Leaf 13C and 15N composition shedding light on easing drought stress through partial K substitution by Na in eucalyptus species

Autor:	Antonio Leite Florentino, Ricardo Antunes Azevedo, Jessica Bezerra de Oliveira, Nikolas de Souza Mateus, Elcio Ferreira Santos, José Lavres, Francisco Scaglia Linhares, José Albertino Bendassolli, Mônica Lanzoni Rossi, Salete Aparecida Gaziola
Jazyk:	angličtina
Rok vydání:	2021
Předmět:	SÓDIO Science Plant physiology Drought tolerance chemistry.chemical_element Photosynthesis Article Dry weight Carbon Radioisotopes Water-use efficiency Stomata Eucalyptus Multidisciplinary Nitrogen Radioisotopes Drought Chemistry Sodium fungi food and beverages Carbon Dioxide Nitrogen Droughts Plant Leaves Horticulture Potassium Medicine Composition (visual arts)
Zdroj:	Scientific Reports, Vol 11, Iss 1, Pp 1-15 (2021) Scientific Reports Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP
ISSN:	2045-2322
Popis:	This work aimed to investigate the partial K-replacement by Na supply to alleviate drought-induced stress in Eucalyptus species. Plant growth, leaf gas exchange parameters, water relations, oxidative stress (H2O2 and MDA content), chlorophyll concentration, carbon (C) and nitrogen (N) isotopic leaf composition (δ13C and δ15N) were analyzed. Drought tolerant E. urophylla and E. camaldulensis showed positive responses to the partial K substitution by Na, with similar dry mass yields, stomatal density and total stomatal pore area relative to the well K-supplied plants under both water conditions, suggesting that 50% of the K requirements is pressing for physiological functions that is poorly substituted by Na. Furthermore, E. urophylla and E. camaldulensis up-regulated leaf gas exchanges, leading to enhanced long-term water use efficiency (WUEL). Moreover, the partial K substitution by Na had no effects on plants H2O2, MDA, δ13C and δ15N, confirming that Na, to a certain extent, can effectively replace K in plants metabolism. Otherwise, the drought-sensitive E. saligna species was negatively affected by partial K replacement by Na, decreasing plants dry mass, even with up-regulated leaf gas exchange parameters. The exclusive Na-supplied plants showed K-deficient symptoms and lower growth, WUEL, and δ13C, besides higher Na accumulation, δ15N, H2O2 and MDA content.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cceb3e512575d204ba9eec77e29d71d6 https://doaj.org/article/30ed5662e76a4a03bb84a3962e2ac414 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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