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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Mishra, Kumud Bandhu Iannacone, Rina Petrozza, Angelo Mishra, Anamika Armentano, Nadia La Vecchia, Giovanna Trtílek, Martin Cellini, Francesco Nedbal, Ladislav |
| Description | Country affiliation: Czech Republic Author Affiliation: Mishra KB ( CzechGlobe - Global Change Research Centre, Academy of Sciences of the Czech Republic, Zámek 136, 37333 Nové Hrady, Czech Republic. mishra@greentech.cz) |
| Abstract | Drought stress is one of the most important factors that limit crop productivity worldwide. In order to obtain tomato plants with enhanced drought tolerance, we inserted the transcription factor gene ATHB-7 into the tomato genome. This gene was demonstrated earlier to be up-regulated during drought stress in Arabidopsis thaliana thus acting as a negative regulator of growth. We compared the performance of wild type and transgenic tomato line DTL-20, carrying ATHB-7 gene, under well-irrigated and water limited conditions. We found that transgenic plants had reduced stomatal density and stomatal pore size and exhibited an enhanced resistance to soil water deficit. We used the transgenic plants to investigate the potential of chlorophyll fluorescence to report drought tolerance in a simulated high-throughput screening procedure. Wild type and transgenic tomato plants were exposed to drought stress lasting 18 days. The stress was then terminated by rehydration after which recovery was studied for another 2 days. Plant growth, leaf water potential, and chlorophyll fluorescence were measured during the entire experimental period. We found that water potential in wild type and drought tolerant transgenic plants diverged around day 11 of induced drought stress. The chlorophyll fluorescence parameters: the non-photochemical quenching, effective quantum efficiency of PSII, and the maximum quantum yield of PSII photochemistry yielded a good contrast between wild type and transgenic plants from day 7, day 12, and day 14 of induced stress, respectively. We propose that chlorophyll fluorescence emission reports well on the level of water stress and, thus, can be used to identify elevated drought tolerance in high-throughput screens for selection of resistant genotypes. |
| File Format | HTM / HTML |
| ISSN | 01689452 |
| Volume Number | 182 |
| e-ISSN | 18732259 |
| Journal | Plant Science |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2012-01-01 |
| Publisher Place | Ireland |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Botany Droughts Lycopersicon Esculentum Growth & Development Genetics Stress, Physiological Adaptation, Physiological Chlorophyll Metabolism Dehydration Gene Expression Regulation, Plant Gene Transfer Techniques Genes, Plant Genetic Variation Plant Leaves Plant Stomata Physiology Plants, Genetically Modified Transcription, Genetic Comparative Study Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Genetics Plant Science Medicine Agronomy and Crop Science |
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