Exogenous 5‐aminolevulinic acid improves strawberry tolerance to osmotic stress and its possible mechanisms

Cai, Changyu; He, Shasha; An, Yuyan; Wang, Liangju

doi:10.1111/ppl.13038

Cited by 41 publications

(51 citation statements)

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“…In the present study, after 7 days of treatment, leaves of drought‐treated plants were wilted and the shoot biomass decreased along with the leaf gas exchange attributes (Pn, Tr, Gs, and Ci) and RWC, suggesting that drought stress causes cell dehydration and plant growth reduction. These findings correspond to previous studies in different crop plants under water stress (Cai et al, 2020; Liang et al, 2020; Terletskaya et al, 2020). Drought stress treatment significantly tempered the leaf gas exchange parameters (Pn, Gs, and Tr), while considerable reductions in Pn and Gs were observed in the sensitive cultivar (GY605) upon drought stress compared to control (Table 1), which correspond to previous studies on drought stress (Demirel et al, 2020).…”

Section: Discussionsupporting

confidence: 93%

Drought tolerance inBrassica napusis accompanied with enhanced antioxidative protection, photosynthetic and hormonal regulation at seedling stage

Ayyaz

Miao

Hannan

et al. 2021

Physiologia Plantarum

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Climate change, food insecurity, water scarcity, and population growth are some of today's world's frightening problems. Drought stress exerts a constant threat to field crops and is often seen as a major constraint on global agricultural productivity; its intensity and frequency are expected to increase in the near future. The present study investigated the effects of drought stress (15% w/v polyethylene glycol PEG-6000) on physiological and biochemical changes in five Brassica napus cultivars (ZD630, ZD622, ZD619, GY605, and ZS11). For drought stress induction, 3-weekold rapeseed oil seedlings were treated with PEG-6000 in full strength Hoagland nutrient solution for 7 days. PEG treatment significantly decreased the plant growth and photosynthetic efficiency, including primary photochemistry (Fv/Fm) of PSII, intercellular CO 2 , net photosynthesis, chlorophyll contents, and water-use efficiency of all studied B. napus cultivars; however, pronounced growth retardations were observed in cultivar GY605. Drought-stressed B. napus cultivars also experienced a sharp rise in H 2 O 2 generation and malondialdehyde (MDA) content. Additionally, the accumulation of ROS was accompanied by increased activity of enzymatic antioxidants (superoxide dismutase, peroxidase, catalase, ascorbate peroxidase, glutathione reductase, and monodehydroascorbate reductase), although the increase was more obvious in ZD622 and ZS11. Drought stress also caused an increased endogenous hormonal biosynthesis (abscisic acid, jasmonic acid, salicylic acid) and accumulation of total soluble proteins and proline content, but the extent varies in B. napus cultivars.These results suggest that B. napus cultivars have an efficient drought stress tolerance mechanism, as shown by improved antioxidant enzyme activities, photosynthetic and hormonal regulation. | INTRODUCTIONWater stress is an increasingly scarce resource that decreases crop production in many parts of the world. Drought stress is one of the most severe abiotic environmental stress factors affecting crop production worldwide (Kour et al., 2020). Rapid anthropogenic climatic changes affect the annual precipitation pattern, leading to severe drought stress in many agricultural areas (Scott et al., 2014). Acquiring drought tolerance in plants probably involves molecular, cellular, physiological, and developmental adjustments enabling plants to adopt an adequate response to maintain optimal growth and development (Bergmann, 2020). In plants, drought stress adaptive strategies have been categorized as (1) drought tolerance via early flowering (Khadka et al., 2020), (2) drought escape via enhanced water uptake and reduced

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Section: Discussionsupporting

confidence: 93%

Drought tolerance inBrassica napusis accompanied with enhanced antioxidative protection, photosynthetic and hormonal regulation at seedling stage

Ayyaz

Miao

Hannan

et al. 2021

Physiologia Plantarum

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“…Never attention had been payed to different responses of H 2 O 2 between shoots and roots [7] until Wu et al, who found that salt stress induced H 2 O 2 increase in both leaves and roots, and ALA induced more H 2 O 2 increase in roots but depressed in leaves [25]. The tissue-speci c response is con rmed recently [53] and observed in present work once again (Fig. 4), which may be an important characteristic for ALA to induce plant stress tolerance.…”

Section: Discussionmentioning

confidence: 97%

5-Aminolevulinic Acid-induced Salt Tolerance in Strawberry: Possible Role of Nitric Oxide on Interception of Salty Ions in Roots

He¹,

An²,

Yang³

et al. 2020

Preprint

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Background: 5-Aminolevunic acid (ALA), as a natural non-protein amino acid and the first essential precursor of tetrapyrrole biosynthesis in all living bodies, has been suggested to improve salt tolerance of plants. In the previous work, we reported that ALA induces H2O2 accumulation in roots of strawberry, which is involved in up-regulating Na+ transporter gene expressions to intercept Na+ in roots with less upward transport. However, the signal route is not clear.Results: In this study, we propose that nitric oxide (NO) is involved in ALA signaling cascade. Therefore, we applied sodium nitrosylpentacy (SNP, NO donor), Na2WO4 (NO biosynthetic inhibitor), and 2, 4-carboxyphenyl-4, 4, 5, 5-tetramethylimidazoline-1-oxyl-3-oxide (cPTIO, NO scavenger) to the culture solution when strawberry (Fragaria × ananassa Duch. cv. ‘Benihoppe’) was stressed by 100 mmol L-1 NaCl with or without exogenous ALA. The results reveal that salinity greatly impaired plant growth while 10 mg L-1 ALA or 10 µM SNP ameliorated the inhibition. When 5 µM Na2WO4 or cPTIO was co-treated, the ALA-improved salt tolerance was almost completely eliminated. This suggests that ALA-improved salt tolerance is dependent on NO presence. We found that salinity caused NO, H2O2, Na+ and Cl- increases in the whole plants, while ALA induced additional increases in roots but significant depressions in leaves. These tissue-specific responses to ALA are important for plant salt tolerance. Conclusion: We propose that the regulation of ALA in roots is critical, which is mediated through NO and then H2O2 signal to up-express genes related with Na+ and Cl- transport, selectively retaining Na+ and Cl- in roots with less upward transport. The hypothesis can reasonably explain how ALA-treated plants cope with toxic ions under salinity.

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“…In cucumber seedlings, significantly enhanced activities of SOD, POD, CAT, APX (Ascorbate peroxidase), and GR (Glutathione reductase), and reduced ROS and MDA accumulation, are observed under ALA treatment combined with low-temperature stress [10]. Previous studies have reported that ALA activates the plant defense system and defense-related genes, such as genes encoding SOD, POD, CAT, and APX, in rice and strawberry under osmotic and photodynamic stresses and reduce overproduction of ROS and MDA [31][32][33]. ALA is a precursor of heme biosynthesis, and CAT, POD, and APX contain a heme prosthetic group [14], which might be the reason that antioxidant enzyme activities were stimulated in ALA-treated seedlings ( Figure 5).…”

Section: Discussionmentioning

confidence: 99%

Substrate Application of 5-Aminolevulinic Acid Enhanced Low-temperature and Weak-light Stress Tolerance in Cucumber (Cucumis sativus L.)

Anwar

Wang

et al. 2020

Agronomy

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5-Aminolevulinic acid (ALA) is a type of nonprotein amino acid that promotes plant stress tolerance. However, the underlying physiological and biochemical mechanisms are not fully understood. We investigated the role of ALA in low-temperature and weak-light stress tolerance in cucumber seedlings. Seedlings grown in different ALA treatments (0, 10, 20, or 30 mg ALA·kg−1 added to substrate) were exposed to low temperature (16/8 ˚C light/dark) and weak light (180 μmol·m−2·s−1 photosynthetically active radiation) for two weeks. Treatment with ALA significantly alleviated the inhibition of plant growth, and enhanced leaf area, and fresh and dry weight of the seedlings under low-temperature and weak-light stress. Moreover, ALA increased chlorophyll (Chl) a, Chl b, and Chl a+b contents. Net photosynthesis rate, stomatal conductance, transpiration rate, photochemical quenching, non-photochemical quenching, actual photochemical efficiency of photosystem II, and electron transport rate were significantly increased in ALA-treated seedlings. In addition, ALA increased root activity and antioxidant enzyme (superoxide dismutase, peroxidase, and catalase) activities, and reduced reactive oxygen species (hydrogen peroxide and superoxide radical) and malondialdehyde accumulation in the root and leaf of cucumber seedlings. These findings suggested that ALA incorporation in the substrate alleviated the adverse effects of low-temperature and weak-light stress, and improved Chl contents, photosynthetic capacity, and antioxidant enzyme activities, and thus enhanced cucumber seedling growth.

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Exogenous 5‐aminolevulinic acid improves strawberry tolerance to osmotic stress and its possible mechanisms

Cited by 41 publications

References 41 publications

Drought tolerance inBrassica napusis accompanied with enhanced antioxidative protection, photosynthetic and hormonal regulation at seedling stage

Drought tolerance inBrassica napusis accompanied with enhanced antioxidative protection, photosynthetic and hormonal regulation at seedling stage

5-Aminolevulinic Acid-induced Salt Tolerance in Strawberry: Possible Role of Nitric Oxide on Interception of Salty Ions in Roots

Substrate Application of 5-Aminolevulinic Acid Enhanced Low-temperature and Weak-light Stress Tolerance in Cucumber (Cucumis sativus L.)

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