Soil selenium (Se) biofortification changes the physiological, biochemical and epigenetic responses to water stress in Zea mays L. by inducing a higher drought tolerance
| Autor: | Carlo Alberto Palmerini, Roberto D’Amato, Emidio Albertini, Simona Ciancaleoni, Valeria Negri, Daniela Businelli, Gianpiero Marconi, Andrea Onofri, Maria Chiara Fontanella, Marika Bocchini, Gian Maria Beone |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
0301 basic medicine Water stress Drought tolerance Biofortification chemistry.chemical_element Plant Science lcsh:Plant culture Biology 01 natural sciences selenium maize selenium speciation water stress DNA methylation epigenetic 03 medical and health sciences Selenium Settore AGR/13 - CHIMICA AGRARIA lcsh:SB1-1110 Proline Carotenoid Abiotic component chemistry.chemical_classification Phytoene synthase DNA methylation Selenium speciation fungi food and beverages Epigenetic Maize 030104 developmental biology Agronomy chemistry Osmolyte biology.protein 010606 plant biology & botany |
| Zdroj: | Frontiers in Plant Science, Vol 9 (2018) |
| Popis: | Requiring water and minerals to grow and to develop its organs, Maize (Zea mays L.) production and distribution is highly rainfall-dependent. Current global climatic changes reveal irregular rainfall patterns and this could represent for maize a stressing condition resulting in yield and productivity loss around the world. It is well known that low water availability leads the plant to adopt a number of metabolic alterations to overcome stress or reduce its effects. In this regard, selenium (Se), a trace element, can help reduce water damage caused by the overproduction of reactive oxygen species (ROS). Here we report the effects of exogenous Se supply on physiological and biochemical processes that may influence yield and quality of maize under drought stress conditions. Plants were grown in soil fertilized by adding 150 mg of Se (sodium selenite). We verified the effects of drought stress and Se treatment. Selenium biofortification proved more beneficial for maize plants when supplied at higher Se concentrations. The increase in proline, K concentrations and nitrogen metabolism in aerial parts of plants grown in Se-rich substrates, seems to prove that Se-biofortification increased plant resistance to water shortage conditions. Moreover, the increase of SeMeSeCys and SeCys2 forms in roots and aerial parts of Se-treated plants suggest resistance strategies to Se similar to those existing in Se-hyperaccumulator species. In addition, epigenetic changes in DNA methylation due to water stress and Se treatment were also investigated using methylation sensitive amplified polymorphism (MSAP). Results suggest that Se may be an activator of particular classes of genes that are involved in tolerance to abiotic stresses. In particular, PSY (phytoene synthase) gene, essential for maintaining leaf carotenoid contents, SDH (sorbitol dehydrogenase), whose activity regulates the level of important osmolytes during drought stress and ADH (alcohol dehydrogenase), whose activity plays a central role in biochemical adaptation to environmental stress. In conclusion, Se-biofortification could help maize plants to cope with drought stress conditions, by inducing a higher drought tolerance. |
| Databáze: | OpenAIRE |
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