关键词: 甜菜, 甜菜, 遗传多样性, 表型, SSR分子标记

Abstract: Salt stress, as one of the major abiotic stresses, severely limits crop productivity. Study on salinity effects on maize seedling growth and yield components would improve management practices in fields and increase the understanding of salt tolerance mechanism of maize.‘Suyu 10’and‘Suyu 30’with salt tolerance were selected to evaluate the effects of different salinities on maize grain yield and traits related to yield. The results indicated that the grain yield decreased linearly with salinity increase, under the salinity of 1.5 g/kg soil, the grain yield of‘Suyu 10’and‘Suyu 30’accounted for 54.2% and 64.3% of that without salt stress. Among yield components, kernel number per ear was more sensitive to salinity than 100- kernel weight. Biomass (fresh and dry weight) at jointing stage correlated positively with grain yield. Among salt tolerance indexes including relative fresh weight, relative dry weight, relative water content and relative grain yield, relative grain yield was better for characterizing salt resistance, differences among various salinity gradients reached a significant level. It was concluded that under the salt stress of 1.5g/kg soil, the yield of maize was only about 60% of that without salt stress, and the breeding of salt tolerant maize, especially the salt tolerance at seedling stage, should be strengthened.