小麦芽期和苗期耐盐性综合评价

Evaluation of Salinity Tolerance in Wheat(Triticum aestium)Genotypes at Germination and Seedling Stages

土壤盐渍化严重影响小麦生产,提高小麦耐盐性是应对土壤盐渍化的主要途径之一,耐盐种质资源是耐盐性遗传改良的材料基础。本研究以小麦为材料,筛选芽期和苗期耐盐性鉴定评价的适宜Na Cl浓度,明确了小麦芽期耐盐性鉴定的最适Na Cl溶液浓度为1.2%,苗期耐盐性鉴定的最适土壤Na Cl浓度为0.8%。用该盐浓度胁迫处理321份小麦材料,获得芽期高耐盐材料21份,占供试材料的6.5%;苗期高耐盐材料18份,占供试材料的5.6%;芽期和苗期均为高耐盐的材料2份,分别是中作60115和冀麦一号。

Soil salinization seriously impacts wheat（ Triticum aestivum L.） production. Improving salinity tolerance is one of the main approaches responding to the problem. Salinity-tolerant germplasm resources provide a plant material basis for the improvement of salinity tolerance in crops. The present research firstly selected the appropriate salinity stress conditions for evaluating salinity tolerance at germination and seedling stages by screening a series of NaCl concentrations. The results showed that 1. 2% NaCl solution and 0. 8% NaCl in soil were the optimal concentrations for germination and seedling stages separately. Under the selected NaCl stress conditions,some morphological and physiological traits of 321 wheat genotypes were tested at the two stages. The salinity tolerance of the genotypes were evaluated and classified by principal component analysis and cluster analysis. Total of 21 and 18 genotypes with high salinity tolerance at germination and seedling stages were identified,which accounted for 6. 5% and 5. 6% of the tested genotypes,respectively. Two genotypes,Zhongzuo 60115 and Jimaiyihao,were determined as the high salinity tolerance at both germination and seedling stages.