Differential growth and yield responses of salt-tolerant and susceptible rice cultivars to individual (Na+ and Cl-) and additive stress effects of NaCl
Differential growth and yield responses of salt-tolerant and susceptible rice cultivars to individual (Na+ and Cl-) and additive stress effects of NaCl
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DOI：
10.1007/s11738-016-2191-x
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发表时间：
2016-06-01
影响因子：
2.6
通讯作者：
Khare, Tushar
中科院分区：
文献类型：
--
作者：
Kumar, Vinay;Khare, Tushar
评价了钠离子（Na+）和氯离子（Cl-）对水稻生长和产量降低的负面影响以及它们可能的加性效应（NaCl下），同时研究了耐盐基因型是否比敏感基因型有不同的反应。虽然Na+和Cl-离子在NaCl胁迫下都在植物组织中积累，但历史上大多数研究的目的是解释Na+离子诱导的有害效应。因此，生理和分子机制涉及氯毒性不清楚作物植物。为了解决这些问题，两个水稻品种，Panvel-3（耐受）和Sahyadri-3（敏感）的65天大的植物进行Cl-，Na+和NaCl（每100 mM的浓度和电导率约为10 dS m（-1））胁迫使用土壤为基础的系统。维持胁迫条件直至收获成熟（128天龄）植物。3种处理对小麦生长、干物质、产量构成因素（每穗粒数、籽粒长、宽、厚、重、沿着和结实率）和总产量均产生显著的拮抗效应，其中NaCl处理的影响大于其组成离子。盐胁迫引起了还原糖、蛋白质、淀粉和脯氨酸含量的失衡，其中以NaCl处理的失衡幅度最大。Cl-/Na+积累量与作物产量呈负相关，敏感品种的严重程度较高。在NaCl中观察到的毒性的总体幅度最高，其次是Na+和Cl-，分别表明在NaCl下的组成离子的加性效应。两个品种的反应相似，但是，与敏感品种不同，耐受品种保持Na+：K+比
Negative impacts exerted by sodium (Na+) and chloride (Cl-) ions individually as well their possible additive effects (under NaCl) were evaluated on growth and yield reductions in rice, besides investigating whether salt-tolerant genotypes respond differentially than their sensitive counterparts. Though both Na+ and Cl- ions get accumulated in plant tissues under NaCl stress, most research has historically been aimed to decipher harmful effects induced by Na+ ions. Accordingly, physiological and molecular mechanisms involved in Cl-toxicity are not clearly understood in crop plants. To address these issues, 65-day-old plants of two rice cultivars, Panvel-3 (tolerant) and Sahyadri-3 (sensitive) were subjected to Cl-, Na+ and NaCl (each with 100 mM concentration and electrical conductivity of approximate to 10 dS m(-1)) stress using soil-based systems. Stress conditions were maintained till harvesting of mature (128-day-old) plants. All three treatments induced substantial antagonistic effects on growth, dry mass, yield components (number of grains per panicle, length, width, thickness and weight of grain, along with the percentage of grains filled) and overall crop yield, with greater impacts under NaCl than its constituent ions. Salinity treatments caused an imbalance in reducing sugars, protein, starch and proline contents, with the greatest magnitude under NaCl. A negative correlation between Cl-/Na+ accumulation and crop yield was witnessed, with higher severity on the sensitive cultivar. The overall magnitude of toxicity was observed highest in NaCl followed by Na+ and Cl-, respectively, suggesting additive effects of constituent ions under NaCl. Both cultivars responded similarly; however, the tolerant cultivar, unlike the sensitive one, kept Na+:K+ ratio