Abstract
Rice is an important staple food in Indonesia. Crop areas can be expanded to boost productivity by utilizing marginal lands, which are saline. This study aims to study the growth and physiological response of rice ‘Inpari 35’ to the application of silicate fertilizer under salinity stress conditions. This study used a completely randomized design (CRD) with two factors. The first factor is the difference in NaCl salt concentration consisting of N0: 0 mM; N1: 37.5 mM; N2: 50 mM, while the second factor is the difference in the concentration of silicate fertilizer (CaSiO3) consisting of S0: 0 mM; S1: 1 mM and S2: 2 mM. Each treatment combination was repeated three times. Observed data were analyzed by analysis of variance (ANOVA). A significant difference between treatments is continued with Duncan's multiple distance test at a 95% confidence level. The results showed that NaCl treatment significantly (p<0.05) inhibited the growth of rice ‘Inpari 35’, which was indicated by a decrease in the plant height and number of leaves. The NaCl treatment caused a reduction in the levels of chlorophyll, carotenoids, proline, membrane stability index (MSI), and relative water content (RWC). The interaction between NaCl treatment and CaSiO3 showed significant differences in physiological parameters by increasing the levels of chlorophyll, carotenoid, proline, membrane stability index, and relative water content.
Highlights
Rice is a food crop commodity that produces rice, the staple food in Indonesia
‘Inpari 35’ rice seeds cultivar obtained from Indonesian Center for Rice Research (ICRC)
The first factor is the difference in NaCl concentration consisting of N0: 0 mM; N1: 37.5 mM; N2: 50 mM, while the second factor is the difference in CaSiO3 concentration consisting of S0: 0 mM; S1: 1 mM; and S2: 2 mM
Summary
Rice is a food crop commodity that produces rice, the staple food in Indonesia. the change in land use causes rice production to decline (Jiang et al, 2013; Suhartini & Harjosudarmo, 2017). One way to increase rice production is by expanding the planted area on marginal lands (Swinton et al, 2011; Hussain et al, 2019), one of which is saline land. The area of saline land will increase due to the decrease in water quality and rainfall. Salinity-tolerant rice cultivars are needed to take advantage of these marginal lands. Salinity is one of the factors that constrain rice plant growth and production due to the high concentration of sodium chloride (NaCl) in the growing medium, which can interfere with plant physiological processes, affecting osmotic pressure and nutrient balance (Ghosh et al, 2011; Das et al, 2015; Reddy et al, 2017). High salinity levels can induce chloroplast damage which causes a reduction in chlorophyll content and photosynthetic capacity (Rad et al, 2012; Gao et al, 2015)
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