Nitric Oxide Regulates Plant Growth, Physiology, Antioxidant Defense, and Ion Homeostasis to Confer Salt Tolerance in the Mangrove Species, Kandelia obovata.
Nitric Oxide Regulates Plant Growth, Physiology, Antioxidant Defense, and Ion Homeostasis to Confer Salt Tolerance in the Mangrove Species, Kandelia obovata.
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一氧化氮调节植物生长、生理、抗氧化防御和离子稳态，从而赋予红树植物秋茄（Kandelia obovata）耐盐性。
DOI：
10.3390/antiox10040611
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发表时间：
2021-04-16
期刊：
影响因子：
--
通讯作者：
Oku H
中科院分区：
文献类型：
--
作者：
Hasanuzzaman M;Inafuku M;Nahar K;Fujita M;Oku H
兼性盐生植物秋茄（Kandelia obovata）植株在有或没有硝普钠（SNP；100 μM；一种一氧化氮供体）、血红蛋白（Hb，100 μM；一种一氧化氮清除剂）或Nω - 硝基 - L - 精氨酸甲酯（L - NAME，100 μM；一种一氧化氮合酶抑制剂）的情况下，分别暴露于轻度（1.5% NaCl）和重度（3% NaCl）盐胁迫下。植株受到重度盐胁迫的显著影响。它们表现出幼苗生长、气孔导度、细胞间二氧化碳浓度、SPAD值、光合速率、蒸腾速率、水分利用效率下降，抗氧化防御系统被破坏，活性氧物质过量产生以及可见的氧化损伤。盐胁迫还诱导了离子毒性并破坏了营养平衡，表现为叶片和根部的Na⁺含量升高，K⁺含量降低，K⁺/Na⁺比值降低，Ca含量降低，同时渗透调节物质（脯氨酸）水平升高。用SNP处理盐胁迫植株提高了内源一氧化氮水平，降低了离子毒性，改善了营养平衡，同时进一步提高脯氨酸水平以维持渗透平衡。SNP处理还改善了气体交换参数并增强了抗氧化酶（过氧化氢酶、抗坏血酸过氧化物酶、单脱氢抗坏血酸还原酶和脱氢抗坏血酸还原酶）的活性。用Hb和L - NAME处理逆转了SNP的这些有益效果并加剧了盐害，证实了SNP促进了盐胁迫下的胁迫恢复并改善了植物生长。
Facultative halophyte Kandelia obovata plants were exposed to mild (1.5% NaCl) and severe (3% NaCl) salt stress with or without sodium nitroprusside (SNP; 100 µM; a NO donor), hemoglobin (Hb, 100 µM; a NO scavenger), or Nω-nitro-L-arginine methyl ester (L-NAME, 100 µM; a NO synthase inhibitor). The plants were significantly affected by severe salt stress. They showed decreases in seedling growth, stomatal conductance, intercellular CO2 concentration, SPAD value, photosynthetic rate, transpiration rate, water use efficiency, and disrupted antioxidant defense systems, overproduction of reactive oxygen species, and visible oxidative damage. Salt stress also induced ion toxicity and disrupted nutrient homeostasis, as indicated by elevated leaf and root Na+ contents, decreased K+ contents, lower K+/Na+ ratios, and decreased Ca contents while increasing osmolyte (proline) levels. Treatment of salt-stressed plants with SNP increased endogenous NO levels, reduced ion toxicity, and improved nutrient homeostasis while further increasing Pro levels to maintain osmotic balance. SNP treatment also improved gas exchange parameters and enhanced antioxidant enzymes’ activities (catalase, ascorbate peroxidase, monodehydroascorbate reductase, and dehydroascorbate reductase). Treatment with Hb and l-NAME reversed these beneficial SNP effects and exacerbated salt damage, confirming that SNP promoted stress recovery and improved plant growth under salt stress.
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影响因子：
3.2
作者：
Dong, Yuanjie;Xu, Linlin;Bai, Xiaoying
通讯作者：
Bai, Xiaoying
影响因子：
3.8
作者：
Groppa, M. D.;Rosales, E. P.;Benavides, M. P.
通讯作者：
Benavides, M. P.
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影响因子：
6.5
作者：
Huang, Jie;Zhu, Chunquan;Zhang, Junhua
通讯作者：
Zhang, Junhua
影响因子：
2.9
作者：
Khan, M. Iqbal R.;Iqbal, Noushina;Khan, Nafees A.
通讯作者：
Khan, Nafees A.
影响因子：
3.1
作者：
Ahmad, P.;Nabi, G.;Ashraf, M.
通讯作者：
Ashraf, M.