食用型向日葵不同性状对产量的贡献率

The contribution of different traits of edible sunflower on yield

试验以7个自选食用型向日葵杂交组合,通过随机排列组合对7个品种进行农艺性状、经济性状和光合性状研究。研究结果显示,所测17个性状中单盘粒数、单盘粒重、光合速率、胞间CO2浓度、生育期以及茎粗与结果均呈显著或者极显著相关关系;进一步对6个性状与产量之间的通径分析表明,单盘粒数、单盘粒重、光合速率(Pn)、胞间CO2浓度(CO2)、生育期以及茎粗6个参数决定了产量变异的98.65%,其中以单盘粒重对产量的直接贡献最大,其次为生育期,再次为光合速率,胞间CO2浓度对产量的贡献率达到0.389 5;而单盘粒数和茎粗对产量的直接贡献则很小,其对产量的贡献主要通过单盘粒重和生育期来实现。

This experiment takes 7 optional edible sunflower crosses, and studies the agronomic characters, economic characters and Photosynthetic Characters of the 7 varieties by random permutation and combination.. The results show that the 17 characters in the single disc grain number, grain weight per plant, photosynthetic rate, intercellular CO2 concentration, growth period and stem diameter and the results were significant or very significant correlation between the 6 further; the characters and yield of path analysis showed that grain number, single disc grain weight per plant, photosynthetic rate （Pn）, intercellular COz concentration （CO2）, growth period and stem diameter of 6 parameters determine the variation of seed yield in 98.65%, the single disc grain weight on yield directly the largest contribution, followed by photosynthetic rate, again for the intercellular CO2 concentration, growth period of the yield contribution rate reached 0.389 5 while the single disc grain number and stem diameter direct contribution to yield is very small, its contribution to yield mainly through the grain weight per plant and growth period to achieve.