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The middle and lower reaches of Yangtze River is the largest production belt of weak-gluten wheat in China. Due to the humid and rainy weather in the middle and late period of wheat growth, Fusarium head blight (FHB) and powdery mildew (PM) occurre frequently and seriously, and FHB led to the accumulation of DON toxin in pathogen-infected grains. Wheat yellow mosaic virus (WYMV) often happens after a cold winter. These disasters threaten grain yield and food security. Yangmai 15 is an elite weak-gluten and high-yield cultivar bred at the beginning of 21 century, but its comprehensive resistance is weak. To keep the advantages of Yangmai 15 and improve disease resistance, a backcross population was constructed with Yangmai 15 as the recurrent parent, and 92R137(a soft-grain cultivar with high resistances to PM and WYMV) and Ningmai 9(a soft-grain wheat cultivar conferring moderate resistance to FHB) as the donor parents. In lower generations, molecular markers were used to select plants pyramiding PM resistance gene Pm21 and WYMV resistance QTL QYm.nau-2D. In high generations, FHB resistance was evaluated and the key quality indices were tested together with grain yield. Finally, a new weak-gluten and high-yield wheat line Yang 18465 conferring resistance to FHB, PM and WYMV, was bred and introduced to the national wheat regional test in the middle and lower reaches of Yangtze River. The breeding procedures of Yang 18465 will provide a useful reference for the breeding of similar varieties.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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