Abstract:

In order to discuss the breeding strategies and direction on wheat yield in region of middle and lower reaches of the Yangtze River, genetic and path analysis of yield traits were studied on wheat varieties which large plant in this region. The results showed that 1000-grain weight had main effects to yield construction from middle to high yield level. Spikes per unit area were second, but it was interrelated mostly with environment. Meanwhile, grains per spike had little role on yield construction. 1000-grain weight and spike number had primary action on yield. The effect of grains per spike on yield was broken down by spike number and 1000-grain weight. The three factors of yield construction showed different results under low to high yield level. The number of spikes and 1000-grain weight increased more from low to middle yield, however, in high yield level the number of spikes change little, grains per spike and 1000-grain weight increase mostly. Thus, the breeding strategy in this region should keep the spikes number as present and increase the grains per spike and improved kernel weight in future high yield breeding.