Exogenous melatonin promotes growth and sucrose metabolism of grape seedlings

Zhong, Lisha; Lin, Lijin; Liu, Yang; Wang, Xun; Wang, Jin; Lv, Xiulan; Deng, Honghong; Liang, Dong; Tang, Yi

doi:10.1371/journal.pone.0232033

Cited by 26 publications

(12 citation statements)

References 47 publications

(48 reference statements)

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“…In addition to being involved in defense responses, melatonin is also involved in plant growth in conjunction with photosynthesis when plants were challenged with abiotic stresses [ 20 , 56 ]. For example, melatonin treatment enhanced soybean growth by increasing PSI- and PSII-related genes and increased the rate of photosynthesis in Chinese hickory and grape seedlings upon stresses [ 57 , 58 , 59 ]. Melatonin treatment in tomato seedlings increased PSII activity and the photochemical quenching coefficient against salt stress [ 60 ].…”

Section: Discussionmentioning

confidence: 99%

Melatonin Regulates Chloroplast Protein Quality Control via a Mitogen-Activated Protein Kinase Signaling Pathway

Lee

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2021

Antioxidants

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Serotonin N-acetyltransferase 1 (SNAT1), the penultimate enzyme for melatonin biosynthesis has shown N-acetyltransferase activity toward multiple substrates, including histones, serotonin, and plastid proteins. Under two different light conditions such as 50 or 100 μmol m−2 s−1, a SNAT1-knockout (snat1) mutant of Arabidopsis thaliana ecotype Columbia (Col-0) exhibited small size phenotypes relative over wild-type (WT) Arabidopsis Col-0. Of note, the small phenotype is stronger when growing at the 50 μmol m−2 s−1, exhibiting a dwarfism phenotype and delayed flowering. The snat1 Arabidopsis Col-0 accumulated less starch than the WT Col-0. Moreover, snat1 exhibited lower Lhcb1, Lhcb4, and RBCL protein levels, compared with the WT Col-0, but no changes in the corresponding transcripts, suggesting the involvement of melatonin in chloroplast protein quality control (CPQC). Accordingly, caseinolytic protease (Clp) and chloroplast heat shock proteins (CpHSPs), two key proteins involved in CPQC, as well as ROS defense were suppressed in snat1. In contrast, exogenous melatonin treatment induced expression of Clp, CpHSP, APX1, and GST, but not other growth-related genes such as DWF4, KS, and IAA1. Finally, the induction of ClpR1, APX1, and GST1 in response to melatonin was inhibited in the mitogen-activated protein kinase (MAPK) knockdown Arabidopsis (mpk3/6), suggesting that melatonin-mediated CPQC was mediated, in part, by the MAPK signaling cascade. These results suggest that melatonin is involved in CPQC, which plays a pivotal role in starch synthesis in plants.

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Section: Discussionmentioning

confidence: 99%

Melatonin Regulates Chloroplast Protein Quality Control via a Mitogen-Activated Protein Kinase Signaling Pathway

Lee

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2021

Antioxidants

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“…The authors demonstrated that high doses of melatonin inhibit seedling growth by inducing the excessive accumulation of sucrose, hexose and starch, suppressing photosynthesis and sucrose phloem loading [ 76 ]. The role of melatonin in improving sucrose biosynthesis was also confirmed in pear, grape, and rice plants [ 70 , 79 , 80 ].…”

Section: Regulatory Action Of Melatonin On Carbohydrate Metabolismmentioning

confidence: 97%

Melatonin and Carbohydrate Metabolism in Plant Cells

Arnao

Hernández‐Ruíz

Caño

et al. 2021

Plants

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Melatonin, a multifunctional molecule that is present in all living organisms studied, is synthesized in plant cells in several intercellular organelles including in the chloroplasts and in mitochondria. In plants, melatonin has a relevant role as a modulatory agent which improves their tolerance response to biotic and abiotic stress. The role of melatonin in stress conditions on the primary metabolism of plant carbohydrates is reviewed in the present work. Thus, the modulatory actions of melatonin on the various biosynthetic and degradation pathways involving simple carbohydrates (mono- and disaccharides), polymers (starch), and derivatives (polyalcohols) in plants are evaluated. The possible applications of the use of melatonin in crop improvement and postharvest products are examined.

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“…In this present work, under salt stress or not, seedlings treated with 0.05 mM MT did not show increase or decrease in the plant growth parameters compared with mild salt-stressed plants or well-watered seedlings. In a recent work, Zhong et al (2020) concluded a benefit effect of 0.15 mM MT on grape seedling growth. Seedlings treated with 0.1 mM MT showed better effect on the growth traits of D. odorifera seedlings compared with 0.05 mM MT-treated and well-watered plants.…”

Section: Discussionmentioning

confidence: 99%

“…Several studies showed that exogenous application of MT or GB increases antioxidant enzyme activities under abiotic stress. In grape seedling leaves, exogenous MT treatment can significantly increase the CAT, SOD, and POD activities ( Zhong et al, 2020 ). Exogenous application of GB can increase the activities of SOD, CAT, APX, or POD in wheat leaves against drought and salinity ( Ma et al, 2006 ; Raza et al, 2007 , 2014 ) as well as in Glycine max against salt stress ( Malekzadeh, 2015 ).…”

Section: Discussionmentioning

confidence: 99%

Gly Betaine Surpasses Melatonin to Improve Salt Tolerance in Dalbergia odorifera

et al. 2021

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Salinity is one of the most serious factors limiting plant growth which can provoke significant losses in agricultural crop production, particularly in arid and semi-arid areas. This study aimed to investigate whether melatonin (MT; 0.05 and 0.1 mM), which has pleiotropic roles, has a better effect than glycine betaine (GB; 10 and 50 mM) on providing salt tolerance in a woody plant Dalbergia odorifera T. Chen. Also, the alternative oxidase activity (AOX) in plant subjected to MT or GB under salinity (150 and 250 mM) was evaluated given that the effect of exogenous MT or GB on AOX has not been reported yet. The results showed that the exogenous application of GB on the seedlings of D. odorifera increased the plant growth parameters, relative water content, total of chlorophyll content, and carotenoid content compared with well-watered and MT treatments. Under severe salinity, the seedlings subjected to GB showed, a significant enhancement in water use efficiency, transpiration, and net photosynthetic rate regardless to MT-treated seedlings. The levels of proline and soluble sugar in the seedlings treated with MT or GB decreased significantly under mild and severe salinity correlated with those in salt-stressed seedlings. Furthermore, GB-treated plants exhibited a significant inhibition of malondialdehyde content compared with MT-treated plants. The concentration of thiols and phenolic compounds were significantly enhanced in the leaves of seedlings treated with MT compared with those treated with GB. Under salt stress condition, GB scavenged significantly higher levels of hydrogen peroxide than MT; while under severe salinity, plants subjected to MT showed better scavenging ability for hydroxyl radicals compared with GB-treated seedlings. The results demonstrated also an enhancement of the levels of superoxide dismutase (SOD), guaiacol peroxidase, and AOX activities in seedlings treated with GB or MT compared with salt-stressed plants. The catalase activity (CAT) was increased by 0.05 mM MT and 0.1 mM GB under mild salinity. Meanwhile, the AOX activity under severe salinity was enhanced only by GB 50 mM. The findings of this study suggested that GB-treated seedlings possessed a better salt tolerance in comparison with MT-treated seedlings.

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Exogenous melatonin promotes growth and sucrose metabolism of grape seedlings

Cited by 26 publications

References 47 publications

Melatonin Regulates Chloroplast Protein Quality Control via a Mitogen-Activated Protein Kinase Signaling Pathway

Melatonin Regulates Chloroplast Protein Quality Control via a Mitogen-Activated Protein Kinase Signaling Pathway

Melatonin and Carbohydrate Metabolism in Plant Cells

Gly Betaine Surpasses Melatonin to Improve Salt Tolerance in Dalbergia odorifera

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