Physiological responses of rice ( Oryza sativa L.) oszip7 loss-of-function plants exposed to varying Zn concentrations.

Autor: Gindri RG; Programa de Pós Graduação em Agrobiologia, Universidade Federal de Santa Maria, Santa Maria, Brazil., Navarro BB; Programa de Pós Graduação em Agrobiologia, Universidade Federal de Santa Maria, Santa Maria, Brazil., da Cruz Dias PV; Curso de Agronomia, Centro de Ciências Rurais, Universidade Federal de Santa Maria, Av. Roraima 1000, Prédio 16, Sala 3254, Santa Maria, Rio Grande Do Sul CEP 97105-900 Brazil., Tarouco CP; Programa de Pós Graduação em Agrobiologia, Universidade Federal de Santa Maria, Santa Maria, Brazil., Nicoloso FT; Programa de Pós Graduação em Agrobiologia, Universidade Federal de Santa Maria, Santa Maria, Brazil.; Departamento de Biologia, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria, Brazil., Brunetto G; Programa de Pós Graduação em Ciência do Solo, Centro de Ciências Rurais, Universidade Federal de Santa Maria, Santa Maria, Brazil., Berghetti ÁLP; Centro de Ciências Rurais, Programa de Pós graduação em Engenharia Florestal, Universidade Federal de Santa Maria, Santa Maria, Brazil., da Silva LOS; Programa de Pós Graduação em Ciência do Solo, Centro de Ciências Rurais, Universidade Federal de Santa Maria, Santa Maria, Brazil., Fett JP; Departamento de Botânica, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.; Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil., Menguer PK; Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil., Ricachenevsky FK; Programa de Pós Graduação em Agrobiologia, Universidade Federal de Santa Maria, Santa Maria, Brazil.; Departamento de Biologia, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria, Brazil.; Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
Jazyk: angličtina
Zdroj: Physiology and molecular biology of plants : an international journal of functional plant biology [Physiol Mol Biol Plants] 2020 Jul; Vol. 26 (7), pp. 1349-1359. Date of Electronic Publication: 2020 Jun 16.
DOI: 10.1007/s12298-020-00824-z
Abstrakt: Rice is a daily staple for half of the world's population. However, rice grains are poor in micronutrients such as Fe and Zn, the two most commonly deficient minerals in the human diet. In plants, Fe and Zn must be absorbed from the soil, distributed and stored, so that their concentrations are maintained at sufficient but non-toxic levels. The understanding of mechanisms of Fe and Zn homeostasis in plants has the potential to benefit agriculture, improving the use of micronutrients by plants, as well as to indicate approaches that aim at biofortification of the grains. ZIP transporters are commonly associated with Zn uptake, but there are few reports about their physiological relevance in planta . Here we describe a Tos17 loss-of-function line for the Zn plasma membrane transporter OsZIP7 ( oszip7 ). We showed that the absence of functional OsZIP7 leads to deregulated Zn partitioning, increasing Zn accumulation in roots but decreasing in shoots and seeds. We also demonstrated that, upon Zn deficiency, oszip7 plants slightly increase their photosynthetic performance, suggesting that these plants might be primed for Zn deficiency which makes them more tolerant. On the other hand, we found that Zn excess is more deleterious to oszip7 plants compared to wild type, which may be linked to secondary effects in concentrations of other elements such as Fe. Our data suggest that OsZIP7 is important for Zn homeostasis under physiological Zn concentrations, and that Fe homeostasis might be affected due to loss of function of OsZIP7.
(© Prof. H.S. Srivastava Foundation for Science and Society 2020.)
Databáze: MEDLINE
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