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Reference Detail
| Reference | ||
|---|---|---|
| Author | Xu Z. | |
| Title | A Specific Protective Mechanism Against Chloroplast Photo-Reactive Oxygen Species in Phosphate-Starved Rice Plants. | |
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Abstract: Phosphorus (Pi) starvation prevents a good match between light energy absorption and photosynthetic carbon metabolism, generating photo-reactive oxygen species (photo-ROS) in chloroplasts. Plants have evolved to withstand photo-oxidative stress, but the key regulatory mechanism underlying it remains unclear. In rice (Oryza sativa), DEEP GREEN PANICLE1 (DGP1) is robustly up-regulated in response to Pi deficiency. DGP1 decreases the DNA-binding capacities of the transcriptional activators GLK1/2 on the photosynthetic genes involved in chlorophyll biosynthesis, light harvesting, and electron transport. This Pi-starvation-induced mechanism dampens both electron transport rates through photosystem I and II (ETRI and ETRII) and thus mitigates the electron-excessive stress in mesophyll cells. Meanwhile, DGP1 hijacks glycolytic enzymes GAPC1/2/3, redirecting glucose metabolism toward the pentose phosphate pathway with superfluous NADPH production. Phenotypically, light irradiation induces O2 - production in Pi-starved WT leaves but is observably accelerated in DGP1 mutant and impaired in GAPCsRNAi and glk1glk2 lines. Interestingly, overexpressed DGP1 in rice caused hyposensitivity to ROS-inducers (catechin and methyl viologen), but the DGP1 mutant shows a similar inhibitory phenotype with the WT seedlings. Overall, the DGP1 gene serves as a specific antagonizer against photo-ROS in Pi-starved rice plants, which coordinates light-absorbing and anti-oxidative systems by orchestrating transcriptional and metabolic regulations, respectively. |
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| Journal | Adv Biol (Weinh) | |
| Country | China | |
| Volume | ||
| Pages | e2300106 | |
| Year | 2023 | |
| PubMed ID | 37409401 | |
| PubMed Central ID | - | |
| DOI | 10.1002/adbi.202300106 | |
| URL | - | |
| Relation | ||
| Gene | DGP1 DGP1B DGP1C GAPC GAPC1 GAPC2 GLK1 GLK2 PSAE PSAG PSBR3 PSBW | |
| INSD | - | |
| Strain | Wild Core Collection | - |
| Induced Mutation Lines(NIG Collection) | - | |
| Sterile Seed Strain | - | |
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Lethal Embryo Mutantion Strain |
- | |
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Stages in Each Organ - Muant Lines (Gene) |
- | |
| Cultivated Varieties(NIG Collection) | - | |
| Stages in Each Organ | - | |
