Abstract
Soil heavy metal (HM) contamination has posed a serious problem for safe food production. For restricting the translocation of HM into grain, many proteins were regulated to involve in the process. To identify these proteins, 2D-based proteomic analysis was carried out using different rice genotypes with distinct Cd accumulation in grains and as affected by an alleviating regulator (AR) in field experiments. AR application improved grain quality, with increased contents in Glu, Cys, His, Pro, and protein. Twenty-six low-grain HM accumulation-associated protein species were identified and categorized as physiological functions via two-dimensional gel electrophoresis (2DE) and mass spectrometry. Among these proteins, 8, 9, and 9 proteins exhibited higher accumulation, lower accumulation, and unchanged accumulation, respectively, in Xiushui817 (low accumulator) vs R8097 (high accumulator) under control conditions but showed differential accumulation patterns after AR application. These proteins included sucrose synthase 3, alanine aminotransferase, glutelin, cupin family protein, and zinc finger CCCH domain-containing protein 32. The differential expression of these protein species might contribute to decreased HM accumulation in grain via decreasing the protein accumulation which had high affinity to HM or regulating energy metabolism and signal transduction. Our findings provide valuable insights into the mechanisms of low-grain HM accumulation in rice and possible utilization of candidate protein species in developing low-grain HM accumulation genotypes.
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Abbreviations
- AAT:
-
Alanine aminotransferase
- Ala:
-
Alanine
- AR:
-
Alleviating regulator
- Arg:
-
Arginine
- Asp:
-
Aspartic acid
- CAM:
-
Calmodulin
- CCSPK:
-
Calcium and calcium/calmodulin-dependent serine/threonine protein kinase
- Cd:
-
Cadmium
- Cys:
-
Cysteine
- DW:
-
Dry weight
- ELBP:
-
Endosperm lumenal binding protein
- His:
-
Histidine
- Ile:
-
Isoleucine
- GSH:
-
Glutathione
- Glu:
-
Glutamic acid
- GLP:
-
Germin-like protein 3
- Gly:
-
Glycine
- GPAT:
-
Glucose-1-phosphate adenylyltransferase small subunit
- HM:
-
Heavy metal
- LEA:
-
Late embryogenesis abundant protein 1
- Leu:
-
Leucine
- Met:
-
Methionine
- Lys:
-
Lysine
- MPC:
-
Maximum permissible concentration
- NIRS:
-
Near-infrared reflectance spectroscopy
- Phe:
-
Phenylalanine
- PGK:
-
Phosphoglycerate kinase
- Pro:
-
Proline
- Se:
-
Selenium
- Ser:
-
Serine
- Si:
-
Silicon
- SS:
-
Sucrose synthase 3
- Thr:
-
Threonine
- TPI:
-
Triosephosphate isomerase
- Tyr:
-
Tyrosine
- Val:
-
Valine
- ZFDP:
-
Zinc finger CCCH domain-containing protein 32
- Zn:
-
Zinc
- 2D:
-
Two-dimensional gel
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Acknowledgements
This work was supported by Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China; China Postdoctoral Science Foundation funded project (2015M570513, 2016T90542), and The Key Research Foundation of Science & Technology Department of Zhejiang Province of China (2009C12050). We deeply appreciate Ms. Mei Li from 985-Institute of Agrobiology and Environmental Science (985-IAES) of Zhejiang University, for her kind help with the experiment.
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Cao, F., Fu, M., Wang, R. et al. Genotypic-dependent effects of N fertilizer, glutathione, silicon, zinc, and selenium on proteomic profiles, amino acid contents, and quality of rice genotypes with contrasting grain Cd accumulation. Funct Integr Genomics 17, 387–397 (2017). https://doi.org/10.1007/s10142-016-0540-x
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DOI: https://doi.org/10.1007/s10142-016-0540-x