摘要
为探究棉粕对盐碱胁迫下棉花(Gossypiumhirsutum)的抗盐碱机理,通过田间试验,研究添加不同棉粕用量对8g·kg~(–1)盐碱胁迫下棉花生理及生长的补偿效应。结果表明,添加棉粕能够增加盐碱胁迫下棉花不同器官对K~+的吸收,降低对Na~+的吸收,维持盐碱胁迫下细胞内K~+和Na~+的平衡,显著促进棉花生长,提高叶片叶绿素含量和光合作用效率,有效缓解盐碱胁迫对棉花的伤害。其中,以添加6 000 kg·hm~(–2)棉粕处理的效果最显著,且盐胁迫下棉粕的改良效果较好。主成分分析结果表明,盐碱胁迫下棉花生长生理的主要影响因子为叶片K~+/Na~+比值、根长、鲜重、干重和胞间CO_2浓度(C_i)。
We investigated the salt-tolerant mechanism of cottonseed meal in cotton(Gossypium hirsutum) under salinity-alkalinity stress. Salinity-alkalinity stress of 8 g·kg~(–1) was tested in the field to explore the effect of cottonseed meal dose on the physiology and growth of cotton. Cottonseed meal could increase the absorption of K+ and decrease that of Na~+. K~+ and Na~+ were kept in ion balance in cells under salinity-alkalinity stress. Cottonseed meal could effectively alleviate damage to cotton, significantly promote growth of cotton, and improve chlorophyll content and photosynthesis of leaves. An amount of 6 000 kg·hm~(–2) cottonseed meal was the most significant treatment, and the improvement effect of cottonseed meal under salt stress was better. According to principal component analysis, the K~+/Na~+ ratio in leaves, root length, fresh weight, dry weight and intercellular CO_2 concentration were the main factors involved in salinity-alkalinity stress.
引文
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