抽穗后光照强度对超级杂交稻干物质生产及氮素吸收与分配的影响  

Effects of Different Light Intensity after Heading Stage on Dry Matter Accumulation and Nitrogen Uptake and Distribution of Super Hybrid Rice

作　　者：秦建权[1] 唐启源[1] 李迪秦[1] 张运波[1] 李小勇[1] 杨胜海[1] 陈立军[1] 

机构地区：[1]湖南农业大学农学院,长沙410128

出　　处：《四川农业大学学报》2010年第1期28-34,共7页Journal of Sichuan Agricultural University

基　　金：国家自然科学基金(30671219);973项目"主要粮食作物高产栽培与资源高效利用的基础研究"(2009CB118600);公益性行业科研专项"最佳养分管理技术研究与应用"(200803030)

摘　　要：以超级杂交稻,普通杂交稻、高产常规稻3种不同类型中稻品种为研究材料,采用齐穗后遮光(70%)和不遮光两种处理方式,研究了光强变化对超级杂交稻干物质生产和氮素营养吸收与分配的影响,以揭示超级杂交稻产量稳定性较差的原因。结果表明,遮光处理后:①超级杂交稻干物质生产累积量大幅度减少,干物质分配到穗中的比率仅为32.1%,低于其他类型品种;②超级杂交稻谷粒氮总积累量降幅达33.9%,氮收获指数下降12.3%,而普通杂交稻和常规稻分别只降低19.8%和26.9%;③超级杂交稻产量下降幅度为53.1%,显著低于常规稻和普通杂交稻品种。To elucidate the cause of instability of grain yield of super-hybrid, 2 super-hybrid combinations, 2 conventional hybrid combinations and 2 inbred cuhivars were used in this study. The dynamics of dry matter accumulation and nitrogen nutrition uptake and distribution after full heading stage were investigated under different light intensity with two treatments： natural light and 70% shading. The results indicated that, under shading： （1） The amount of dry matter accumulation was lower than that of other cultivars （combinations） with a significant decrease and the rate of dry matter amount of super hybrid distributed to panicles was only 32. 1%; （2） The total nitrogen contents in grain of super-hybrid was decreased by 33.9%, which is higher than that of conventional hybrid （19.8%） and inbred cultivars （26.9%）, and the nitrogen harvest index of super hybrid was decreased by 12.3%; （3） The grain yield was decreased by 53. 1%, which is significantly lower than that of other cuhivars.

关 键 词：遮光 超级杂交稻 干物质 氮素 产量 

分 类 号：S511[农业科学—作物学]