耐低钾冬小麦基因型筛选方法的研究

通过液培实验及低钾土壤上的田间实验，比较，讨论了耐低钾冬小麦基因型的筛选指标，时期及钾浓度，结果表明：液培筛选的评价指标，吸钾量优于钾利用指数，筛选的适宜时期为拔节期，钾浓度以１．０ｍｍｏｌ／ＬＫ＾＋为宜，低钾土壤７种基因型的经济产量与植株地上部吸钾量间存在极显著正相关（ｒ＝０．９４５，ｎ＝２１）。冬小麦吸收的钾主要来自于１ｍｏｌ／Ｌ热ＮＨＯ３不能提取的非交换性钾，吸钾量亦可作主田间筛选的评价指标

STUDY ON METHOD FOR SCREENING WINTER WHEAT GENOTYPES TOLERANT TO LOW POTASSIUM LEVEL

Methods for screening winter wheat genotypes tolerant to low potassium level were studied by water culture and field experiments on a soil of low potassium fertility. It was observed that the amount of K absorbed was better than potassium utilization index when used as the screening index. The 1.0 mmol/L K concentration of the medium was found to be the suitable index at jointing stage of the plant. There was a significantly positive correlation between grain yield and the K content of shoot for 7 genotypes of winter wheat on the low-potassium soil (r=0.945^**,n=21). The amount of K absorbed by winter wheat was most from the non-exchangeable K of the soil that can not be extracted with lmol/L hot HNO₃ was the largest. The amount of K absorbed by winter wheat could also be used as a field screening index.