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Genomic analysis and expression pattern of OsZIP1, OsZIP3, and OsZIP4 in two rice (Oryza sativa L.) genotypes with different zinc efficiency

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Abstract

The ZRT-and IRT-like proteins (ZIP) comprise a large family of transition metal transporters in plants that have diverse functions to transport zinc, iron, copper, etc. Here, we provided a complete overview of this gene family in rice (Oryza sativa L.). Based on the hidden Markov model and BLAST analysis, a total of 17 ZIP-coding genes were identified and further studied by semi-quantitative RT-PCR analysis. Sequence analysis revealed 17 putative genes distributed randomly on eight chromosomes. Although most of the predicted proteins had typical characteristics of the ZIP protein family, the extent of their sequence similarity varied considerably. The expression patterns of OsZIP1, OsZIP3, and OsZIP4, which encode Zn2+ transporters in rice, were studied in the Zn-efficient and Zn-inefficient rice genotypes (IR8192 and Erjiufeng) by semi-quantitative RT-PCR analysis of roots, shoots, and panicle from the plants grown under Zn deficiency and normal conditions. OsZIP1 was expressed only in the roots and very weakly if at all in the panicles, while the other two genes were expressed in all parts of plants under study. The Zn-deficient conditions up-regulated the expression of OsZIP1, OsZIP3, and OsZIP4 in the roots and that of OsZIP4 in the shoots of both genotypes, indicating that all these genes may participate in rice zinc nutrition. Furthermore, the expression of OsZIP3 and OsZIP4 was found to be much stronger in the roots of IR8192 than those of Erjiufeng, which suggests that these genes may contribute to high Zn efficiency in rice. The expression patterns and the roles of other OsZIPs are also discussed on the basis of the phylogenetic tree of ZIP proteins and RT-PCR analysis of the two rice genotypes with different zinc efficiency.

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Abbreviations

HMM:

hidden Markov model

ICP-MS:

inductively coupled plasma mass spectrometer

IRT1:

iron-regulated transporter

TM:

transmembrane domains

ZIP:

ZRT, IRT-like protein

ZRT:

zinc-regulated transporter

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Correspondence to Y. Feng.

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Original Russian Text © W.R. Chen, Y. Feng, Y.E. Chao, X.E. Yang, 2008, published in Fiziologiya Rastenii, 2008, Vol. 55, No. 3, pp. 441–452.

This text was submitted by the authors in English.

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Chen, W.R., Feng, Y. & Chao, Y.E. Genomic analysis and expression pattern of OsZIP1, OsZIP3, and OsZIP4 in two rice (Oryza sativa L.) genotypes with different zinc efficiency. Russ J Plant Physiol 55, 400–409 (2008). https://doi.org/10.1134/S1021443708030175

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