ArticlePlanta2007
The intron of the Arabidopsis thaliana COX5c gene is able to improve the drought tolerance conferred by the sunflower Hahb-4 transcription factor.
Article in Planta, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Successful field performance in warm and dry environments of soybean expressing the sunflower transcription factor HB4.Journal of experimental botany · 2020Article
- Field-grown transgenic wheat expressing the sunflower gene HaHB4 significantly outyields the wild type.Journal of experimental botany · 2019Article
- Overexpression of OsTF1L, a rice HD-Zip transcription factor, promotes lignin biosynthesis and stomatal closure that improves drought tolerance.Plant biotechnology journal · 2019Article
- Molecular interactions of the γ-clade homeodomain-leucine zipper class I transcription factors during the wheat response to water deficit.Plant molecular biology · 2016Article
Corrections and comments
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Authors and funding
4 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Hahb-4 is a member of Helianthus annuus (sunflower) subfamily I of HD-Zip proteins. Transgenic Arabidopsis thaliana plants constitutively expressing this gene exhibit a strong tolerance of water stress in concert with morphological defects and a delay in development. In order to obtain a drought-tolerant phenotype without morphological associated phenotype, several stress inducible promoters were isolated and transgenic plants expressing Hahb-4 controlled by them were obtained and analyzed. These plants showed unchanged morphology in normal growth conditions and enhanced drought tolerance compared with non-transformed plants, but no as high as the one exhibited by the constitutively transformed genotype. A chimerical construction between the Hahb-4 promoter and the leader intron of the Arabidopsis Cox5c gene was made either directing gus or Hahb-4 expression. GUS activity increased in transgenic plants after induction, showing the same distribution pattern as in plants transformed with a construction lacking the intron. Transgenic plants, bearing the chimerical construct, are indistinguishable from wild type plants in normal growth conditions whereas the water stress tolerance achieved was as strong as the one shown by the constitutive genotype. This enhanced stress tolerance seemed to be due to a combination of an increase in transcription and translation rates in comparison to those of plants transformed with the Hahb-4 promoter. Similar strategies could be applied in the future for the obtaining of suitable promoters responsive to other external agents.
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