盐胁迫对海岛棉种子活力的影响

【目的】 研究不同基因型海岛棉萌发期的耐盐特性,分析盐胁迫下海岛棉种子活力指标的变化规律,为培育耐盐海岛棉品种提供支持。【方法】 以35份海岛棉种子作为材料,以NaCl溶液(150 mmol/L)模拟盐胁迫条件,统计分析发芽势、发芽率、根长、下胚轴长、苗鲜重、苗干重6项指标。【结果】 (1)盐胁迫条件下,海岛棉种子各指标受影响程度不同,其中下胚轴受影响程度最大,苗干重受影响最小;(2)与对照样本比较,其中发芽势、发芽率、根长、下胚轴长、苗鲜重5项指标最大值、最小值、平均数均低于对照,苗干重的最大值、最小值、平均值则高于对照。【结论】 35份海岛棉种子分为3类:第Ⅰ类属于高耐盐品种,第Ⅱ类属于中等耐盐品种,第Ⅲ类属于低耐盐品种。

Effects of Salt Stress on Seed Vigor of Gossypium barbadense L.

【Objective】 The aim of this study is to reveal the salt tolerance characteristics of different genotypes of Gossypium barbadense L. during germination, and explore the variation rule of its seed vitality index under salt stress in the hope of providing support for the cultivation of salt-tolerant varieties.【Method】 35 sea-island seeds were used as test materials, and salt stress conditions were simulated by NaCl solution (150 mmol/L) in this experiment. Six indicators of germination potential, germination rate, root length, hypocotyl length, fresh weight and dry weight were statistically analyzed.【Result】 The results showed that: (1) Under salt stress, the indexes of Gossypium barbadense L. seed were affected differently, among which hypocotyls were most affected and dry weight was the least affected; (2) Compared with the control samples, the maximum, minimum and average of the five indexes of germination potential, germination rate, root length, hypocotyl length and seedling fresh weight were lower than those of the control, while the maximum, minimum and average values of seedling dry weight were higher than those of the control. 【Conclusion】 Cluster analysis results showed that 35 Gossypium barbadense L.seeds were divided into three categories: the first category belonged to high salt tolerance varieties, the second category belonged to medium salt tolerance varieties, and the third category belonged to low salt tolerance varieties.