Abstract: "This article researched the light radiation character on the different type high-yield variety wheat in grain filling time,and analysised the correlation on various factors of output and the canopy structure in grain-filling stage.The result indicated:The leaf area index(LAI) of various high-yield variety was highest at anthesis,afterward drops gradually;the general trend of the mean foliage inclination angle(MFIA) increased first,then reduced;The leaf blade distribution(LD) was the most in the preliminary unit of grain-filling;The transmission coefficient for radiation penetration(TR) increased gradually along with the grouting birth advancement;The extinction coefficient(K))enlarged in the grouting time along with the angle increasing;The leaf area index(LAI) of the middle and the last-filling stage were remarkable positive correlation with the output and the seeds per-spike,the mean foliage inclination angle(MFIA) in earlier period of grain-filling and 1 000-grain weight were remarkable negative correlation.Therefore,in high-yield wheat breeding,it was important to improve the leaf area index(LAI) in middle and last period of grain-filling and appropriatly reduce the mean foliage inclination angle(MFIA) in former stage of grain-filling."

Key words: Highyield, Grain-filling stage, Light radiation, Output

CLC Number: 

• S512.1