Melatonin alleviates salt damage in tomato seedling: A root architecture system, photosynthetic capacity, ion homeostasis, and antioxidant enzymes analysis

Altaf, Muhammad Ahsan; Shahid, Rabia; Ren, Ming‐Xun; Altaf, Muhammad Mohsin; Khan, Latif Ullah; Shahid, Sidra; Jahan, Mohammad Shah

doi:10.1016/j.scienta.2021.110145

Cited by 79 publications

(33 citation statements)

References 37 publications

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“…Zrig et al [68] reported similar results, observing that Thymus vulgaris L. cultivated in a shady enclosure had a higher SOD and CAT than those cultivated in an open field. Opposite trends were observed the in fresh weight and activities of the antioxidant enzymes in tomato seedlings [69] and peanut (Arachis hypogaea L.) seedlings [70], which were consistent with our results. Plants' own reactive oxygen species (ROS) scavenging enzymes, including SOD and CAT, can adapt to diverse stresses.…”

Section: Effects Of Supplementary Light Duration and Light Intensity On Activities Of Antioxidant Enzymes Of Cucumber Seedlingssupporting

confidence: 92%

Morphological and Physiological Properties of Greenhouse-Grown Cucumber Seedlings as Influenced by Supplementary Light-Emitting Diodes with Same Daily Light Integral

Yan

Wang

et al. 2021

Horticulturae

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Insufficient light in autumn–winter may prolong the production periods and reduce the quality of plug seedlings grown in greenhouses. Additionally, there is no optimal protocol for supplementary light strategies when providing the same amount of light for plug seedling production. This study was conducted to determine the influences of combinations of supplementary light intensity and light duration with the same daily light integral (DLI) on the morphological and physiological properties of cucumber seedlings (Cucumis sativus L. cv. Tianjiao No. 5) grown in a greenhouse. A supplementary light with the same DLI of 6.0 mol m−2 d−1 was applied with the light duration set to 6, 8, 10, or 12 h d−1 provided by light-emitting diodes (LEDs), and cucumber seedlings grown with sunlight only were set as the control. The results indicated that increasing DLI using supplementary light promoted the growth and development of cucumber seedlings over those grown without supplementary light; however, opposite trends were observed in the superoxide dismutase (SOD) and catalase (CAT) activities. Under equal DLI, increasing the supplementary light duration from 6 to 10 h d−1 increased the root surface area (66.8%), shoot dry weight (24.0%), seedling quality index (237.0%), root activity (60.0%), and stem firmness (27.2%) of the cucumber seedlings. The specific leaf area of the cucumber seedlings decreased quadratically with an increase in supplementary light duration, and an opposite trend was exhibited for the stem diameter of the cucumber seedlings. In summary, increased DLI or longer light duration combined with lower light intensity with equal DLI provided by supplementary light in insufficient sunlight seasons improved the quality of the cucumber seedlings through the modification of the root architecture and stem firmness, increasing the mechanical strength of the cucumber seedlings for transplanting.

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Section: Effects Of Supplementary Light Duration and Light Intensity On Activities Of Antioxidant Enzymes Of Cucumber Seedlingssupporting

confidence: 92%

Morphological and Physiological Properties of Greenhouse-Grown Cucumber Seedlings as Influenced by Supplementary Light-Emitting Diodes with Same Daily Light Integral

Yan

Wang

et al. 2021

Horticulturae

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“…Recent studies suggest that the growth and biomass production were markedly inhibited by heavy metal stress such as Ni stress in tomato seedlings. In contrast, the growth traits were markedly reinforced by ME application [ 17 , 46 ]. Foliar application of ME remarkably accelerated the vegetative growth of tomato seedlings under DR stress [ 24 ].…”

Section: Discussionmentioning

confidence: 99%

“…Similarly, Altaf et al [ 33 ] revealed that melatonin application dominantly enhanced the root architecture system of tomato seedling under NaCl stress. Moreover, the positive relationship between the ME application and root growth has been well-known in S. lycopersicum [ 17 ], Citrullus lanatus [ 49 ], and Stevia rebaudiana [ 50 ] under abiotic stresses. Interestingly, when the tomato seedlings were exposed to DR-stress, root activity declined remarkably, showing strict association to the nutrients uptake and water withholding.…”

Section: Discussionmentioning

confidence: 99%

“…Hitherto, ME is evidenced to enhance the resistance to different abiotic stresses such as DR, heat, cold, salt, heavy metals, chemicals, and pathogens [ 14 , 15 , 16 ]. Furthermore, ME promoted root morphology seed germination, photosynthesis, seedlings growth, delay in leaf senescence, antioxidant efficiency, fruit maturation and rhizogenesis at cellular and tissue level [ 17 , 18 , 19 ]. Specifically, the increased ROS homeostasis and enhanced antioxidant capacity were related to higher ME content in DR-affected seedlings, such as Actinidia deliciosa [ 20 ], Althaea rosea [ 21 ] Eriobotrya japonica [ 22 ], and Carthamus tinctorius [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

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Melatonin Improves Drought Stress Tolerance of Tomato by Modulating Plant Growth, Root Architecture, Photosynthesis, and Antioxidant Defense System

et al. 2022

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Tomato is an important vegetable that is highly sensitive to drought (DR) stress which impairs the development of tomato seedlings. Recently, melatonin (ME) has emerged as a nontoxic, regulatory biomolecule that regulates plant growth and enhances the DR tolerance mechanism in plants. The present study was conducted to examine the defensive role of ME in photosynthesis, root architecture, and the antioxidant enzymes’ activities of tomato seedlings subjected to DR stress. Our results indicated that DR stress strongly suppressed growth and biomass production, inhibited photosynthesis, negatively affected root morphology, and reduced photosynthetic pigments in tomato seedlings. Per contra, soluble sugars, proline, and ROS (reactive oxygen species) were suggested to be improved in seedlings under DR stress. Conversely, ME (100 µM) pretreatment improved the detrimental-effect of DR by restoring chlorophyll content, root architecture, gas exchange parameters and plant growth attributes compared with DR-group only. Moreover, ME supplementation also mitigated the antioxidant enzymes [APX (ascorbate peroxidase), CAT (catalase), DHAR (dehydroascorbate reductase), GST (glutathione S-transferase), GR (glutathione reductase), MDHAR (monodehydroascorbate reductase), POD (peroxidase), and SOD (superoxide dismutase)], non-enzymatic antioxidant [AsA (ascorbate), DHA (dehydroascorbic acid), GSH (glutathione), and GSSG, (oxidized glutathione)] activities, reduced oxidative damage [EL (electrolyte leakage), H2O2 (hydrogen peroxide), MDA (malondialdehyde), and O2•− (superoxide ion)] and osmoregulation (soluble sugars and proline) of tomato seedlings, by regulating gene expression for SOD, CAT, APX, GR, POD, GST, DHAR, and MDHAR. These findings determine that ME pretreatment could efficiently improve the seedlings growth, root characteristics, leaf photosynthesis and antioxidant machinery under DR stress and thereby increasing the seedlings’ adaptability to DR stress.

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“…To determine the MDA level, H 2 O 2 content, and antioxidant enzyme (CAT, SOD) activity, frozen leaf samples (0.5 g) were crushed using liquid nitrogen. As prescribed in the kit, the ground leaf samples were homogenized in 900 µL of 100 mM phosphate buffer (pH 7.4) [28]. Each homogenized sample was centrifuged at 12,000× g for 15 min at 4 • C, followed by the addition of the supernatant to another falcon tube for further analysis.…”

Section: Photosynthetic Pigmentsmentioning

confidence: 99%

Vanadium Toxicity Induced Changes in Growth, Antioxidant Profiling, and Vanadium Uptake in Pepper (Capsicum annum L.) Seedlings

et al. 2021

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Heavy metal contamination is one of the current serious environmental and agricultural soil issues, and it is mainly due to anthropogenic activities. Vanadium (V) is found in low concentrations in a wide range of plants and is widely distributed in soils. The current study aimed to determine how pepper seedlings responded to various V concentrations, as well as the detrimental effects of V on growth, root morphological traits, photosynthetic performance, reactive oxygen species (ROS), osmolytes production, antioxidant enzyme activities, and V uptake. Pepper seedlings (5 weeks old) were grown in hydroponic culture with six V levels (0, 10, 20, 30, 40, and 50 mg L−1 NH4VO3). After two weeks of V treatment, low level of V (10, 20 mg L−1) enhanced the growth status, conversely higher V (30, 40, and 50 mg L−1) level reduced the growth. The leaf gas exchange elements, pigments molecules, and root growth characteristics are also affected by higher V concentrations. Moreover, V uptake was higher in roots than in the shoot of pepper seedlings. Similarly, osmolytes content, ROS production, and antioxidant enzymes activities were significantly improved under V stress. Concluding, lower V (10, 20 mg L−1) concentration positively affected pepper growth, and higher V (30, 40, and 50 mg L−1) concentration had a detrimental effect on pepper physiological and biochemical mechanisms.

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Melatonin alleviates salt damage in tomato seedling: A root architecture system, photosynthetic capacity, ion homeostasis, and antioxidant enzymes analysis

Cited by 79 publications

References 37 publications

Morphological and Physiological Properties of Greenhouse-Grown Cucumber Seedlings as Influenced by Supplementary Light-Emitting Diodes with Same Daily Light Integral

Morphological and Physiological Properties of Greenhouse-Grown Cucumber Seedlings as Influenced by Supplementary Light-Emitting Diodes with Same Daily Light Integral

Melatonin Improves Drought Stress Tolerance of Tomato by Modulating Plant Growth, Root Architecture, Photosynthesis, and Antioxidant Defense System

Vanadium Toxicity Induced Changes in Growth, Antioxidant Profiling, and Vanadium Uptake in Pepper (Capsicum annum L.) Seedlings

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