有效利用土壤磷的小麦种质筛选方法研究

利用由不同地点采集的土壤样品布置了9次土培试验， 对437份不同小麦品种 在不同有效磷含量土壤中的磷营养特性表现进行了较全面的鉴定。 发现， 施磷处理和减 磷处理土壤有效磷含量的差距即选择压力是土培试验鉴定成败的关键因素。 施磷处理的土 壤有效磷含量为24 mg/kg左右， 减磷处理的土壤有效磷含量为8 mg/kg左右是利用

Studies on Wheat Germplasm Screening Method for Efficient Utilization of Soil Phosphorus

To screen the wheat germplasm with high P utilization efficiency from 437 diffe rent cultivars, 9 experiments of soil pot culture were carried out. The soil sam ples had various available P contents, and collected from different farmland, s uburbs of Beijing. It was found that the screening pressure, i.e., the differenc e of available P content between P and -P treatment, is the key factor in soil pot cultures. The critical contents of available P for the screening were 24 mg /kg and 8 mg/kg for P and -P treatments respectively. Both too low or high scre ening pressure would lead to the unfull expression of wheat tolerance to low P a nd the little difference between cultivars with hig h or low P utilizing efficiency, which made screening difficult. The results al s o showed that biomass of wheat seedling in soil pot cultures can serve as an the earlier selection criterion for tolerance to low soil phosphorus content, by wh ich large scale screening of wheat germplasm can be carried out rapidly and eff iciently.