Importance of Physiological Traits Vulnerability in Determine Halophytes Tolerance to Salinity Excess: A Comparative Assessment in Atriplex halimus

被引:14
|
作者
Alberto Perez-Romero, Jesus [1 ]
Mateos-Naranjo, Enrique [1 ]
Lopez-Jurado, Javier [1 ]
Redondo-Gomez, Susana [1 ]
Torres-Ruiz, Jose M. [2 ]
机构
[1] Univ Seville, Fac Biol, Dept Biol Vegetal & Ecol, Av Reina Mercedes S-N, Seville 41012, Spain
[2] Univ Clermont Auvergne, PIAF, INRA, F-63000 Clermont Ferrand, France
来源
PLANTS-BASEL | 2020年 / 9卷 / 06期
关键词
halophyte; specific conductivity; turgor loss point; photosynthesis; chlorophyll fluorescence; CORDGRASS SPARTINA-DENSIFLORA; WATER RELATIONS; SALT TOLERANCE; PHOTOSYNTHETIC RESPONSES; COASTAL POPULATION; EXTREME HALOPHYTE; ION ACCUMULATION; GROWTH; DROUGHT; STRESS;
D O I
10.3390/plants9060690
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Many halophytic physiological traits related to the tolerance of plants to salinity excess have been extensively studied, with a focus on biomass and/or gas exchange parameters. To gain a more complete understanding of whether salinity excess affects the physiological performance of halophytes, an experiment was performed using the halophyte Atriplex halimus L. as a model. A. halimus plants were subjected to two salinity treatments (171 and 513 mM NaCl) over 60 days in a controlled environment. After this period, dry biomass, specific stem conductivity, water potential at turgor loss point, osmotic potential, gas exchange parameters, and the fluorescence of chlorophyll a derived parameters were assessed in order to obtain knowledge about the differences in vulnerability that these parameters can show when subjected to salinity stress. Our results showed a decrease in belowground and aboveground biomass. The decrement in biomass seen at 513 mM NaCl was related to photosynthetic limitations and specific stem conductivity. Turgor loss point did not vary significantly with the increment of salinity. Therefore, the parameter that showed less vulnerability to saline stress was the turgor loss point, with only a 5% decrease, and the more vulnerable trait was the stem conductivity, with a reduction of nearly 50%.
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页数:11
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