Inducing drought tolerance in greenhouse grown Juglans regia by imposing controlled salt stress: The role of osmotic adjustment

Karimi, Soheil; Karami, Hadis; Mokhtassi‐Bidgoli, Ali; Tavallali, Vahid; Vahdati, Kourosh

doi:10.1016/j.scienta.2018.05.029

Cited by 34 publications

(16 citation statements)

References 49 publications

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“…In addition to their role in osmoregulation, soluble sugars act as a source of energy and protect the photosynthetic system by Na + sequencing compound. In this study, salinity stress enhanced proline and CHOs accumulation in the studied rootstocks, which was in agreement with the results of previous studies [1,3,6,16,17,[41][42][43]. Therefore, high levels of proline and CHOs in GH rootstock may explain its higher tolerance to salinity compared with the other rootstocks.…”

Section: Discussionsupporting

confidence: 92%

“…Increasing the NaCl level disrupts the equilibrium of water in plants and reduces the membrane salinity index (MSI) [5]. Most plant species accumulate osmolytes, such as proline, glycine betaine and soluble sugars in their cells to regulate osmotic pressure under salinity stress [6]. Salt stress destroys chlorophyll molecules and inhibits their synthesis [7,8].…”

Section: Introductionmentioning

confidence: 99%

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Osmolyte Accumulation and Sodium Compartmentation Has a Key Role in Salinity Tolerance of Pistachios Rootstocks

et al. 2021

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Physio-biochemical responses of pistachio varieties including Pistacia vera L. ‘Ghazvini’ (GH), P. vera ‘Ghermez-Pesteh’ (GP) and P. atlantica subsp. mutica (M) were assessed under salt stress to understand the common mechanisms of salt tolerance in two popular Pistacia species. In the experiment, half-sib seedlings of the varieties were subjected to high (100 mM) and severe (200 mM) levels of NaCl-induced salinity for 90 days. Growth, physiological, biochemical and ionic parameters in the roots and shoots of plants were measured in the experiment. Salinity markedly declined plant growth, and increased the number of necrotic leaves (NL) and leaf abscission. In terms of physiological responses, salinity reduced the relative water content (RWC), membrane stability index (MSI) and the concentrations of photosynthetic pigments, but increased carbohydrates and proline content in the leaves. MSI of the leaves was positively correlated with the concentrations of anthocyanins and carotenoids. Salinity increased sodium content in root and shoot tissues of the plants, and decreased potassium concentration and K/Na ratio. Among the rootstocks, GH had better performance on all parameters. Despite the high concentration of Na+ and low K/Na ratio in the shoots, the lowest number of NL was found in GH under both salinity levels. The results indicated that salt tolerance in GH was most likely related to compartmentation of Na+ ions. Finally, accumulation of osmolytes and sodium compartmentation were considered to be the most important mechanisms in the salt tolerance of pistachio rootstocks.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Osmolyte Accumulation and Sodium Compartmentation Has a Key Role in Salinity Tolerance of Pistachios Rootstocks

et al. 2021

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“…Drought and salt stresses are common limiting factors of seed germination. Drought and salt stress affects the seed germination process by decreasing water imbibition, including ROS (Reactive Oxygen Species) accumulation, altering enzymatic activities, and causing hormonal imbalances [36][37][38].…”

Section: Introductionmentioning

confidence: 99%

A tubby-like protein CsTLP8 acts in the ABA signaling pathway and negatively regulates osmotic stresses tolerance during seed germination

Wang

et al. 2021

BMC Plant Biol

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Background TLPs (Tubby-like proteins) are widespread in eukaryotes and highly conserved in plants and animals. TLP is involved in many biological processes, such as growth, development, biotic and abiotic stress responses, while the underlying molecular mechanism remains largely unknown. In this paper we characterized the biological function of cucumber (Cucumis sativus L.) Tubby-like protein 8 (CsTLP8) in Arabidopsis. Results In cucumber, the expression of the tubby-like protein CsTLP8 was induced by NaCl treatment, but reduced by PEG (Polyethylene Glycol) and ABA (Abscisic Acid) treatment. Subcellular localization and transcriptional activation activity analysis revealed that CsTLP8 possessed two characteristics of classical transcription factors: nuclear localization and trans-activation activity. Yeast two-hybrid assay revealed interactions of CsTLP8 with CsSKP1a and CsSKP1c, suggesting that CsTLP8 might function as a subunit of E3 ubiquitin ligase. The growth activity of yeast with ectopically expressed CsTLP8 was lower than the control under NaCl and mannitol treatments. Under osmotic and salt stresses, overexpression of CsTLP8 inhibited seed germination and the growth of Arabidopsis seedlings, increased the content of MDA (Malondialdehyde), and decreased the activities of SOD (Superoxide Dismutase), POD (Peroxidase) and CAT (Catalase) in Arabidopsis seedlings. Overexpression of CsTLP8 also increased the sensitivity to ABA during seed germination and ABA-mediated stomatal closure. Conclusion Under osmotic stress, CsTLP8 might inhibit seed germination and seedling growth by affecting antioxidant enzymes activities. CsTLP8 acts as a negative regulator in osmotic stress and its effects may be related to ABA.

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“…Walnut (Juglans regia L.) is a perennial deciduous angiosperm that has received increasing interest during recent years due to its economic importance (Jerszurki et al, 2017;Karimi et al, 2018Karimi et al, , 2020. The growth of walnut is strongly affected by water stress, which induces a declined yield, small kernel size and low quality, and shoot dieback.…”

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Combined effects of water stress and salinity on growth, physiological, and biochemical traits in two walnut genotypes

Wang

Zhang

Pei

et al. 2021

Physiologia Plantarum

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Due to its great economic value, walnut (Juglans regia L.) has received increasing attention during recent years. However, water stress and salinity limit walnut growth, production, and quality. We employed two walnut genotypes, precocious walnut, and late-bearing walnut, to investigate their growth, photosynthetic capacity, nonstructural carbohydrate contents, Cl − allocation, reactive oxygen species (ROS) accumulation, and osmotic regulation under water stress, salinity, and their combination.We found that late-bearing walnut showed higher total biomass and net photosynthetic rate, higher activities of antioxidant enzymes, higher osmoregulation, and lower ROS accumulation than precocious walnut under stressful conditions. In addition, late-bearing walnut restricted salt transport and allocated more Cl − into roots, whereas precocious walnut allocated more Cl − into leaves when exposed to salinity stress. These data collectively demonstrated that late-bearing walnut possesses better stress tolerance under water stress, salinity, and especially under their combination. Such knowledge of genotype-specific responses and tolerances to water stress and salinity is important for walnut plantation management under increasing drought and aggravated soil salinization occurring with climate change. | INTRODUCTIONWater is a crucial limiting resource of plant growth and production, and many areas are expected to experience decreased precipitation under climate change (Choat et al., 2018;Cook et al., 2015). Plants have different physiological and defense responses to lessen the damage under water stress, including changes in morphological and physiological traits to deal with water stress. For example, plants can change biomass allocation between roots and shoots under water-limited conditions

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Inducing drought tolerance in greenhouse grown Juglans regia by imposing controlled salt stress: The role of osmotic adjustment

Cited by 34 publications

References 49 publications

Osmolyte Accumulation and Sodium Compartmentation Has a Key Role in Salinity Tolerance of Pistachios Rootstocks

Osmolyte Accumulation and Sodium Compartmentation Has a Key Role in Salinity Tolerance of Pistachios Rootstocks

A tubby-like protein CsTLP8 acts in the ABA signaling pathway and negatively regulates osmotic stresses tolerance during seed germination

Combined effects of water stress and salinity on growth, physiological, and biochemical traits in two walnut genotypes

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