为了研究NaCl胁迫对小麦发芽率的影响，探明小麦芽期的耐盐能力。以宁夏已审定的78个小麦品种和新品系为供试材料，以纯净水处理为对照，设置1、2、3、4、5、6、7 g/kg的NaCl溶液处理，测定其发芽率。结果表明，小麦种子发芽率随着盐浓度的增加而降低。当NaCl浓度≤2 g/kg时，发芽率均保持在80%以上；NaCl浓度为3 g/kg时，发芽率在70%左右；NaCl浓度为4 g/kg时，发芽率降至40%左右；NaCl浓度为5 g/kg时，发芽率降至20%以下；NaCl浓度为7 g/kg时，发芽率接近于零。说明NaCl浓度3 g/kg是小麦芽期耐盐临界值。结合聚类分析，初步筛选出芽期耐中度盐分的小麦品种6份，分别为春小麦品种HJ437、宁春8号、宁春48号、宁春49号，灌区冬小麦品种冬宁春4号、冬育10号。

To study the effect of NaCl stress on wheat germination rate and to explore salt tolerance of wheat during germination stage. Seeds from 78 Wheat varieties and new lines in Ningxia were used and treated with NaCl solution with concentration gradients of CK(purified water), 1 g/kg, 2 g/kg, 3 g/kg, 4 g/kg, 5 g/kg, 6 g/kg and 7 g/kg, respectively, and the germination rates were determined. Results showed that germination rates of wheat seeds decreased with the increase of salt concentration. Germination rates were above 80% when the salt concentration was ≤2 g/kg, germination rates were around 70% when the salt concentration was 3 g/kg, germination rates were around 40% when the salt concentration was 4 g/kg, germination rates were below 20% when the salt concentration was 5 g/kg, and germination rates were nearly 0 when the salt concentration was 7 g/kg, which indicated that the salt concentration of 3 g/kg was the critical threshold for salt tolerance during wheat germination. Combined with cluster analysis, 6 wheat varieties with moderate salt tolerance were screened, namely spring wheat varieties HJ437, Ningchun 8, Ningchun 48 and Ningchun 49, and irrigated winter wheat varieties Dongningchun 4 and Dongyu 10.

S512.1

国家重点研发计划(2021YFD1900603)。