Abstract: In order to provide the theoretical support for the cultivation and variety breeding of high-yield wheat in Henan Province, a field experiment with 6 wheat varieties was carried out to analyze the grain filling characteristics and yield of wheat. The cubic polynomial equation was used to fit the grain filling process, the correlation analysis was used to explore the relationship between grain weight and grain filling characteristics, and the difference of yield components among these varieties was discussed. The results showed that the 1000-grain weigh of Zhengmai 0943 and Xuke 316 was the highest(50.64 g) and lowest(45.02 g), respectively, among the 6 varieties. The grain filling rates were different among the varieties. The simulated curve of grain filling process presented a "S" shape, whereas the model parameters were different among these varieties. The 1000-grain weight had significant positive correlations with maximum grain filling rate(Vmax) and theoretical maximum grain weight(W), and also had higher positive correlations with the mean grain filling rate(V), effective grain filling period(Se), and mean grain filling rate during the effective grain filling period(Vs). It suggested that the grain weight could be greatly improved by optimizing the grain-filling characteristic parameters, including Vmax, W, V, Se and Vs. The grain yield of Yumai 49-198 was significantly higher than those of other five varieties, indicating that the improvement of grain yield should be in coordination with rational spike number and grain number per spike, in addition to raising the grain weight.

Key words: Wheat varieties, Grain filling characteristics, Grain weight, Yield

CLC Number: 

• S512.1