Abstract
Arsenic (As) is highly toxic to plants and detoxified primarily through complexation with phytochelatins (PCs) and other thiol compounds. To understand the mechanisms of As toxicity and detoxification beyond PCs, we isolated an arsenate-sensitive mutant of Arabidopsis (Arabidopsis thaliana), arsenate induced chlorosis1 (aic1), in the background of the PC synthase-defective mutant cadmium-sensitive1-3 (cad1-3). Under arsenate stress, aic1 cad1-3 showed larger decreases in chlorophyll content and the number and size of chloroplasts than cad1-3 and a severely distorted chloroplast structure. The aic1 single mutant also was more sensitive to arsenate than the wild type (Columbia-0). As concentrations in the roots, shoots, and chloroplasts were similar between aic1 cad1-3 and cad1-3. Using genome resequencing and complementation, TRANSLOCON AT THE OUTER ENVOLOPE MEMBRANE OF CHLOROPLAST132 (TOC132) was identified as the mutant gene, which encodes a translocon protein involved in the import of preproteins from the cytoplasm into the chloroplasts. Proteomic analysis showed that the proteome of aic1 cad1-3 chloroplasts was more affected by arsenate stress than that of cad1-3. A number of proteins related to chloroplast ribosomes, photosynthesis, compound synthesis, and thioredoxin systems were less abundant in aic1 cad1-3 than in cad1-3 under arsenate stress. Our results indicate that chloroplasts are a sensitive target of As toxicity and that AIC1/Toc132 plays an important role in protecting chloroplasts from As toxicity.
| Original language | English |
|---|---|
| Pages (from-to) | 1568-1583 |
| Number of pages | 16 |
| Journal | Plant physiology |
| Volume | 178 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Dec 1 2018 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Physiology
- Genetics
- Plant Science
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Arsenate induced chlorosis 1/ translocon at the outer envolope membrane of chloroplasts 132 protects chloroplasts from arsenic toxicity. / Wang, Peitong; Chen, Xi; Xu, Xuan; Lu, Chenni; Zhang, Wei; Zhao, Fang Jie.
In: Plant physiology, Vol. 178, No. 4, 01.12.2018, p. 1568-1583.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Arsenate induced chlorosis 1/ translocon at the outer envolope membrane of chloroplasts 132 protects chloroplasts from arsenic toxicity
AU - Wang, Peitong
AU - Chen, Xi
AU - Xu, Xuan
AU - Lu, Chenni
AU - Zhang, Wei
AU - Zhao, Fang Jie
PY - 2018/12/1
Y1 - 2018/12/1
N2 - Arsenic (As) is highly toxic to plants and detoxified primarily through complexation with phytochelatins (PCs) and other thiol compounds. To understand the mechanisms of As toxicity and detoxification beyond PCs, we isolated an arsenate-sensitive mutant of Arabidopsis (Arabidopsis thaliana), arsenate induced chlorosis1 (aic1), in the background of the PC synthase-defective mutant cadmium-sensitive1-3 (cad1-3). Under arsenate stress, aic1 cad1-3 showed larger decreases in chlorophyll content and the number and size of chloroplasts than cad1-3 and a severely distorted chloroplast structure. The aic1 single mutant also was more sensitive to arsenate than the wild type (Columbia-0). As concentrations in the roots, shoots, and chloroplasts were similar between aic1 cad1-3 and cad1-3. Using genome resequencing and complementation, TRANSLOCON AT THE OUTER ENVOLOPE MEMBRANE OF CHLOROPLAST132 (TOC132) was identified as the mutant gene, which encodes a translocon protein involved in the import of preproteins from the cytoplasm into the chloroplasts. Proteomic analysis showed that the proteome of aic1 cad1-3 chloroplasts was more affected by arsenate stress than that of cad1-3. A number of proteins related to chloroplast ribosomes, photosynthesis, compound synthesis, and thioredoxin systems were less abundant in aic1 cad1-3 than in cad1-3 under arsenate stress. Our results indicate that chloroplasts are a sensitive target of As toxicity and that AIC1/Toc132 plays an important role in protecting chloroplasts from As toxicity.
AB - Arsenic (As) is highly toxic to plants and detoxified primarily through complexation with phytochelatins (PCs) and other thiol compounds. To understand the mechanisms of As toxicity and detoxification beyond PCs, we isolated an arsenate-sensitive mutant of Arabidopsis (Arabidopsis thaliana), arsenate induced chlorosis1 (aic1), in the background of the PC synthase-defective mutant cadmium-sensitive1-3 (cad1-3). Under arsenate stress, aic1 cad1-3 showed larger decreases in chlorophyll content and the number and size of chloroplasts than cad1-3 and a severely distorted chloroplast structure. The aic1 single mutant also was more sensitive to arsenate than the wild type (Columbia-0). As concentrations in the roots, shoots, and chloroplasts were similar between aic1 cad1-3 and cad1-3. Using genome resequencing and complementation, TRANSLOCON AT THE OUTER ENVOLOPE MEMBRANE OF CHLOROPLAST132 (TOC132) was identified as the mutant gene, which encodes a translocon protein involved in the import of preproteins from the cytoplasm into the chloroplasts. Proteomic analysis showed that the proteome of aic1 cad1-3 chloroplasts was more affected by arsenate stress than that of cad1-3. A number of proteins related to chloroplast ribosomes, photosynthesis, compound synthesis, and thioredoxin systems were less abundant in aic1 cad1-3 than in cad1-3 under arsenate stress. Our results indicate that chloroplasts are a sensitive target of As toxicity and that AIC1/Toc132 plays an important role in protecting chloroplasts from As toxicity.
UR - http://www.scopus.com/inward/record.url?scp=85058469577&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85058469577&partnerID=8YFLogxK
U2 - 10.1104/pp.18.01042
DO - 10.1104/pp.18.01042
M3 - Article
C2 - 30309965
AN - SCOPUS:85058469577
VL - 178
SP - 1568
EP - 1583
JO - Plant Physiology
JF - Plant Physiology
SN - 0032-0889
IS - 4
ER -