Abstract
Transient and long-term shortages of fresh water are major adverse environmental factors that cause dramatic reductions in crop production and distribution globally. In this study, we isolated a full-length CaSRP1 (Capsicum annuum stress-related protein 1) cDNA, which was rapidly induced by dehydration in hot pepper plants. The predicted CaSRP1 protein sequence exhibited significant amino acid identity to putative stress-related proteins and the small rubber particle protein (SRPP) found in rubber trees (Hevea brasiliensis). To study the cellular functions of CaSRP1, transgenic Arabidopsis plants (35S:CaSRP1) that constitutively expressed the CaSRP1 gene were constructed. Overexpression of CaSRP1 resulted in enhanced root and shoot growth and earlier bolting in the transgenic plants relative to wild-type plants. In addition, 35S:CaSRP1 overexpressors exhibited enhanced tolerance to drought stress as compared to the control plants. These results suggest that CaSRP1 plays dual functions as a positive factor for tissue growth and development and for drought-defensive responses. A possible cellular function of SRPP homologs in non-rubber-producing plants in relation to drought stress tolerance is discussed.
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Abbreviations
- CaSRP1:
-
Capsicum annuum stress-related protein 1
- DW:
-
Dry weight
- GHS:
-
Guayule homolog of SRPP
- PCR:
-
Polymerase chain reaction
- SRPP:
-
Small rubber particle protein
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Acknowledgments
This work was supported by grants from the Technology Development Program for Agriculture and Forestry (Project No. 309017-5 funded by the Ministry for Agriculture, Forestry and Fisheries, Republic of Korea), the National Research Foundation (Project No. 2009-0078317 funded by the Ministry of Education, Science, and Technology, Republic of Korea), and the BioGreen 21 Program (funded by the Rural Development Administration).
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The nucleotide sequence data reported here has been deposited in the GenBank database under accession number GU373985 (CaSRP1).
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Kim, E.Y., Seo, Y.S., Lee, H. et al. Constitutive expression of CaSRP1, a hot pepper small rubber particle protein homolog, resulted in fast growth and improved drought tolerance in transgenic Arabidopsis plants. Planta 232, 71–83 (2010). https://doi.org/10.1007/s00425-010-1149-2
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DOI: https://doi.org/10.1007/s00425-010-1149-2