Abstract: Grain development on wheat spike is asynchronous. Effect of spikelet and grain position on fertile spikelet number, 1000-kernel weight and quality of three high quality wheat cultivars, Linyou 2018, Linyou 145 and Linyou 2069, were studied, using field experiment. Results showed that, firtile spikelet number, spikelet weight, 1000-kernel weight, protein content, dry gluten, sedimentation value, dough rheology characteristic in different spikelet positions showed parabolic changes. And this is accord with medial dominant in grain development. 1000-kernel weight of different grain position varied with the grain number of spikelets. 1000-kernel weight of the first grain position is close to that of the second grain position, and both higher than that of the third grain position. Coefficient of variation of protein content, dry gluten and sedimentation value of the second grain position in Linyou 2018 and Linyou 2069 was higher than other grain positions, and that of the first grain position in Linyou 145 was higher. In conclusion, the second grain position of Linyou 2018 and Linyou 2069 and the first grain position of Linyou 145 were major factors for variation of quality of high quality wheat, so they had bigger potential in improving quality. Therefore, in wheat breeding, through selecting cultivars with multi-spike, little florets, high quality wheat can reach high yield and well quality simultaneously.

Key words: High quality wheat, Spikelet position, Grain position, firtile spikelet number, Grain weight, Quality, Spatial distribution