PHYSIOLOGICAL RESPONSES OF 4 VARIETIES (LAGENARIA SICERARIA) GROWING IN VARIOUS NaCl CONCENTRATION

Abstract

In this study, using Knop solution supplemented with NaCl to create nutrient solutions with NaCl concentrations of 100 mM, 150 mM and 200 mM. Four gourd varieties (Langenaria siceraria) were used for physiological response research. After 15 days of growing in different concentrations of NaCl solution, the plants had marked physiological responses, including water exchange and mass of leaves, stems, roots. The water holding capacity of leaves is differentiated at the formula of 150, 200 mM NaCl. At 200 mM NaCl formula, the water holding capacity of the varieties ranged from 49.03% - 84.74% compared to the control. The amount of associated water in the leaves increased significantly when plants grow in saline conditions, reaching 128.47-381.08% compared to the control in the formula of 200 mM NaCl. Plant height was reduced in all treatments. The root length of the White and Japanese gourd varieties is significantly reduced at concentrations of NaCl 150 and 200 mM, Nam and Sao varieties were reduced in 200 mM NaCl formula. In the formula NaCl 100 and 150 mM, increase slightly, growing root length, reaching 114.05-117.41%. The dry weight of the Sao gourd’s root decreased the least (76.47% compared to the control), the White gourd seed decreased the most (55.22%) in the 200 mM NaCl formula. The total plant’s dry weight of the varieties decreased in the formula of 150 mM NaCl and 200 mM NaCl. Comparison between 4 varieties, Sao variety has the best ability to adapt to saline conditions in 4 studied varieties.