Upregulation of the mitochondrial alternative oxidase pathway improves PSII function and photosynthetic electron transport in tomato seedlings under chilling stress

ZENG, J.J.; Hu, Wen Hai; Hu, Xinjiang; Tao, Huifang; ZHONG, L.; LIU, L.L.

doi:10.32615/ps.2022.019

Cited by 7 publications

(2 citation statements)

References 55 publications

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“…From the L-band and K-band, we can understand the group of the PSII subunits or energetic connectivity between the antenna and RCs of PSII and the situation of OEC centers at the PSII donor side ( Strasser et al., 2004 ; Kalaji et al., 2018 ). Studies showed that the K-band usually occurred in plants that suffer from chilling, heat or drought stress ( Strasser et al., 2004 ; Chen et al., 2016 ; Silva Dalberto et al., 2017 ; Dimitrova et al., 2020 ; Zeng et al., 2022 ). This phenomenon might be indirectly caused by the block of PSII electron flow beyond Q A , resulting in a large accumulation of reactive oxygen species (ROS) in PSII ( Rutherford and Krieger-Liszkay, 2001 ; Guo et al., 2020 ).…”

Section: Discussionmentioning

confidence: 99%

Insights into melatonin-induced photosynthetic electron transport under low-temperature stress in cucumber

Ahammed

et al. 2022

Front. Plant Sci.

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In this study, the differences in chlorophyll fluorescence transient (OJIP) and modulated 820 nm reflection (MR820) of cucumber leaves were probed to demonstrate an insight into the precise influence of melatonin (MT) on cucumber photosystems under low temperature stress. We pre-treated cucumber seedlings with different levels of MT (0, 25, 50, 100, 200, and 400 μmol · L-1) before imposing low temperature stress (10 °C/6 °C). The results indicated that moderate concentrations of MT had a positive effect on the growth of low temperature-stressed cucumber seedlings. Under low temperature stress conditions, 100 μmol · L-1 (MT 100) improved the performance of the active photosystem II (PSII) reaction centers (PIabs), the oxygen evolving complex activity (OEC centers) and electron transport between PSII and PSI, mainly by decreasing the L-band, K-band, and G-band, but showed differences with different duration of low temperature stress. In addition, these indicators related to quantum yield and energy flux of PSII regulated by MT indicated that MT (MT 100) effectively protected the electron transport and energy distribution in the photosystem. According to the results of WO-I ≥ 1 and MR820 signals, MT also affected PSI activity. MT 100 decreased the minimal value of MR/MRO and the oxidation rate of plastocyanin (PC) and PSI reaction center (P700) (Vox), while increased △MRslow/MRO and deoxidation rates of PC+ and P700+ (Vred). The loss of the slow phase of MT 200 and MT 400-treated plants in the MR820 kinetics was due to the complete prevention of electron movement from PSII to re-reduce the PC+ and P700 +. These results suggest that appropriate MT concentration (100 μmol · L-1) can improve the photosynthetic performance of PS II and electron transport from primary quinone electron acceptor (QA) to secondary quinone electron acceptor (QB), promote the balance of energy distribution, strengthen the connectivity of PSI and PSII, improve the electron flow of PSII via QA to PC+ and P700+ from reaching PSI by regulating multiple sites of electron transport chain in photosynthesis, and increase the pool size and reduction rates of PSI in low temperature-stressed cucumber plants, All these modifications by MT 100 treatment promoted the photosynthetic electron transfer smoothly, and further restored the cucumber plant growth under low temperature stress. Therefore, we conclude that spraying MT at an appropriate concentration is beneficial for protecting the photosynthetic electron transport chain, while spraying high concentrations of MT has a negative effect on regulating the low temperature tolerance in cucumber.

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Section: Discussionmentioning

confidence: 99%

Insights into melatonin-induced photosynthetic electron transport under low-temperature stress in cucumber

Ahammed

et al. 2022

Front. Plant Sci.

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“…It has been well established that PSII is a thermolabile component of thylakoid membranes, susceptible to heat stress (Havaux and Tardy, 1996; Hu et al, 2020; Wang et al, 2022). Heat stress impedes not only the oxygen‐evolving complex of PSII (Enami et al, 1994) but also adversely affects Fv/Fm , ATP synthesis, and electron transport of PSII (Ahammed et al, 2018; Zeng et al, 2022; Lü et al, 2023; Havaux, 1993). Our findings indicate that the heat stress diminished the Pn , Fv/Fm , ETR, and quantum yields of PSII in all genotypes examined.…”

Section: Discussionmentioning

confidence: 99%

Plastid‐expressed AdDjSKI enhances photosystem II stability, delays leaf senescence, and increases fruit yield in tomato plants under heat stress

Bulle,

Devadasu,

Rampuria

et al. 2024

Physiologia Plantarum

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Heat stress substantially reduces tomato (Solanum lycopersicum) growth and yield globally, thereby jeopardizing food security. DnaJ proteins, constituents of the heat shock protein system, protect cells from diverse environmental stresses as HSP‐70 molecular co‐chaperones. In this study, we demonstrated that AdDjSKI, a serine‐rich DnaJ III protein induced by pathogens, plays an important role in stabilizing photosystem II (PSII) in response to heat stress. Our results revealed that transplastomic tomato plants expressing the AdDjSKI gene exhibited increased levels of total soluble proteins, improved growth and chlorophyll content, reduced malondialdehyde (MDA) accumulation, and diminished PSII photoinhibition under elevated temperatures when compared with wild‐type (WT) plants. Intriguingly, these transplastomic plants maintained higher levels of D1 protein under elevated temperatures compared with the WT plants, suggesting that overexpression of AdDjSKI in plastids is crucial for PSII protection, likely due to its chaperone activity. Furthermore, the transplastomic plants displayed lower accumulation of superoxide radical (O2•─) and H2O2, in comparison with the WT plants, plausibly attributed to higher superoxide dismutase (SOD) and ascorbate peroxidase (APX) activities. This also coincides with an enhanced expression of corresponding genes, including SlCuZnSOD, SlFeSOD, SlAPX2, and SltAPX, under heat stress. Taken together, our findings reveal that chloroplastic expression of AdDjSKI in tomatoes plays a critical role in fruit yield, primarily through a combination of delayed senescence and stabilizing PSII under heat stress.

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Antioxidant Potential and Osmotic Adjustment Modulate Growth and Yield Formation in Kabuli-Type Chickpea Genotypes Under Freezing Stress

Hasanfard

Nabati

Nezami

et al. 2023

J Plant Growth Regul

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Upregulation of the mitochondrial alternative oxidase pathway improves PSII function and photosynthetic electron transport in tomato seedlings under chilling stress

Cited by 7 publications

References 55 publications

Insights into melatonin-induced photosynthetic electron transport under low-temperature stress in cucumber

Insights into melatonin-induced photosynthetic electron transport under low-temperature stress in cucumber

Plastid‐expressed AdDjSKI enhances photosystem II stability, delays leaf senescence, and increases fruit yield in tomato plants under heat stress

Antioxidant Potential and Osmotic Adjustment Modulate Growth and Yield Formation in Kabuli-Type Chickpea Genotypes Under Freezing Stress

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