Sedoheptulose-1,7-Bisphosphatase is Involved in Methyl Jasmonate- and Dark-Induced Leaf Senescence in Tomato Plants

Ding, Fei; Wang, Meiling; Zhang, Shuoxin

doi:10.3390/ijms19113673

Cited by 35 publications

(23 citation statements)

References 58 publications

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“…SBPase is an enzyme involved in carbon fixation [41]. Previous studies have shown that this enzyme is susceptible to chilling temperatures [6,42].…”

Section: Melatonin Increases Photosynthetic Carbon Assimilation and Amentioning

confidence: 99%

Melatonin Mitigates Chilling-Induced Oxidative Stress and Photosynthesis Inhibition in Tomato Plants

2020

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Melatonin has been demonstrated to play a variety of roles in plants. Of particular importance is its role as a potent antioxidative agent. In the present study, we generated melatonin-deficient tomato plants using virus-induced gene silencing (VIGS) approach and melatonin-rich tomato plants by foliar application of melatonin. These tomato plants were used to assess the effect of melatonin on chilling-induced oxidative stress and chilling-induced photosynthesis inhibition. We found that melatonin deficiency increased accumulation of reactive oxygen species (ROS) and aggravated lipid peroxidation in chilling-stressed tomato leaves, while exogenous application of melatonin had the opposite effect. Under chilling stress, melatonin-deficient tomato plants showed impaired antioxidant capacity as evidenced by lower activities of antioxidant enzymes and decreased rations of reduced glutathione (GSH)/oxidized glutathione (GSSG) and reduced ascorbate (AsA)/oxidized ascorbate (DHA), compared with melatonin-rich tomato plants. Furthermore, suppression of melatonin biosynthesis led to more photosynthesis inhibition under the chilling condition and compromised the capability of subsequent photosynthesis recovery in tomato plants. In addition, melatonin-deficient tomato plants displayed less activity of an important Calvin-Benson cycle enzyme sedoheptulose-1,7-bisphosphatase (SBPase) than melatonin-rich tomato plants under chilling stress. Collectively, our data indicate that melatonin is critical for antioxidant capacity and redox balance and is in favor of photosynthesis in tomato plants under chilling stress.

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“…SBPase is an enzyme involved in carbon fixation [41]. Previous studies have shown that this enzyme is susceptible to chilling temperatures [6,42].…”

Section: Melatonin Increases Photosynthetic Carbon Assimilation and Amentioning

confidence: 99%

Melatonin Mitigates Chilling-Induced Oxidative Stress and Photosynthesis Inhibition in Tomato Plants

2020

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“…Chlorophyll was determined by spectrophotometry (Ding et al 2018). For this purpose, 0.5 g leaves without veins were cut into 1 mm 2 pieces and placed in volumetric flasks.…”

Section: Chlorophyll Contentmentioning

confidence: 99%

“…JAs are involved in plant root elongation (Chico et al 2020), water absorption (Luo et al 2019), fertility regulation (Song et al 2018), dormancy breaking (Xu et al 2016), fruit quality improvement (Habibi et al 2020), secondary metabolite synthesis (Donati et al 2019) and stress responses (Overmyer et al 2018, Proietti et al 2018. As early as 1988, studies in barley (Popova et al 1988) demonstrated that exogenous JA had a significant inhibitory effect on photosynthetic and photorespiratory properties, and subsequent research in broccoli (Rahnamaie-Tajadod et al 2017), tomato (Ding et al 2018) and bilberry (Benevenuto et al 2019) supported this notion. However, studies in wheat (Qiu et al 2014) and rapeseed (Ali et al 2018) highlighted that the separated use of JA can promote various photosynthetic responses and chlorophyll accumulation.…”

Section: Introductionmentioning

confidence: 99%

Effects of exogenous methyl jasmonate on the synthesis of endogenous jasmonates and the regulation of photosynthesis in citrus

Qiu

Xiong

et al. 2020

Physiologia Plantarum

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Methyl jasmonate (MeJA) is an airborne signaling phytohormone that can induce changes in endogenous jasmonates (JAs) and cause photosynthetic responses. However, the response of these two aspects of citrus plants at different MeJA concentrations is still unclear. Four MeJA concentrations were used in two citrus varieties, Huangguogan (C. reticulata × C. sinensis) and Shiranuhi [C. reticulata × (C. reticulata × C. sinensis)], to investigate the effects of MeJA dose on the endogenous JAs pathway and photosynthetic capacity. We observed that MeJA acted in a dosedependent manner, and its stimulation in citrus leaves showed a bidirectional character at different concentrations. This work demonstrates that MeJA at only a concentration of 2.2 mM or less contributed to the activation of magnesium protoporphyrin IX methyltransferase (ChlM, EC 2.1.1.11) and protochlorophyllide oxidoreductase (POR, EC 1.3.1.11) and the simultaneous accumulation of Chl a and Chl b, which in turn contributed to an improved photosynthetic capacity and PSII photochemistry efficiency of citrus. Meanwhile, the inhibition of endogenous JAs synthesis by exogenous MeJA was observed. This was achieved by reducing the ratio of monogalactosyl diacylglycerol (MGDG) to diagalactosyl diacylglycerol (DGDG) and inhibiting the activities of key enzymes in JAs synthesis, especially 12-oxo-phytodienoic acid reductase (OPR, EC 1.3.1.42). Another noteworthy finding is that there may exist a JA-independent pathway that could regulate 12-oxo-phytodienoic acid (OPDA) synthesis. This study jointly analyzed the internal hormone regulation mechanism and the external physiological response, as well as revealed the effects of exogenous MeJA on promoting the photosynthesis and inhibiting the endogenous JAs synthesis.

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“…Initiation of leaf senescence is affected by various factors including age, abiotic and biotic stress, and plant hormones (36,37). Effects of plant hormones on senescence such as auxin, cytokinin, gibberellin, ethylene ABA, SA and JA are well-known (29,35,36).…”

Section: Discussionmentioning

confidence: 99%

Karrikinolide Promotes Seed Germination but Has no Effect on Leaf Segment Senescence in Triticum aestivum L.

Sağlam¹,

Duygun²,

Kaya³

et al. 2019

Eur J Biol

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Objective: Germination and senescence are the two most important developmental processes in the plant life cycle. While seed germination is an important physiological event for the continuity of species, leaf senescence is also an important developmental process that impacts crop yields. Karrikins are a group of plant growth regulators found in the smoke generated by burning plant material. It has been suggested that karrikinolide (KAR1) is generally the most active karrikin in terms of stimulating germination. Materials and Methods: In this study, the effect of karrikinolide on germination and leaf segment senescence in wheat was investigated. For this purpose, control, 1 nM, 0.01, 0.1, 1, and 10 μM KAR1 solutions were used. Firstly, the wheat seeds were germinated in the dark in these solutions and germination percentages and root lengths were measured. Secondly, 4 of first leaf segments (3cm. each) from 10-day-old wheat seedlings were placed in petri dishes containing 1, 10, 100 μM KAR1 and distilled water as a control. Following incubation, fresh weight, chlorophyll content, cell death amounts and total protein amounts were determined. Results: The obtained data shows that 1 μM KAR1 promotes germination and root length to the greatest extent. This suggests that karrikins have a promoting effect on the germination of wheat seeds. Our results demonstrate that KAR1 has no effect on leaf segment senescence. Conclusion: Our study suggests that KAR1 has the potential to be used in agriculture to improve germination and seedling growth of crop species.

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Sedoheptulose-1,7-Bisphosphatase is Involved in Methyl Jasmonate- and Dark-Induced Leaf Senescence in Tomato Plants

Cited by 35 publications

References 58 publications

Melatonin Mitigates Chilling-Induced Oxidative Stress and Photosynthesis Inhibition in Tomato Plants

Melatonin Mitigates Chilling-Induced Oxidative Stress and Photosynthesis Inhibition in Tomato Plants

Effects of exogenous methyl jasmonate on the synthesis of endogenous jasmonates and the regulation of photosynthesis in citrus

Karrikinolide Promotes Seed Germination but Has no Effect on Leaf Segment Senescence in Triticum aestivum L.

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