Differentially expressed membrane transporters in rice roots may contribute to cultivar dependent salt tolerance

Salinity tolerance in rice, like in other glycophytes, is a function of cellular ion homeostasis. The large divergence in ion homeostasis between the salt-tolerant FL478 and salt-sensitive IR29 rice varieties can be exploited to understand mechanisms of salinity tolerance. Physiological studies indi...

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Bibliographic Details
Published in:Journal of experimental botany 2009-07, Vol.60 (9), p.2553-2563
Main Authors: Senadheera, Prasad, Singh, R.K, Maathuis, Frans J.M
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Amino acid transport systems
ATP binding cassette transporters
Biological and medical sciences
Brackish
Cation Transport Proteins - genetics
Cation Transport Proteins - metabolism
Freshwater
Fundamental and applied biological sciences. Psychology
Gene Expression Regulation, Plant
Genes
Genetics and breeding of economic plants
Membrane Transport Proteins - genetics
Membrane Transport Proteins - metabolism
Monovalent ion uptake
Nitrates
Oryza - genetics
Oryza - physiology
Oryza sativa
Plant Proteins - genetics
Plant Proteins - metabolism
Plant roots
Plant Roots - genetics
Plant Roots - physiology
Plants
Potassium - metabolism
RESEARCH PAPER
Research Papers
Rice
root membrane transporters
Salinity
salinity tolerance
Salt tolerance
Silicon
silicon accumulation-transciptomics
Sodium - metabolism
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Summary:Salinity tolerance in rice, like in other glycophytes, is a function of cellular ion homeostasis. The large divergence in ion homeostasis between the salt-tolerant FL478 and salt-sensitive IR29 rice varieties can be exploited to understand mechanisms of salinity tolerance. Physiological studies indicate that FL478 shows a lower Na+ influx, a reduced Na+ translocation to the shoot, and maintains a lower Na+:K+ ratio. To understand the basis of these differences, a comparative investigation of transcript regulation in roots of the two cultivars was undertaken. This analysis revealed that genes encoding aquaporins, a silicon transporter, and N transporters are induced in both cultivars. However, transcripts for cation transport proteins including OsCHX11, OsCNGC1, OsCAX, and OsTPC1 showed differential regulation between the cultivars. The encoded proteins are likely to participate in reducing Na+ influx, lowering the tissue Na+:K+ ratio and limiting the apoplastic bypass flow in roots of FL478 and are therefore important new targets to improve salt tolerance in rice.
ISSN:0022-0957
1460-2431
DOI:10.1093/jxb/erp099