超级杂交稻扬两优6号不同栽插密度下的群体生长特性  

Population Growth Characteristics of Super Hybrid Rice Yangliangyou 6 with Different Transplanting Densities

作　　者：戴正元[1] 李爱宏[1] 肖宁[1] 潘存红[1] 李育红[1] 张小祥[1] 夏广红[1] 张洪熙[1] 

机构地区：[1]江苏里下河地区农业科学研究所国家水稻改良中心南京分中心,江苏扬州225007

出　　处：《江苏农业学报》2010年第1期22-27,共6页Jiangsu Journal of Agricultural Sciences

基　　金：国家"863"计划项目(2002AA207002);江苏省科技支撑计划项目(BE2008352)

摘　　要：以汕优63为对照,研究不同栽插密度(1 hm21.50×105穴、2.25×105穴、3.00×105穴、3.75×105穴)条件下超级杂交稻扬两优6号的群体生长特性,结果表明:扬两优6号分蘖性中等偏弱,孕穗期前叶面积指数随栽插密度的增加而增加,当1 hm23.00×105穴时,其不同生育阶段叶面积指数达到饱和值;齐穗后,扬两优6号的光合速率、蒸腾速率和气孔导度均下降,光合产物对籽粒的输入量增加,但在1 hm23.00×105穴时,其光合速率、蒸腾速率和气孔导度下降速度最慢,光合产物对籽粒的输入量最多;在不同密度试验条件下,以1 hm23.0×105穴的总颖花量最大、结实率最高,千粒重较稳定,产量也最高。说明,适度密植是发挥扬两优6号超高产潜力的有效措施。The group growth and development characteristics of super rice, Yangliangyou 6, was studied under different planting densities with Shanyou 63 as a control. Chlorophyll content was evaluated with SPAD determinator, photosynthetic rate, transpiration rate and stomatal conductance were surveyed with CID porosity apparatus, and yield traits, dry matter, and basic agronomic traits were measured by conventional methods. The tillering capability of Yangliangyou 6 was medium to low. Before booting, Yangliangyou 6 showed rising in leaf area index as the transplanting density was increased. However, leaf area index stayed stable when the transplanting density reached 3. 00 × 10^5 holes in 1 hm^2. After heading, the photosynthetic rate, transpiration rate and stomatal conductance of Yangliangyou 6 declined, the slowest declining speeds at the transplanting density of 3.00 ×1065 holes in 1 hm62. The transportation of photosythetic product to the seed enhanced, with the highest transportation at the transplanting density of 3.00 ×10^5 holes in 1 hm^2 In different planting density trials, Yangliangyou 6 presented the largest number of total spikelets, the highest seed setting rate, stable 1 000-grain weight and highest yield level under 3.00 ×10^5 holes in 1 hm^2 condition. The results indicates that an appropriate transplanting density is effective to improve yield potential for Yangliangyou 6.

关 键 词：超级杂交稻 扬两优6号 栽插密度 群体生长特性 

分 类 号：S511.01[农业科学—作物学]