Effect of salinity on osmolytes and relative water content of selected rice genotypes

Polash, Mohammed Arif Sadik; Sakil, Md. Arif; Tahjib-Ul-Arif, Md.; Hossain, Md. Alamgir

doi:10.22271/tpr.2018.v5.i2.029

Cited by 53 publications

(32 citation statements)

References 26 publications

(35 reference statements)

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“…Similar results have been obtained for sugar beet grown under 250 mM salt stress [ 60 ]. The decrease in LRWC can result in a high accumulation of salt in the rhizosphere, which impedes water uptake by the roots [ 61 ]. Studies by Yildirim et al [ 62 , 63 ] and Sayyari et al [ 64 ] found that spraying with exogenous GB and exogenous SA increased LRWC in lettuce subjected to water stress and salt stress, results which are consistent with the data shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

Responses of leaf gas exchange attributes, photosynthetic pigments and antioxidant enzymes in NaCl-stressed cotton (Gossypium hirsutum L.) seedlings to exogenous glycine betaine and salicylic acid

et al. 2020

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Background Application of exogenous glycine betaine (GB) and exogenous salicylic acid (SA) mitigates the adverse effects of salinity. Foliar spraying with exogenous GB or SA alleviates salt stress in plants by increasing leaf gas exchange and stimulating antioxidant enzyme activity. The effects of foliar application of exogenous GB and SA on the physiology and biochemistry of cotton seedlings subjected to salt stress remain unclear. Results Results showed that salt stress of 150 mM NaCl significantly reduced leaf gas exchange and chlorophyll fluorescence and decreased photosynthetic pigment quantities and leaf relative water content. Foliar spray concentrations of 5.0 mM exogenous GB and 1.0 mM exogenous SA promoted gas exchange and fluorescence in cotton seedlings, increased quantities of chlorophyll pigments, and stimulated the antioxidant enzyme activity. The foliar spray also increased leaf relative water content and endogenous GB and SA content in comparison with the salt-stressed only control. Despite the salt-induced increase in antioxidant enzyme content, exogenous GB and SA in experimental concentrations significantly increased the activity of glutathione reductase, ascorbate peroxidase, superoxide dismutase, catalase and peroxidase, and decreased malondialdehyde content under salt stress. Across all experimental foliar spray GB and SA concentrations, the photochemical efficiency of photosystem II (FV/FM) reached a peak at a concentration of 5.0 mM GB. The net photosynthetic rate (Pn) and FV/FM were positively correlated with chlorophyll a and chlorophyll b content in response to foliar spraying of exogenous GB and SA under salt stress. Conclusions We concluded, from our results, that concentrations of 5.0 mM GB or 1.0 mM SA are optimal choices for mitigating NaCl-induced damage in cotton seedlings because they promote leaf photosynthesis, increase quantities of photosynthetic pigments, and stimulate antioxidant enzyme activity. Among, 5.0 mM GB and 1.0 mM SA, the best performance in enhancing endogenous GB and SA concentrations was obtained with the foliar application of 1.0 mM SA under salt stress.

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Section: Discussionmentioning

confidence: 99%

Responses of leaf gas exchange attributes, photosynthetic pigments and antioxidant enzymes in NaCl-stressed cotton (Gossypium hirsutum L.) seedlings to exogenous glycine betaine and salicylic acid

et al. 2020

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“…2a). Under salinity condition, the accumulation of proline showed increasing trend in rice (Polash et al 2018), Hordeum vulgare (Reza et al 2006), Pisum sativum (Ozturk et al 2012) and Trifolium alexandrinum (Abdalla 2011). Proline may act as a non-toxic osmotic solute preferentially stabilizing the structure of macromolecules and organelles (Acosta-Motos et al 2019).…”

Section: Discussionmentioning

confidence: 99%

Physiological mechanisms of exogenous calcium on alleviating salinity-induced stress in rice (Oryza sativa L.)

Roy

Tahjib‐Ul‐Arif

Polash

et al. 2019

Physiol Mol Biol Plants

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Being more sensitive to salt stress among the cereals, growth of rice (Oryza sativa L.) has been habitually affected by salinity. Although, several practices have evolved to sustain the growth of rice under salinity, the enormous role of calcium (Ca 2?) as a signalling molecule in salt stress mitigation is still arcane. Considering this fact, an experiment was performed aiming to explicate the mechanism of salt-induced growth inhibition in rice and its alleviation by exogenous Ca 2?. At germination stage, 10 mM and 15 mM CaCl 2 primed rice (cv. Binadhan-10 & Binadhan-7) seeds were grown in petri dishes for 9 days under 100 mM NaCl stress. At seedling stage, 9-day-old rice seedlings grown on sand were exposed to 100 mM NaCl alone and combined with 10 mM and 15 mM CaCl 2 for 15 days. This research revealed that salinity radically slowed down growth of rice seedlings and Ca 2? treatment noticeably improved growth performances. At germination stage, 10 mM CaCl 2 treatment significantly increased the final germination percentage, germination rate index (in Binadhan-7), shoot, root length (89.20, 67.58% in Bindhan-10 & 84.72, 31.15% in Bindhan-7) and biomass production under salinity. Similarly, at seedling stage, 10 mM CaCl 2 supplementation in salt-stressed plants enhanced shoot length (42.17, 28.76%) and shoot dry weight (339.52, 396.20%) significantly in Binadhan-10 & Binadhan-7, respectively, but enhanced root dry weight (36.76%) only in Binadhan-10. In addition, 10 mM CaCl 2 supplementation on salt-stressed seedlings increased the chlorophyll and proline content, and oppressed the accretion of reactive oxygen species thus protecting from oxidative damage more pronouncedly in Binadhan-10 than Binadhan-7 as reflected by the elevated levels of catalase and ascorbate peroxidase activity. The 15 mM CaCl 2 somehow also enhanced some growth parameters but overall was less effective than 10 mM CaCl 2 to alleviate salt stress, and sometimes showed negative effect. Therefore, supplementary application of calcium-rich fertilizers in saline prone soils can be an effective approach to acclimatize salt stress and cultivate rice successfully.

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“…Therefore, another possible reason for the reduced growth rate in maize genotypes under salt stress may be associated with the reduced RWC and induced water deficit index in the leaves. In addition, closure of the stomata and further disruption of the transpiration stream as result of water deficit-induced stimulation of abscisic acid synthesis may be indirectly responsible for the reduced growth rate in the salt-stressed maize genotypes used in this study (Polash et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

Effects of salt stress on physiological and biochemical responses of three maize genotypes at the early seedling stage

Doğru

2021

AAS

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Salt stress is one of the major global problems for crop productivity in the arid and semi-arid regions of the world. In this study, variations in some physiological parameters, water relations, and antioxidant systems under salinity (300 mM NaCl) among three maize (Zea mays L.) genotypes (‘P3167’, ‘32K61’, and ‘Bora’) were investigated. Our result indicated that shoot growth is more sensitive to salinity as compared to root growth. Salt stress led to physiological drought in all maize genotypes as indicated by the significant decrease in relative water content and increase in water deficit index. Salt stress increased SOD activity in all genotypes showing an efficient formation and detoxification of superoxide radical. The constant level of oxidative markers (MDA and H2O2) and the increased level of the reduced ascorbate and phenolic may indicate that non-enzymatic antioxidants are responsible for the elimination of oxidative stress. Changes in ascorbate peroxidase and glutathione reductase activities under salinity demonstrated a functional failure in the ascorbate-glutathione cycle, especially in ‘P3167’ and ‘32K61’. Based on the presented results we may conclude that the genotype ‘Bora’ is tolerant to salinity while ‘P3167’ and ‘32K61’ are sensitive.

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Effect of salinity on osmolytes and relative water content of selected rice genotypes

Cited by 53 publications

References 26 publications

Responses of leaf gas exchange attributes, photosynthetic pigments and antioxidant enzymes in NaCl-stressed cotton (Gossypium hirsutum L.) seedlings to exogenous glycine betaine and salicylic acid

Responses of leaf gas exchange attributes, photosynthetic pigments and antioxidant enzymes in NaCl-stressed cotton (Gossypium hirsutum L.) seedlings to exogenous glycine betaine and salicylic acid

Physiological mechanisms of exogenous calcium on alleviating salinity-induced stress in rice (Oryza sativa L.)

Effects of salt stress on physiological and biochemical responses of three maize genotypes at the early seedling stage

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