Effects of reduced chlorophyll content on photosystem functions and photosynthetic electron transport rate in rice leaves

Wang, Guojiao; Zeng, Faliang; Song, Peng; Sun, Bei; Wang, Qi; Wang, Jiayu

doi:10.1016/j.jplph.2022.153669

Cited by 60 publications

(43 citation statements)

References 47 publications

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Section: Discussionmentioning

confidence: 99%

“…Plants with higher chlorophyll content have larger antenna size and can capture and absorb more light energy [65]. On the contrary, plants with reduced chlorophyll content have smaller chlorophyll antenna size, representing reduced NPQ and ROS generation [65]. Decreasing leaf chlorophyll concentration has been suggested as a potential method to reduce excess absorption of sunlight and improve photosynthetic efficiency [1,2,[65][66][67].…”

Section: Discussionmentioning

confidence: 99%

“…On the contrary, plants with reduced chlorophyll content have smaller chlorophyll antenna size, representing reduced NPQ and ROS generation [65]. Decreasing leaf chlorophyll concentration has been suggested as a potential method to reduce excess absorption of sunlight and improve photosynthetic efficiency [1,2,[65][66][67]. Improved photosynthetic efficiency is achieved via a better allocation of absorbed light energy that also reduces photooxidative stress [68].…”

Section: Discussionmentioning

confidence: 99%

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Harnessing the Role of Foliar Applied Salicylic Acid in Decreasing Chlorophyll Content to Reassess Photosystem II Photoprotection in Crop Plants

Moustakas

Sperdouli

Adamakis

et al. 2022

IJMS

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Salicylic acid (SA), an essential plant hormone, has received much attention due to its role in modulating the adverse effects of biotic and abiotic stresses, acting as an antioxidant and plant growth regulator. However, its role in photosynthesis under non stress conditions is controversial. By chlorophyll fluorescence imaging analysis, we evaluated the consequences of foliar applied 1 mM SA on photosystem II (PSII) efficiency of tomato (Solanum lycopersicum L.) plants and estimated the reactive oxygen species (ROS) generation. Tomato leaves sprayed with 1 mM SA displayed lower chlorophyll content, but the absorbed light energy was preferentially converted into photochemical energy rather than dissipated as thermal energy by non-photochemical quenching (NPQ), indicating photoprotective effects provided by the foliar applied SA. This decreased NPQ, after 72 h treatment by 1 mM SA, resulted in an increased electron transport rate (ETR). The molecular mechanism by which the absorbed light energy was more efficiently directed to photochemistry in the SA treated leaves was the increased fraction of the open PSII reaction centers (qp), and the increased efficiency of open reaction centers (Fv’/Fm’). SA induced a decrease in chlorophyll content, resulting in a decrease in non-regulated energy dissipated in PSII (ΦNO) under high light (HL) treatment, suggesting a lower amount of triplet excited state chlorophyll (3Chl*) molecules available to produce singlet oxygen (1O2). Yet, the increased efficiency, compared to the control, of the oxygen evolving complex (OEC) on the donor side of PSII, associated with lower formation of hydrogen peroxide (H2O2), also contributed to less creation of ROS. We conclude that under non stress conditions, foliar applied SA decreased chlorophyll content and suppressed phototoxicity, offering PSII photoprotection; thus, it can be regarded as a mechanism that reduces photoinhibition and photodamage, improving PSII efficiency in crop plants.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Harnessing the Role of Foliar Applied Salicylic Acid in Decreasing Chlorophyll Content to Reassess Photosystem II Photoprotection in Crop Plants

Moustakas

Sperdouli

Adamakis

et al. 2022

IJMS

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“…The main pigments for absorbing the light quanta and transferring the energy to the reaction centers for the charge separation and the consequential electron transport are the chlorophyll molecules [ 95 , 96 , 97 ]. Mutants that have reduced chlorophyll content retain smaller light-harvesting chlorophyll antenna and a more efficient light partitioning; thus, they can be used to improve photosynthetic efficiency [ 98 ]. Improved photosynthetic efficiency is achieved via a better allocation of absorbed light energy that also reduces photo-oxidative stress [ 99 ].…”

Section: Discussionmentioning

confidence: 99%

“…The Zn-treated plants with a lower chlorophyll content compared to the controls are characterized by a reduced probability of 3 Chl* formation, and this translates to a reduced probability to produce 1 O 2 [ 103 ], as it was documented by the observed lower Φ NO ( Figure 3 d), thus pointing to reduced ROSs [ 104 ]. Thus, our results suggest that the light absorbed by Zn-treated plants with reduced chlorophyll content was more efficiently partitioned to photosynthesis [ 98 ], and excess Zn can be used to improve photosynthetic efficiency. The decreased chlorophyll content in Zn-treated clary sage plants can be regarded as a mechanism that can lower the photoinhibition and photodamage of PSII [ 91 , 92 ].…”

Section: Discussionmentioning

confidence: 99%

A Hormetic Spatiotemporal Photosystem II Response Mechanism of Salvia to Excess Zinc Exposure

Moustakas

Dobrikova

Sperdouli

et al. 2022

IJMS

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Exposure of Salvia sclarea plants to excess Zn for 8 days resulted in increased Ca, Fe, Mn, and Zn concentrations, but decreased Mg, in the aboveground tissues. The significant increase in the aboveground tissues of Mn, which is vital in the oxygen-evolving complex (OEC) of photosystem II (PSII), contributed to the higher efficiency of the OEC, and together with the increased Fe, which has a fundamental role as a component of the enzymes involved in the electron transport process, resulted in an increased electron transport rate (ETR). The decreased Mg content in the aboveground tissues contributed to decreased chlorophyll content that reduced excess absorption of sunlight and operated to improve PSII photochemistry (ΦPSII), decreasing excess energy at PSII and lowering the degree of photoinhibition, as judged from the increased maximum efficiency of PSII photochemistry (Fv/Fm). The molecular mechanism by which Zn-treated leaves displayed an improved PSII photochemistry was the increased fraction of open PSII reaction centers (qp) and, mainly, the increased efficiency of the reaction centers (Fv′/Fm′) that enhanced ETR. Elemental bioimaging of Zn and Ca by laser ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS) revealed their co-localization in the mid-leaf veins. The high Zn concentration was located in the mid-leaf-vein area, while mesophyll cells accumulated small amounts of Zn, thus resembling a spatiotemporal heterogenous response and suggesting an adaptive strategy. These findings contribute to our understanding of how exposure to excess Zn triggered a hormetic response of PSII photochemistry. Exposure of aromatic and medicinal plants to excess Zn in hydroponics can be regarded as an economical approach to ameliorate the deficiency of Fe and Zn, which are essential micronutrients for human health.

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Salt‐tolerant plant growth‐promoting Pseudomonas atacamensis KSS‐6 in combination with organic manure enhances rice yield, improves nutrient content and soil properties under salinity stress

Arora,

Mishra,

Singh

et al. 2024

J Basic Microbiol

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In the current study salt tolerant‐plant growth‐promoting rhizobacteria (ST‐PGPR) Pseudomonas atacamensis KSS‐6, selected on the basis of prominent plant growth‐promoting (PGP) and stress tolerance properties was tested as bioinoculant to improve yield of rice grown in saline soil. The ST‐PGPR KSS‐6 was capable of maintaining the PGP traits up to 200 mM NaCl, however, higher salt stress conditions affected these activities. The study was designed to determine the effect of developed talc‐based bioformulation using KSS‐6 along with organic manure (OM) on growth and yield of paddy under saline conditions. Bioformulation broadcasting was also done to examine the effect on soil properties. It was found that the combinatorial treatment showed positive impact on growth and yield of rice under saline conditions. Co‐application of KSS‐6 with OM showed maximum increment in growth, chlorophyll content, plant fresh weight, and dry weight as compared to untreated control plants. Furthermore, the combinatorial treatment improved the nutrient content (P, K, Zn, Fe, Mg, and Mn) by more than 35% and enhanced the biochemical parameters such as proline, flavonoids, carbohydrates, protein, dietary fiber, and antioxidant content of rice grains by more than 32%. Soil parameters including pH and electrical conductivity (EC), moisture content, total organic carbon, OM, sodium, and chloride ions were also improved upon treatment. There was significant lowering of EC from 7.43 to 4.3 dS/m when combination of OM and bacteria were applied. These findings suggest that the application of KSS‐6 in the form of bioinoculant could be a promising strategy to mitigate negative impacts of salt stress and enhance the yield and nutritional properties of rice grown in degraded and saline soil.

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Effects of reduced chlorophyll content on photosystem functions and photosynthetic electron transport rate in rice leaves

Cited by 60 publications

References 47 publications

Harnessing the Role of Foliar Applied Salicylic Acid in Decreasing Chlorophyll Content to Reassess Photosystem II Photoprotection in Crop Plants

Harnessing the Role of Foliar Applied Salicylic Acid in Decreasing Chlorophyll Content to Reassess Photosystem II Photoprotection in Crop Plants

A Hormetic Spatiotemporal Photosystem II Response Mechanism of Salvia to Excess Zinc Exposure

Salt‐tolerant plant growth‐promoting Pseudomonas atacamensis KSS‐6 in combination with organic manure enhances rice yield, improves nutrient content and soil properties under salinity stress

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