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Bonacina Cristine,Nascimento Andressa Bezerra,Barbosa Letícia Neris,de Souza Silvia Graciele Hülse,Magalhães Hélida Mara 한국작물학회 2023 Journal of crop science and biotechnology Vol.26 No.2
During cultivation, environmental factors can cause changes in the metabolism of Curcuma longa L. that limit its development. This study evaluated the efects of diferent sodium chloride (NaCl) concentrations on the leaf anatomy, stomatal features, and biochemical activity of C. longa L. plants. The experiment was conducted in a greenhouse, using rhizomes of C. longa L. planted in plastic pots containing soil, sand, and organic matter (2:1:1). After 180 days of planting, salt stress using NaCl (50, 100, and 150 mM) was induced and a control treatment was made with water. At 150 days post treatment, the morphoanatomical variables of the leaves were evaluated, and biochemical analyses of the leaves and rhizomes were performed. The leaves exposed to intermediate salt concentrations (50 and 100 mM) had fewer hypodermic cells and larger spaces between the cells in the spongy parenchyma. In the 150 mM NaCl group, there was an increase in the total leaf thickness caused by an increase in hypodermic cells. The percentage of closed stomata increased in the 50 mM (85%) and 100 mM (80%) NaCl treatments, and the polar diameter of the cells (1.22%) was reduced in the presence of 150 mM NaCl. Biochemical analyses revealed diferent responses for rhizomes and leaves. The total sugars in the rhizomes increased in the presence of ≥50 mM NaCl, probably because of the need to generate more energy for use in secondary metabolite synthesis pathways. The antioxidative activity and phenolic compounds also increased at the highest NaCl concentrations. In conclusion, we have classifed C. longa L. as a plant that is tolerant to saline stress, owing to the metabolic balance and water-loss barrier provided by the rhizome to mitigate stress damage. Our results showed that C. longa L. plants were tolerant to the high salt concentrations tested in this study (100 and 150 mM).
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