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以一年生实生白刺(Nitraria tangutorum)幼苗为实验材料,设置四种组分(中性盐Na Cl、Na2SO4(1:1)、碱性盐Na HCO3、Na2CO3(1:1)、混合盐碱Na Cl、Na2SO4、Na HCO3、Na2CO3(1:1:1:1)和单盐Na Cl和四个浓度梯度(100、200、300、400mmol/L)的盐碱组成来模拟大田的盐碱土,对白刺(N.tangutorum)的耐盐性进行盆栽试验研究。试验结果表明:白刺(N.tangutorum)幼苗可以耐受不超过300mmol/L的四种组分盐碱胁迫,随着处理浓度的升高,白刺(N.tangutorum)幼苗的细胞膜透性逐渐增加,膜质过氧化程度加剧,SOD及POD保护酶活性逐渐降低。白刺根、茎、叶中的Na+含量和Na+/K+随着处理浓度的增大呈上升的趋势,K+含量则逐渐下降,白刺体内根、茎、叶3个部位中Na+、K+含量和Na+/K+大小顺序依次为叶>茎>根。另外,不同组分盐碱胁迫下,白刺(N.tangutorum)幼苗的生长状态存在差异,高浓度碱性盐胁迫下最早出现植株萎蔫症状,且相对生长量较低,表明白刺(N.tangutorum)对不同组分的盐碱胁迫具有不同的耐盐性,碱对其危害更大。
Nitraria tangutorum seedlings were used as experimental materials and four components (neutral salt Na Cl, Na2SO4 (1: 1), basic salt Na HCO3, Na2CO3 (1: 1) Saline-alkaline soil in the field was simulated by using NaCl, Cl, Na2SO4, NaHC03, Na2CO3 (1: 1: 1: 1) and single salt NaCl and four concentration gradients (100, 200, 300 and 400 mmol / L) The salt tolerance of N. tangutorum was studied in pot experiments.The results showed that the seedlings of N. tangutorum could tolerate salt-alkali stress of four components with no more than 300 mmol / L, The membrane permeability of N. tangutorum seedlings increased gradually, the degree of membranous peroxidation increased and the activities of protective enzymes of SOD and POD gradually decreased. The contents of Na + and Na + / K + The content of Na +, K + and Na + / K + in the roots, stems and leaves of the Nitraria tangutorum had the order of leaf> stem> root in the order of increasing concentration and K + content. In addition, Under salt - alkali stress, the growth of N. tangutorum seedlings was different, and the wilting symptom was the earliest under high concentration alkaline salt stress, The lower amount of long, indicating that N. tangutorum different components of salt-alkali stress have different salt tolerance, alkali harder.