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Heterologous expression of the AtDREB1A gene in chrysanthemum increases drought and salt stress tolerance

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Abstract

DNA cassette containing an AtDREB1A cDNA and a nos terminator, driven by a cauliflower mosaic 35S promoter, or a stress-inducible rd29A promoter, was transformed into the ground cover chrysanthemum (Dendranthema grandiflorum) ‘Fall Color’ genome. Compared with wild type plants, severe growth retardation was observed in 35S:DREB1A plants, but not in rd29A:DREB1A plants. RT-PCR analysis revealed that, under stress conditions, the DREB1A gene was over-expressed constitutively in 35S:DREB1A plants, but was over-expressed inductively in rd29A:DREB1A plants. The transgenic plants exhibited tolerance to drought and salt stress, and the tolerance was significantly stronger in rd29A:DREB1A plants than in 35S:DREB1A plants. Proline content and SOD activity were increased inductively in rd29A:DREB1A plants than in 35S:DREB1A plants under stress conditions. These results indicate that heterologous AtDREB1A can confer drought and salt tolerance in transgenic chrysanthemum, and improvement of the stress tolerance may be related to enhancement of proline content and SOD activity.

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Authors and Affiliations

  1. Department of Ornamental Horticulture and Landscape Architecture, China Agricultural University, Beijing, 100094, China

    Hong Bo, Tong Zheng, Ma Nan, Li Jianke & Gao Junping

  2. College of Landscape Architecture, Northeast Forestry University, Harbin, 150040, China

    Hong Bo

  3. Biological Resources Division, Japan International Research Center for Agricultural Sciences, 1-1 Ohwashi, Tsukuba, Ibaraki, 305-8686, Japan

    Kasuga Mie & Yamaguchi-Shinozaki Kazuko

Authors
  1. Hong Bo
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  2. Tong Zheng
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  3. Ma Nan
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  4. Li Jianke
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  5. Kasuga Mie
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  6. Yamaguchi-Shinozaki Kazuko
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  7. Gao Junping
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Correspondence to Gao Junping.

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Hong, B., Tong, Z., Ma, N. et al. Heterologous expression of the AtDREB1A gene in chrysanthemum increases drought and salt stress tolerance. SCI CHINA SER C 49, 436–445 (2006). https://doi.org/10.1007/s11427-006-2014-1

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  • DOI: https://doi.org/10.1007/s11427-006-2014-1

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