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• W3136172719 abstract "Eucalyptus , the most widely planted tree genus worldwide, is frequently cultivated in soils with low water and nutrient availability. Sodium (Na) can substitute some physiological functions of potassium (K), directly influencing plants’ water status. However, the extent to which K can be replaced by Na in drought conditions remains poorly understood. A greenhouse experiment was conducted with three Eucalyptus genotypes under two water conditions (well-watered and water-stressed) and five combination rates of K and Na, representing substitutions of 0/100, 25/75, 50/50, 75/25, and 100/0 (percentage of Na/percentage of K), to investigate growth and photosynthesis-related parameters. This study focused on the positive effects of Na supply since, depending on the levels applied, the Na supply may induce plants to salinity stress (&gt;100 mM of NaCl). Plants supplied with low to intermediate K replacement by Na reduced the critical level of K without showing symptoms of K deficiency and provided higher total dry matter (TDM) than those Eucalyptus seedlings supplied only with K in both water conditions. Those plants supplied with low to intermediate K replacement by Na had improved CO 2 assimilation ( A ), stomatal density (Std), K use efficiency (UE K ), and water use efficiency (WUE), in addition to reduced leaf water potential ( Ψ w) and maintenance of leaf turgidity, with the stomata partially closed, indicated by the higher values of leaf carbon isotope composition (δ 13 C‰). Meanwhile, combination rates higher than 50% of K replacement by Na led to K-deficient plants, characterized by the lower values of TDM, δ 13 C‰, WUE, and leaf K concentration and higher leaf Na concentration. There was positive evidence of partial replacement of K by Na in Eucalyptus seedlings; meanwhile, the ideal percentage of substitution increased according to the drought tolerance of the species ( Eucalyptus saligna &lt; Eucalyptus urophylla &lt; Eucalyptus camaldulensis )." @default.
• W3136172719 created "2021-03-29" @default.
• W3136172719 creator A5017263449 @default.
• W3136172719 creator A5022896045 @default.
• W3136172719 creator A5040307835 @default.
• W3136172719 creator A5046347263 @default.
• W3136172719 creator A5069050481 @default.
• W3136172719 creator A5084969130 @default.
• W3136172719 date "2021-03-15" @default.
• W3136172719 modified "2023-10-06" @default.
• W3136172719 title "Partial Substitution of K by Na Alleviates Drought Stress and Increases Water Use Efficiency in Eucalyptus Species Seedlings" @default.
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