Abstract
Drought is one of the most important constraints on the growth and productivity of many crops, including soybeans. However, as a primary sensing organ, the plant root response to drought has not been well documented at the proteomic level. In the present study, we carried out a proteome analysis in combination with physiological analyses of soybean roots subjected to severe but recoverable drought stress at the seedling stage. Drought stress resulted in the increased accumulation of reactive oxygen species and subsequent lipid peroxidation. The proline content increased in drought-stressed plants and then decreased during the period of recovery. The high-resolution proteome map demonstrated significant variations in about 45 protein spots detected on Comassie briliant blue-stained 2-DE gels. Of these, 28 proteins were identified by mass spectrometry; the levels of 5 protein spots were increased, 21 were decreased and 2 spots were newly detected under drought condition. When the stress was terminated by watering the plants for 4 days, in most cases, the protein levels tended towards the control level. The proteins identified in this study are involved in a variety of cellular functions, including carbohydrate and nitrogen metabolism, cell wall modification, signal transduction, cell defense and programmed cell death, and they contribute to the molecular mechanism of drought tolerance in soybean plants. Analysis of protein expression patterns revealed that proteins associated with osmotic adjustment, defense signaling and programmed cell death play important roles for soybean plant drought adaptation. The identification of these proteins provides new insight that may lead to a better understanding of the molecular basis of the drought stress responses.
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Abbreviations
- 2-DE:
-
Two-dimensional gel electrophoresis
- MALDI-TOF:
-
Matrix-assisted laser desorption ionization time-of-flight
- PMF:
-
Peptide mass fingerprinting
- ROS:
-
Reactive oxygen species
- SDS-PAGE:
-
Sodium dodecylsulfate polyacrylamide gel electrophoresis
- TBARS:
-
Thiobarbituric acid reactive substance
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Acknowledgments
This work was supported by the Korea Research Foundation Grant funded by the Korean Government (KRF-2007-211-F00006 and KRF-F00065). I. Alam, S.A. Sharmin and K.H. Kim are supported by the BK21 program at Gyeongsang National University, Republic of Korea.
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Alam, I., Sharmin, S.A., Kim, KH. et al. Proteome analysis of soybean roots subjected to short-term drought stress. Plant Soil 333, 491–505 (2010). https://doi.org/10.1007/s11104-010-0365-7
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DOI: https://doi.org/10.1007/s11104-010-0365-7