【摘要】 以鲁棉 1 4为试验材料 ,利用盆栽和田间试验分别研究了棉苗生长对 Na Cl胁迫的反应及微量元素、激素浸种处理的效应。结果表明 ,Na Cl胁迫下“土壤 -棉花”系统 Na+、K+消长规律分别符合 y1=0 .1 70 38+ 6.70 32 3x( r=0 .941 6**)、y2 =1 . 0 1 0 72 - 0 . 92 4 0 7x ( r=- 0 . 8685 *)和 y=1 .0 5 0 98- 0 . 1 460 5 xi( r=- 0 . 9771 **) ,棉株体内Na+、K+含量与土壤盐分 ( Na Cl)含量具有显著或极显著的相关性。土壤盐分胁迫抑制棉花生长 ,但棉花可通过提高保护酶 ( SOD、POD、CAT)活性而表现出一定的耐盐伤害能力 ,土壤中 Na Cl含量 0 .3%～ 0 .4%是棉花保护酶活性的变化转折点。适宜的微量元素和激素浸种处理 ,具有增强棉花耐盐性的作用 ,浸种效应以 Mo1 0 0 0 mg· L- 1、Mn1 0 0 0 mg·L- 1、GA5 0 mg· L- 1浸种 2 4 h处理较好 ,效果显著更多还原

【Abstract】 The responses of seedling growth of cotton to NaCl stress and effects of seed soaked with microelement and hormone under salt stress throuth pot and field experiments were studied respectively with the variety Lumian 14.The results showed that the law of growth and decline between Na + and K + in "soil cotton" system under NaCl stress was described by these eqations:y 1=0.17038+6.70323x (r= 0.9416 ** ), y 2=1.01072 0.92407x (r= 0.8685 *) and y=1.05098 0.14605xi (r= 0.9771 ** ). The correlation between the content of Na + and K + in cotton and NaCl content in soil was significant.The growth of cotton was deterred by salt stress in soil,but the salt tolerance of cotton was promoted to certain extent by raising the activity of protective enzymes (SOD,POD,CAT).A turn point of activity of protective enzymes in cotton was at the 0.3%~0.4% NaCl content in soil.The salt tolerance of cotton was promoted by seed soaked with proper microelement and hormone. Among the treatments, the effects of Mo1000mg·L 1 , Mn1000mg·L 1 , GA50 mg·L 1 soaking for 24 hours were significant respectively.更多还原