Germination of Dypsis decaryi seeds under salt stress at two seasons
DOI:
https://doi.org/10.5433/1679-0359.2023v44n3p945Keywords:
Abiotic stress, Arecaceae, KCl, NaCl, Ornamental plantAbstract
The triangle palm (Dypsis decaryi), native to Madagascar and threatened in its habitat, presents several characteristics of ornamental interest, making it a valuable species for the international market. The main propagation method of this plant is by seed which is influenced by several factors such as sowing time and salinity. The seasonal variation of environmental factors at different sowing times can influence the germination process while saline stress can cause a decrease in germination and even seedling death, affecting seedling production. Thus, the objective of this work was to evaluate the germination behavior of Dypsis decaryi seeds in different saline concentrations of sodium chloride (NaCl) and potassium chloride (KCl) at two different seasons. The experimental design was entirely randomized. There were four repetitions, in a 2 × 2 × 5 factorial scheme, two seasons (summer and winter), two types of salts (NaCl and KCl) and four salt concentrations (25, 50, 75 and 100 mM) and no salt - control. The following variables were analyzed: germination rate, germination speed index, and mean germination time. The species proved to be tolerant to simulated salinity by NaCl and KCl during the process of seed germination, which was influenced by sowing time, salt concentrations and interaction between seasons and concentrations. There was no isolated significant effect between the types of salts, for the interaction between seasons and salts, and among the three factors evaluated.
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