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耐低钾冬小麦基因型筛选方法的研究
STUDY ON METHOD FOR SCREENING WINTER WHEAT GENOTYPES TOLERANT TO LOW POTASSIUM LEVEL
【摘要】 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10mmol/LK+为宜。低钾土壤上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HNO3不能提取的非交换性钾。吸钾量亦可作为田间筛选的评价指标。
【Abstract】 Methods for screening winter wheat genotypes tolerant to low potassium level were studied by water cultllre 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 1.0mmol/L K concentration of the medium was found to be the suitable index at jointing stage of the plant. There was a sigificantly 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 ot K absorbed by winter wheat was most from the non-exchangeable K of the soil that can not be extracted with 1mol/L hot HNO3 was the largest. The amount of K absorbed by winter wheat could also be used as a field screening index.
【Key words】 Winter wheat; Genotypes tolerant to low potassium; Amount of potassium absorbed; Potassium utilization index;
- 【文献出处】 土壤学报 ,ACTA PEDOLOGICA SINICA , 编辑部邮箱 ,1998年03期
- 【分类号】S147.2
- 【被引频次】74
- 【下载频次】150