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Reference Detail
| Reference | ||
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| Author | Yu Yang Peng, Li Li Liao, Liu S., Miao Miao Nie, Li J., Lu Dan Zhang, Jian Feng Ma, Zhi Chang Chen | |
| Title | Magnesium Deficiency Triggers SGR-Mediated Chlorophyll Degradation for Magnesium Remobilization. | |
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Abstract: Magnesium (Mg) is a relatively mobile element that is remobilized in plants under Mg-limited conditions through transport from old to young tissues. However, the physiological and molecular mechanisms underlying Mg remobilization in plants remain poorly understood. In this study, we investigated Mg remobilization in rice (<i>Oryza sativa</i>) as facilitated through a Mg dechelatase gene involved in chlorophyll degradation, <i>STAY</i>-<i>GREEN</i> (<i>OsSGR</i>). We first observed that mid-aged leaves of rice are more susceptible to Mg deficiency. Expression of <i>OsSGR</i> was specifically upregulated by Mg deficiency, and the response was more pronounced in mid-aged leaves. Knockout of <i>OsSGR</i> exhibited the stay-green phenotype, which hindered the mobility of Mg from mid-aged leaves to young developing leaves. This decline in Mg mobility was associated with inhibited growth of developing leaves in mutants under Mg-limited conditions. Furthermore, Mg deficiency enhanced reactive oxygen species (ROS) generation in mid-aged leaves. ROS levels, particularly hydrogen peroxide, in turn, positively regulated <i>OsSGR</i> expression, probably through chloroplast-to-nucleus signaling, which triggers chlorophyll degradation to protect mid-aged leaves from photodamage. Taken together, these results show that OsSGR-mediated chlorophyll degradation contributes to not only internal remobilization of Mg from mid-aged leaves to developing leaves, but also photooxidative protection of mid-aged leaves under Mg-limited conditions. ROS appear to act as feedback regulators of <i>OsSGR</i> expression to precisely govern chlorophyll degradation in mid-aged leaves where Mg and photosynthetic capacities are relatively high. |
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| Journal | Plant Physiol. | |
| Country | China | |
| Volume | 181(1) | |
| Pages | 262-275 | |
| Year | 2019 | |
| PubMed ID | 31289214 | |
| PubMed Central ID | 6716262 | |
| DOI | 10.1104/pp.19.00610 | |
| URL | - | |
| Relation | ||
| Gene | SGR SGRL | |
| 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 | - | |
