摘要： 为了探讨种子超重力处理与黄瓜耐盐性的关系,研究种子经超重力处理后对NaCl胁迫下黄瓜种子萌发、幼苗生长及相关生理指标的影响。结果表明,NaCl胁迫下,黄瓜种子萌发、幼苗生长和生理指标受到显著抑制。种子在1 000,2 000,3 000×g超重力水平下分别处理1 h和2 h,各发芽指标包括发芽率、发芽指数和活力指数均显著提高,以2 000×g,2 h处理最佳;超重力水平进一步增加到4 000×g,处理1 h发芽率变化不显著,其余处理各指标均显著降低。幼苗期进行NaCl胁迫,与一定浓度单独盐胁迫相比,种子提前进行2 000×g,2 h超重力处理,生物量显著增加,根系活力、叶绿素含量和SOD活性显著提高,MDA含量显著降低。种子经一定条件超重力处理后,可提高盐胁迫下黄瓜种子的萌发和幼苗生物量,对生理指标也起到积极作用,有效缓解盐害,增强了植株耐盐性。

关键词: 超重力处理, NaCl胁迫, 黄瓜

Abstract: The objective of this study was to investigate the relationship of seed hypergravity treatment and cucumber salt tolerance.Effect of seed hypergravity treatment on cucumber germination,seedling growth and relative physiological indexes under NaCl stress was studied.The result showed that cucumber germination,seedling growth and physiological indexes were significantly inhibited under NaCl stress.After seeds were treated with the hypergravity of 1 000,2 000,3 000×g for 1,2 hours respectively,every index including germination rate,germination index and vigor index significantly improved than the values in NaCl stress,in which effect of 2 000×g,2 h seed hypergravity treatment was the best.Added the strength of hypergravity to 4 000×g,germination rate had not obvious change for 1 hours treatment,every index significantly decreased in other treatments.In seedling period,there was different effect between 2 000×g,2 h seed hypergravity and NaCl combined treatment and sole NaCl treatment.Seedling biomass significantly increased,root activity,chlorophyll content and SOD activity significantly improved,MDA content significantly decreased in combined treatment than in sole NaCl treatment with certain concertration.Seed hypergravity treatment could improved cucumber seed germination and seedling biomass,actively regulated physiological indexes in seedling period under NaCl stress,which alleviated stress injury and strengthened plant salt tolerance.

Key words: Hypergravity treatment, NaCl stress, Cucumber

中图分类号: 

• S642.2