Impact of Salinity Stress on Germination of Water Spinach (Ipomoea aquatica)

Abstract

Aims: Salinity is one of the major abiotic stress that negatively affects plant growth in germination and early seedling stages. Salinity has becoming a serious problem as most of the parts of worldwide lands were affected by high salt concentration. Therefore, the effects of salinity ranging from 0 mM, 25 mM, 50 mM and 75 mM Sodium chloride (NaCl) concentrations on germination and early seedling growth of water spinach and their salt tolerance mechanism.
 Study Design: Completely Randomized Design (CRD).
 Place and Duration of Study: This study was conducted at Tissue Culture Laboratory, Department of Biology, Faculty of Science in University Putra Malaysia (UPM) from June to August, 2018.
 Methodology: In order to study the effects of salinity on water spinach, several parameters have been taken into account for measurement which include water uptake percentage, germination percentage, germination index, mean germination time, relative injury rate, seed vigor, seedling height reduction, hypocotyl and radicle length, seedling biomass, salt tolerance, total phenolic content and total flavonoids contents.
 Results: The results obtained showed that salinity adversely reduced water uptake efficiency, seed vigor, hypocotyl and radicle length, total phenolic content and total flavonoids content of water spinach. The seedling height reduction of water spinach increased significantly in relative to increasing salinity. However, seeds treated in mild salt concentration at 25 mM of NaCl showed an increment of germination percentage and germination index.
 Conclusion: Salt tolerance of water spinach increased as the response towards increasing salinity.

Comparing Salt Tolerance at Seedling and Germination Stages in Local Populations of Medicago ciliaris L. to Medicago intertexta L. and Medicago scutellata L.

“…The presence of NaCl also resulted in a significant decrease in germination in five legume species [29]. On the contrary, seeds exposed to a low concentration of 25 mM NaCl showed an increase in percent germination and germination index [30]. The coefficients of genotypic determination of six natural populations of a Fabaceae plant (Stylosanthes humilis) from three ecogeographic regions were high for five of the populations (except population Tamandaré) both for germination percentage (0.89) and germination rate (0.79), indicating the possibility of selection for salt tolerance in these populations [31].…”

“…The effects of salinity are mainly manifested by a slower vegetative growth [37]. The reduction in shoot and root growth by salt stress can be a consequence of unbalanced nutrient uptake by the seedlings; and the inhibition of shoot and root elongation is due to diminished water and essential mineral uptake by plants [15,30]. In general, salt stress inhibits the growth of shoots more than roots.…”

Efeito da salinidade na produção de mudas de pimentão

“…A germinação e o crescimento inicial de plântulas são considerados os estádios de desenvolvimento mais sensíveis à salinidade como é averiguado ao longo dos anos pelos autores: Freitas et al 2010;Nogueira et al 2012;Lopes et al 2015;Ibrahim et al 2019;Sá et al 2019). Os cuidados na fase de muda são fundamentais para se obter boa produtividade da cultura (ARÁUJO NETO et al 2009), uma vez que mudas de boa qualidade se desenvolvem melhor e consequentemente propiciam boa formação radicular com melhor capacidade de adaptação ao novo local, o que elevará a produção (SILVA et al 2019).…”

Impact of salinity Seed sprout characterization of five faba bean (Vicia faba L) varieties

“…Thus, salinity tolerance through sprouting is crucial for promotion of growing plants and under salt stress (Khan et al 2000). Despite, the sprouting importance for growing in saline soils, more is known of in stages of reproductive and vegetative about salt tolerance mechanism than during the sprouting stage (Ibrahim et al 2019 andMunns &Tester, 2008). Since excess chloride and sodium ions imbalance has a deleterious effect at all stages of plant growth (Begum et al 2013; Zhang et al 2010), therefore tolerance metabolism to Na + and Clis important during sprouting than later stages of plant growth, owing to limited carbohydrates available in seed (Zhang et al 2010).…”