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Proteomic analysis of drought-responsive proteins in rice reveals photosynthesis-related adaptations to drought stress

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Abstract

Drought stress inhibits rice growth and biomass accumulation. To identify novel regulators of drought-stress responses in rice, we conducted a proteome-level study of the stress-susceptible (SS) Oryza sativa L. cv. ‘Leung Pratew 123’ and its stress-resistant (SR) somaclonal mutant line. In response to osmotic-stress treatments, 117 proteins were differentially accumulated, with 62 and 49 of these proteins detected in the SS and SR rice lines, respectively. There were six proteins that accumulated in both lines. The proteins in the SS line were mainly related to metabolic processes, whereas the proteins identified in the SR line were primarily related to retrotransposons. These observations suggest that retrotransposons may influence the epigenetic regulation of gene expression in response to osmotic stress. To identify the biological processes associated with drought tolerance in rice, we conducted a co-expression network analysis of 55 proteins that were differentially accumulated in the SR line under osmotic-stress conditions. We identified a major hub gene; LOC_Os04g38600 (encoding a glyceraldehyde-3-phosphate dehydrogenase), suggesting that photosynthetic adaptation via NADP(H) homeostasis contributes to drought tolerance in rice.

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Abbreviations

AKT1:

Inward-rectifier K+ channel

GAPDH:

Glyceraldehyde-3-phosphate dehydrogenase

GAPB:

GAPDH β subunit

GeLC–MS/MS:

Gel-based liquid chromatography–tandem mass spectrometry

GORK:

Guard cell ‘outward-rectifying’ K+ channel

NBS-LRR:

Nucleotide-binding site–leucine-rich repeat

OSBPs:

Oxysterol-binding proteins

PEG6000:

Polyethylene glycol 6000

PP2C:

Protein phosphatase 2C

PPR:

Pentatricopeptide repeat

SKOR:

Stelar K+ ‘outward-rectifying’ channel

SR:

Stress resistant

SS:

Stress susceptible

TE:

Transposable element

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Acknowledgements

This work was supported by the Ratchadaphiseksompoj Research Fund, Chulalongkorn University (Grant No. CU-57-011-FW). NC was supported by the Science Achievement Scholarship of Thailand. MM was supported by DPST. OSBC was supported by CUAASC.

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Correspondence to Supachitra Chadchawan.

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Communicated by M. Hajduch.

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Chintakovid, N., Maipoka, M., Phaonakrop, N. et al. Proteomic analysis of drought-responsive proteins in rice reveals photosynthesis-related adaptations to drought stress. Acta Physiol Plant 39, 240 (2017). https://doi.org/10.1007/s11738-017-2532-4

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  • DOI: https://doi.org/10.1007/s11738-017-2532-4

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