Journal
PLANT PHYSIOLOGY AND BIOCHEMISTRY
Volume 158, Issue -, Pages 385-395Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2020.11.026
Keywords
Gas exchange; Proline; Saline stress; Sodium recirculation; Starch; Sugar metabolism
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Funding
- Fundacao de Amparo a Ciencia e Tecnologia do Estado de Pernambuco [APQ/PRONEM-FACEPE -0336-2.03/14]
- Coordenacno de Aperfeicoamento de Pessoal de Nivel Superior -Brazil (CAPES) [001]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
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The study showed that Cenostigma pyramidale utilizes Na+ recirculation mechanisms to endure salt stress, with gas exchange and carbon metabolism being affected differently depending on the time in the day when the stress began. Morning-stressed plants exhibited more damage in terms of synthesized proline, H2O2, and malondialdehyde compared to night-stressed plants.
Basic mechanisms are known to promote salt tolerance in plants: a delay in Na+ uptake or rapid Na+ remobilization from leaf tissue. We measured dynamics of the Na+/K+ ratio and components of carbon metabolism during the first 72 h after saline stress (200 mM NaCl) began in Cenostigma pyramidale, a woody species, under controlled conditions. Saline stress at two times: one plant group at the beginning of the morning and the other in the evening. Stressed plants had three times more Na+ in leaves than did control plants in the first 24 h. However, in the next few hours, despite new applications of saline solution, the Na+/K+ ratio continued to decline. Several samples, including night treatments, provided evidence that this species uses Na+ recirculation mechanisms to endure salt stress. Effects of salt on the traits evaluated differed depending on the time when stress began. Between the two saline treatments, in the first 24 h after saline stress, gas exchange decreased more strongly in morning-stressed plants, when large amounts of Na+ reached the leaf and K+ left this organ. Nevertheless, when stress was applied in the evening, leaf Na+ remobilization was faster, and the soluble sugar/starch ratio remained greater than did the control. Our data suggested that time of the beginning of salt stress could change the level of damage. Morning-stressed plants synthesized greater amounts of proline, H2O2, and malondialdehyde than did night-stressed plants. We recommend that details regarding the time of stress be taken into consideration in physiological studies.
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