【摘要】 为揭示干旱胁迫下不同棉花品种对CaCl₂响应的生理机制,以3个抗旱性不同的棉花品种豫棉19、GK20、鲁研棉28的幼苗为试验材料,采用PEG处理模拟干旱胁迫,研究CaCl₂对干旱胁迫下幼苗生长和生理特性的影响。结果表明,干旱胁迫下,各棉花品种不同浓度CaCl₂处理间株高差异不显著;抗旱性品种豫棉19和生产对照品种鲁研棉28在40 mmol/L CaCl₂处理后鲜质量、干质量、SPAD值、SOD和POD活性、脯氨酸含量均显著高于其他处理,MDA含量低于其他处理;水分敏感品种GK20在20 mmol/L CaCl₂处理后鲜质量、干质量、SPAD值、SOD和POD活性、脯氨酸含量显著高于其他处理,MDA含量显著低于其他处理。可见,一定浓度的CaCl₂能提高棉花幼苗的抗旱性,但不同棉花品种的最适CaCl₂浓度不同。更多还原

【Abstract】 To reveal the physiological mechanism of different cotton varieties response to CaCl₂ under drought stress,three cotton cultivars（ Yumian 19,GK20 and Luyanmian 28） with different drought resistance levels were selected as materials,the effects of CaCl₂ on growth and physiological characteristics of cotton seedlings were studied under drought stress with PEG. The results showed that under drought stress,except plant height without significant difference among different CaCl₂ treatments,the fresh weight,dry weight,SPAD value,proline content,SOD and POD activities of Yumian 19 and Luyanmian 28 of 40 mmol/L CaCl₂ treatment were generally higher than the other CaCl₂ treatments,while MDA content was generally lower; fresh weight,dry weight,SPAD value,proline content,SOD and POD activities of GK20 of 20 mmol/L CaCl₂ treatment were generally higher than the other CaCl₂ treatments,while MDA content was lower. This experiment indicated that CaCl₂ could improve the resistance to drought stress of cotton seedlings,but the optimal concentrations varied from cultivar to cultivar.更多还原