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Cloning of two contrasting high-affinity sulfate transporters from tomato induced by low sulfate and infection by the vascular pathogen Verticillium dahliae

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Abstract

Two cDNAs, LeST1-1 (AF347613) and LeST1-2 (AF347614), encoding sulfate transporters have been cloned from tomato (Lycopersicon esculentum Mill.) by reverse transcription–polymerase chain reaction and their expression characterised. Sharing 76% identity at the amino acid level, the transporters are phylogenetically associated with the Group-1, high-affinity plant sulfate transporters. Both were shown to have high affinity for sulfate by uptake kinetic analysis using a yeast (Saccharomyces cerevisiae) sulfate-transporter mutant. K m values of 11.5 μM and 9.8 μM were calculated for LeST1-1 and LeST1-2, respectively, the same order of magnitude as those previously reported for several other Group-1 high-affinity sulfate transporters. In situ hybridisation to S-deficient tomato roots showed LeST1-1 to be expressed in the epidermis and pericycle, whereas LeST1-2 expression was located to the epidermis only. Northern analysis shows that the mRNA abundances of both LeST1-1 and LeST1-2 are upregulated in the root in response to sulfate deprivation. LeST1-1 is specifically expressed in root tissue, a characteristic of Group-1 sulfate transporters. LeST1-2, however, was also detected in tomato leaves and stems and is upregulated and expressed to a similar extent in these tissues under conditions of sulfate deprivation. Induction of LeST1-2 expression was also observed in the vascular tissues of a resistant line of tomato infected with the vascular wilt pathogen Verticillium dahliae.

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Abbreviations

APSR:

adenosine 5′-phosphosulfate reductase

dpi:

days post-infection

RT–PCR:

reverse transcription–polymerase chain reaction

S:

sulfur

ST:

sulfate transporter

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Acknowledgements

We acknowledge Jane Williams and Richard Cooper at the University of Bath, UK, for growth and infection of tomato material, Nicole Cathala at BPMP Montpellier for yeast transformation and Peter Buchner, Gordon Forbes, Laura Hopkins, Saroj Parmar and Katie Tearall for their assistance. Rothamsted Research receives grant-aided support from the Biotechnology and Biological Sciences Research Council (BBSRC) of the UK. This research was supported by a BBSRC ROPA award (206/9912300), DEFRA Programme AR09 and the British Council.

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Correspondence to Malcolm J. Hawkesford.

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Howarth, J.R., Fourcroy, P., Davidian, JC. et al. Cloning of two contrasting high-affinity sulfate transporters from tomato induced by low sulfate and infection by the vascular pathogen Verticillium dahliae . Planta 218, 58–64 (2003). https://doi.org/10.1007/s00425-003-1085-5

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