Combined effect of NaCl-salinity and hypoxia on growth, photosynthesis, water relations and solute accumulation in Phragmites australis plants
Combined effect of NaCl-salinity and hypoxia on growth, photosynthesis, water relations and solute accumulation in Phragmites australis plants
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DOI：
10.1016/j.flora.2009.12.021
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发表时间：
2010-01-01
期刊：
影响因子：
1.9
通讯作者：
Neffati, Mohamed
中科院分区：
文献类型：
--
作者：
Gorai, Mustapha;Ennajeh, Mustapha;Neffati, Mohamed
研究了河口生态系统中的两个关键环境因子--盐度和低氧对芦苇（Phragmites australis（Cav.）Trin.来自Steudel）。生长，叶气体交换，水（和离子）的关系，和渗透调节在水培生长的植物暴露于缺氧在不同的NaCl-盐度浓度（0，50，100，和200 mM）。植物生长良好，缺氧处理下，没有添加盐和NaCl浓度高达100 mM的标准营养液。芦苇植物能够产生和分配植物体的所有器官，即使在最高盐水平（200 mM NaCl）。在植物缺氧在不同的水势没有明确的关系，发现生长和光合参数之间的关系，除了g（s），而生长表现出高度显着的相关性与植物-水的关系。在不同营养液水势条件下，低氧处理芦苇的A与g（s）呈显著正相关，A与E也呈显著正相关。叶片Psi（W）和Psi（pi）遵循类似的趋势，并随着水分溶液的水势降低而显著下降。叶片Psi（M）与光合参数呈极显著正相关。在所有NaCl浓度下，总无机离子的增加导致增加Na+和Cl-，而K+，Ca 2+，Mg 2+浓度随营养液渗透压的增加而降低。芦苇叶片具有有效的Na+排斥机制，在低氧条件下，在较宽的盐度范围内，芦苇叶片均表现出较高的K+/Na+选择性。在芦苇生长在200 mM NaCl，K+贡献了17%的Psi（PI），而Na+和Cl-仅占11%和6%，分别。在相同的NaCl浓度下，脯氨酸对Psi（pi）的贡献小于0.2%.叶片膨压的变化是在盐和低氧的共同作用下发生的，表明芦苇能够充分调节自身的水分状况。(C)2010年由Elsevier GmbH出版。
Aim of the present study was to investigate the effects of two key environmental factors of estuarine ecosystems, salinity and hypoxia, on the physiological attributes in reed plants (Phragmites australis (Cav.) Trin. ex Steudel). Growth, leaf gas exchange, water (and ion) relations, and osmotic adjustment were determined in hydroponically grown plants exposed to hypoxia at varying NaCl-salinity concentrations (0, 50, 100, and 200 mM). Plants grew well under hypoxia treatment with standard nutrient solution without added salt and at NaCl concentrations up to 100 mM. Reed plants were able to produce and allocate phytomass to all their organs even at the highest salt level (200 mM NaCl). In plants subjected to hypoxia at various water potentials no clear relationships were found between growth and photosynthetic parameters except for g(s), whereas growth displayed a highly significant correlation with plant-water relations. A and g(s) of reed plants treated with hypoxia at varying water potential of nutrient solutions were positively correlated and the former variable also had a strong positive relationship with E. Leaf Psi(W) and Psi(pi) followed a similar trend and declined significantly as water potential of watering solutions was lowered. Highly significant positive correlations were identified between leaf Psi(M) and photosynthetic parameters. At all NaCl concentrations, the increase in total inorganic ions resulted from increased Na+ and Cl- while K+, Ca2+, and Mg2+ concentrations decreased with increasing osmolality of nutrient solutions. Common reed has an efficient mechanism of Na+ exclusion from the leaves and exhibited a high leaf K+/Na+ selectivity ratio over a wide range of salinities under hypoxia treatment. In Phragmites australis grown in 200 mM NaCl, K+ contributed 17% to Psi(pi), whereas Na+ and Cl- accounted for only 11% and 6%, respectively. At the same NaCl concentration, the estimated contribution of proline to Psi(pi) was less than 0.2%. Changes in leaf turgor occurred with a combined effect of salinity and hypoxia, suggesting that reed plants could adjust their water status sufficiently. (C) 2010 Published by Elsevier GmbH.