外源钙对盐胁迫下燕麦幼苗生长和生理特性的影响
文献类型: 中文期刊
作者: 张佳琪 ;;赵欣宇 ;;秦子涵 ;;刘思齐 ;;殷国梅 ;;孙娟娟 ;;杨玉光 ;; 梁 燕 ;;潘尚军 ;;赵金梅
作者机构:
关键词: 燕麦;;钙;;盐胁迫;;生长;;生理特性
期刊名称:中国草地学报
ISSN: 1673-5021
年卷期: 2025 年
页码:
收录情况: 北大核心(2023版) ; ; CSCD(2025-2026年度) ; ; 科技核心(2024版) ; ; 农林核心(2024版)
摘要: 本研究以白燕 7 号燕麦为材料,采用水培法研究喷施外源钙对盐胁迫下燕麦幼苗生长的影响。在复合盐 胁迫(NaCl∶Na2SO4=1∶1)浓度为 200 mmol/L 条件下,于燕麦幼苗(三叶一心)期叶面喷施浓度 10、20、30、40 mmol/L CaCl2,分析不同浓度 CaCl2对燕麦幼苗形态指标和生理特性的影响,以筛选适合缓解盐胁迫损伤的 Ca2+浓度。结果 表明,200 mmol/L 盐胁迫显著抑制燕麦幼苗的正常生长。与不施钙处理相比,外源喷施 10 mmol/L 的 CaCl2处理燕 麦幼苗的株高和叶片中超氧化物歧化酶(SOD)活性分别提高了 9. 31% 和 46. 99%(P<0. 05),脯氨酸和丙二醛含量 分别降低了 55. 32% 和 18. 84%(P<0. 05);相对电导率和可溶性糖含量在 CaCl2处理浓度为 10、20 mmol/L 时显著 下降(P<0. 05),且在 10 mmol/L 时最低,分别降低了 48. 59% 和 33. 74%;燕麦根系中的 K+ 含量在 CaCl2处理浓度 为 10、20 mmol/L 时高于不施钙处理,20 mmol/L 时差异显著(P<0. 05),达 30. 62%,Na+/K+也在 CaCl2处理浓度为 20 mmol/L 时显著降低 29. 35%(P<0. 05);燕麦叶片中的 K+含量在 CaCl2处理浓度为 10、20、30 mmol/L 时高于不 施钙处理,30 mmol/L时达到显著差异(P<0. 05),增加了 26. 22%,Na+/K+在 CaCl2处理浓度为 30 mmol/L时最低。综 上,添加外源Ca2+最佳浓度为10 mmol/L,可以提高抗氧化酶活性,降低膜损伤,缓解盐胁迫的危害。
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