The new variety breeding of tetraploid hybrid wheatgrassMengza No.1

The superior tetraploid hybrid wheatgrass variety SZB02 was selected from colchicine induced chromosome doubling F1 hybrids after widely crossing of Agropyron cristatum cv. Fairway and Agropyron mongolicum. And then, the new variety of tetraploid hybrid wheatgrassMengza No.1 was obtained after a series of tests including varieties comparison, regional and production which lasted 13 years. Mengza No.1 is a perennial gramineous herb with fibrous root system, regular plant growth, lanceolate leaf length, and wide panicle type. The fresh grass yield, dry grass yield and seed yield of Mengza No.1 with twice mowing per year was 25 938.35 kghm-2, 9 552.33 kghm-2 and 802.37 kghm-2, respectively, which suggest that this variety has relatively high grass yield. Mengza No.1 has crude protein content of 16.13 % in anthesis, and is rich in nutritional composition such as crude fat, nitrogen free extract, calcium and phosphorus. It also has characteristics of soft texture, high leaf yield and good palatability which can be used for green fodder, graze and hay. It has strong resistance to low temperature in earlier development stage and wide ecological adaptability, which is suitable to be applied in the areas with the effective accumulated temperature more than 2 200 ℃d (10 ℃).