件下,比较研究超级稻Ⅲ优98和高产中粳80优121的产量构成与物质生产特性。结果表明:与中粳80优121相比,超级稻Ⅲ优98显著增产,增产原因是在适宜的单位面积穗数的基础上,通过增大穗型而显著增加颖花量,同时提高结实率,从而弥补较低的千粒重对产量的负影响。对光合生产性状比较研究表明:超级稻Ⅲ优98中、后期具有较明显的叶面积指数(LA I)优势,孕穗期的最大绿叶面积大,花后下降慢,群体光合势(LAD)强,而净同化率(NAR)并未因中后期LA I的增大而线性下降,这使得超级稻Ⅲ优98中、后期群体生长率(CGR)优于对照,提高了中、后期的物质积累量而提高群体总生物产量。在株型上超级稻Ⅲ优98还具有单茎茎鞘重的优势。更多还原

【Abstract】 The character of the yield and its components and the biomass production between super rice ⅢYou 98 and 80You121(middle-season japonica hybrid) was compared in field.In yield,the results showed that ⅢYou98 was significantly higher than 80You121.The reason was that total amount of spikelets increased notably based on suitable panicles though enlarging the panicle type,and at the same time the increased seed setting decreased the effect of the low weight of 1000-grains.ⅢYou 98 had obvious superiority in LAI in the middle and later periods,which was largest in the booting stage and dropped slowly after the flowering.So the population leaf area duration (LAD) was bigger.And larger LAI did not affect the net assimilation rate (NAR),which increased the crop growth rate(CGR) of super rice ⅢYou 98,and increased the total amount of population dry matters.ⅢYou 98 also had heavier culms and sheath.更多还原