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在100mmolL-1NaCl胁迫下,研究了外源NO供体硝普钠(SNP)处理对2个耐盐性不同的番茄(Lycopersicon esculentum Mill.)基因型幼苗根、茎和叶离子吸收和分布的影响。结果表明,外源NO显著降低盐胁迫下番茄幼苗根、茎和叶中Na+、Cl-含量,促进K+、Ca2+和Mg2+含量并提高K+/Na+、Ca2+/Na+和Mg2+/Na+值,促进根对K+、Ca2+的选择性吸收(SK/Na、SCa/Na)和K+、Ca2+向地上部的选择性运输(SK/Na、SCa/N)a。SNP单独处理时对以上各指标没有显著影响。在相同的处理条件下,盐敏感品种的Na+、Cl-在根、茎和叶中累计量均低于耐盐品种,而K+、Ca2+和Mg2+的累计相反;根向介质吸收SK/Na、SCa/Na,向茎、叶运输的SK/Na、SCa/Na值均较低。以上结果表明,外源NO能通过降低离子毒害,改善植株体内的养分平衡,缓解NaCl胁迫对番茄幼苗造成的伤害,增强番茄幼苗的耐盐能力。
Effects of Exogenous Nitric Oxide Donor Sodium Nitroprusside (SNP) Treatment on Ion Absorption and Distribution of Roots, Stems and Leaves of Two Lycopersicon esculentum Mill. Seedlings under 100mmol L-1 NaCl Stress . The results showed that exogenous NO significantly decreased Na + and Cl- content, K +, Ca2 + and Mg2 + content and K + / Na +, Ca2 + / Na + and Mg2 + / Na + contents in roots, stems and leaves of tomato seedlings under salt stress, Selective Uptake of K +, Ca2 + (SK / Na, SCa / Na) and K +, Ca2 + Upstream Selective Transportation (SK / Na, SCa / N) a. SNP alone did not significantly affect the above indicators. Under the same treatment conditions, the accumulation of Na + and Cl- in salt-sensitive cultivars was lower than that in salt-tolerant cultivars, while K +, Ca2 + and Mg2 + accumulated in opposite directions. The absorption of SK / Na and SCa / Na, the SK / Na and SCa / Na values of stem and leaf transport were lower. The above results show that exogenous NO can alleviate the damage caused by NaCl stress to tomato seedlings and enhance the salt tolerance of tomato seedlings by reducing the poisoning of ions and improving the nutrient balance in plants.