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

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 main...

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Published in:Physiology and molecular biology of plants 2020-07, Vol.26 (7), p.1349-1359
Main Authors: Gindri, Rafael Gonçalves, Navarro, Bruno Bachiega, da Cruz Dias, Pedro Vinicius, Tarouco, Camila Peligrinotti, Nicoloso, Fernando Teixeira, Brunetto, Gustavo, Berghetti, Álvaro Luís Pasquetti, da Silva, Lincon Oliveira Stefanello, Fett, Janette Palma, Menguer, Paloma Koprovski, Ricachenevsky, Felipe Klein
Format: Article
Language:English
Subjects:
Biological and Medical Physics
Biomedical and Life Sciences
Biophysics
Cell Biology
Deregulation
Grain
Homeostasis
Life Sciences
Micronutrients
Minerals
Photosynthesis
Physiological responses
Physiology
Plant Physiology
Plant Sciences
Research Article
Rice
Seeds
Shoots
Zinc
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Summary: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.
ISSN:0971-5894
0974-0430
DOI:10.1007/s12298-020-00824-z