盐碱胁迫对不同棉花品种生长及离子组含量分布的影响

【目的】 分析盐碱胁迫对棉花生长、生理及离子平衡的影响,从离子平衡角度研究棉花抗盐性的内在机制。【方法】 以鲁棉研24号与新陆早45号棉花为材料,设置无盐(CK)、混盐(SA)2个盐度。【结果】 盐碱胁迫下,鲁棉研24号与新陆早45号的生长及光合作用受明显抑制,相对电导率、丙二醛和脯氨酸含量显著增加。鲁棉研24号叶中P含量显著增加了55.80%,新陆早45号无显著变化。 鲁棉研24号与新陆早45号各器官中的Na含量均显著增加,鲁棉研24号茎、根中K含量分别显著增加了25.20%、26.04%,叶中K及植株总体Ca、Mg含量有所下降。鲁棉研24号与新陆早45号地上部分Zn、Al、Mn、Mo含量显著增加,地下部分显著降低。【结论】 盐碱胁迫下新陆早45号较鲁棉研24号吸收了更多的Na,导致植物对N、P、K、Ca、Mg等离子的选择性吸收能力降低,且鲁棉研24号较新陆早45号具有更强的将各离子向地上部分运输的能力,提高自身在盐碱胁迫下的耐盐性。

Effects of Saline-alkali Stress on Growth and Ion Group Content Distribution of Different Cotton Varieties

【Objective】 To study the effects of saline-alkali stress on cotton growth, physiology and ion balance and explore the intrinsic mechanism of salt tolerance of cotton from the perspective of ion balance. 【Method】 In this experiment, cotton of Lumianyan 24 and Xinluzao 45 were used as materials, and two salinities of no salt (CK) and mixed salt (SA) were set. 【Result】 (1) Under saline-alkali stress, the growth and photosynthesis of Lumianyan 24and Xinluzao 45 were significantly inhibited, and the relative conductivity, malondialdehyde and proline contents were significantly increased. (2) The content of P in Lumianyan 24 leaves increased significantly by 55.80%, while Xinluzao 45 did not change significantly. Na content in organs of Lumianyan 24 and Xinluzao 45 increased significantly, K content in stems and roots of Lumianyan 24 increased by 25.20% and 26.04%, respectively. K content in leaves and Ca and Mg content in plants decreased.(3) The contents of Zn, Al, Mn and Mo in the overground part of Lumianyan 24 and Xinluzao 45 increased significantly, while those in the underground part decreased significantly. 【Conclusion】 Xinluzao 45 absorbs more Na than Lumianyan 24 under saline-alkali stress, which leads to a decrease in the selective absorption ability of plants to N, P, K, Ca and Mg plasma, and Lumianyan 24 has a stronger ability to transport various ions to overground parts than Xinluzao 45, thus improving its salt tolerance under saline-alkali stress.