Does jasmonic acid regulate photosynthesis, clastogenecity, and phytochelatins in Brassica juncea L. in response to Pb-subcellular distribution?

Agnihotri, Ashish; Seth, Chandra Shekhar

doi:10.1016/j.chemosphere.2019.125361

Cited by 53 publications

(13 citation statements)

References 80 publications

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“…There were changes in activities of the AsA‐GSH cycle‐related enzymes (APX, GR, DHAR and MDHAR) in the Pb‐S plants, similar observations have been reported in Brassica juncea L. (Agnihotri and Seth 2020).…”

Section: Discussionsupporting

confidence: 84%

“…APX and GR are two of the key enzymes related to the AsA‐GSH cycle and ROS‐scavenging (Ozyigit et al 2016). Lead stress enhanced the activity of both enzymes in the pepper plant, as previously observed for GR, although the opposite result was reported for APX activity in Brassica juncea L. (Agnihotri and Seth 2020). In this experiment, the increased accumulation of H 2 O 2 in Pb‐S plants may have been due to an elevation of APX and GR activities.…”

Section: Discussionsupporting

confidence: 61%

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Salicylic acid‐induced hydrogen sulphide improves lead stress tolerance in pepper plants by upraising the ascorbate‐glutathione cycle

Kaya

2020

Physiol Plantarum

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The contribution of hydrogen sulphide (H2S) to salicylic acid (SA) induced lead (Pb) stress tolerance modulated by the ascorbate‐glutathione (AsA‐GSH) cycle was examined in pepper (Capsicum annuum L.) plants. One week after germination, pepper seedlings were sprayed with 0.5 mM SA once a day for a week. Thereafter, seedlings were grown under control (no Pb) or Pb stress (Pb‐S treatment consisting of 0.1 mM PbCl2) for a further 2 weeks. Lead stress reduced plant growth and leaf water status as well as the activities of dehydroascorbate reductase and monodehydroascorbate reductase. However, lead stress elevated leaf Pb, the proline contents, oxidative stress, activities of glutathione reductase and ascorbate peroxidase, as well as the endogenous H2S content. Supplements of SA resulted in improvements in growth parameters, biomass, leaf water status and AsA‐GSH cycle‐related enzyme activities, as well as increasing the H2S content. The positive effect of SA was further enhanced when sodium hydrosulphide was added. However, 0.1 mM hypotaurine (HT) treatment reversed the beneficial effect of SA by reducing the plant H2S content. Application of NaHS in combination with SA + HT suppressed the adverse effect of HT mainly by restoring the plant H2S content, suggesting that higher H2S content, induced by exogenous SA supply, resulted in elevated regulation of the AsA‐GSH cycle.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionsupporting

confidence: 61%

Salicylic acid‐induced hydrogen sulphide improves lead stress tolerance in pepper plants by upraising the ascorbate‐glutathione cycle

Kaya

2020

Physiol Plantarum

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“…However, when the concentration of MeJA reached 4.4 mM, photosynthesis was significantly inhibited, similar to findings in Baphicacanthus cusia (Lin et al 2019) and S cutellaria baicalensis (Quan et al 2018). In addition, several other studies have shown that the photosynthetic rate of plants is dependent on the concentration of exogenous JAs in a non‐linear fashion (Bali et al 2018, Agnihotri and Seth 2020). Therefore, this highlights that the response of different species to different MeJA concentrations is diverse.…”

Section: Discussionmentioning

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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“…Ci is an important parameter used to judge the influence of stomata and stomatal factors on photosynthesis [38]: if A decreases while Gs and Ci decrease, stomatal factors affect photosynthesis; otherwise, the nonstomatal factors are at play. Our results showed that the A of both male and female trees under U stress was lower than that of the trees in the CK group [14,36]. However, Ci was higher in trees under U stress, which indicated P. cathayana under U stress was not CO 2 -limited, confirming that the nonstomatal factor is the main factor reducing A [39].…”

Section: Sex Differences In Gas Exchange and Chlorophyll Fluorescencementioning

confidence: 47%

“…We speculated that the light saturation point of the male trees was higher. The drop in A may have occurred because U affects photosynthesis through the Calvin cycle [36]. After U stress, photosynthesis was blocked, A decreased, Ci increased with an increase in dark respiration, and WUE decreased [37].…”

Section: Sex Differences In Gas Exchange and Chlorophyll Fluorescencementioning

confidence: 99%

Sex-Specific Physiological Responses of Populus cathayana to Uranium Stress

Xia

Cheng

Zheng

et al. 2022

Forests

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Attention is increasingly being paid to the contamination of soil by the radioactive element uranium (U). Phytoremediation of contaminated soil by economically advantageous and environment-protective plants shows considerable potential for addressing this problem. Populus cathayana is a species with high heavy-metal tolerance, economic value, and notable potential for phytoremediation. Plant-sex-related differences can lead to differences in vegetative growth and tolerance to various stressors. As such, in this study, we designed a pot experiment to analyze the responses of male and female trees of P. cathayana to 50 mg kg−1 U stress in contaminated soil for 3 months. We studied the U uptake and distribution, photosynthesis, chlorophyll fluorescence, active oxygen species, and antioxidant enzymes of P. cathayana. The results showed that the photosynthetic activity and chlorophyll fluorescence of male and female trees were similar, and U stress mainly affected the nonstomatal factors and photosystem II during photosynthesis. Regarding the physiological and biochemical processes, male and female trees showed different defense strategies: male trees had higher peroxidase (POD), H2O2, and soluble sugars, but lower malondialdehyde (MDA), superoxide dismutase (SOD), and soluble proteins. Under U stress, the active oxygen produced by male trees could be cleared by antioxidant enzymes, preventing damage to the cell membrane. Male trees accumulated a higher U concentration in their roots than female trees, whereas the transportation of U from roots to leaves in male trees was lower than that in female trees. Therefore, our results suggested that male trees have a higher tolerance capacity and greater ability to remediate U-polluted soil than female trees. Future phytoremediation studies should consider the differences between plant sexes in the tolerance to U-contaminated land.

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Does jasmonic acid regulate photosynthesis, clastogenecity, and phytochelatins in Brassica juncea L. in response to Pb-subcellular distribution?

Cited by 53 publications

References 80 publications

Salicylic acid‐induced hydrogen sulphide improves lead stress tolerance in pepper plants by upraising the ascorbate‐glutathione cycle

Salicylic acid‐induced hydrogen sulphide improves lead stress tolerance in pepper plants by upraising the ascorbate‐glutathione cycle

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

Sex-Specific Physiological Responses of Populus cathayana to Uranium Stress

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