Evaluation Of Agronomic And Quality Character Of Sichuan Wheat Landraces And Molecular Cloning Its Gliadin Genes

Crop landraces are derived from natural and artificial selections, and are the stable complex population. They have distinct natural geography and local characters. In 1936, Sichuan wheat landraces collected, and some landraces with good quality were identified. A few genetic resources had been utilized in wheat improvement. However, the yield of wheat landraces are low, and they are susceptible to disease. Thus, wheat landraces were restricted to be used in breeding program and were gradually replaced by modern cultivars in 1980s, resulting in the narrow genetic diversity of wheat occurred. The objectives of the study are to evaluate 67 Sichuan wheat landraces, and to isolate the gliadin genes. The main results are as following:1. The agronomic characters of the 67 wheat landraces were investigated. The results showed that the plant height of most landraces was too high to be used for breeding program, and the spike number per plant of most landraces was less than ten. Some landraces had higher grain number per spike, whereas the 1000-grain weights of these landraces were lower. Correlation analysis of agronomic characters indicated the grain weight per plant would increased obviously with the increase of spike number per plant, spikelet number, grain number per spike and 1000-grain weight. However, 1000-grain weight and grain weight per plant would decrease with the increase of plant height and grain number per spike. The stepwise regression and path analysis of agronomic characters...