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Title: Sulphur deprivation limits Fe-deficiency responses in tomato plants
Authors: Zuchi, Sabrina
Cesco, Stefano
Varanini, Zeno
Pinton, Roberto
Astolfi, Stefania
Keywords: Ethylene;Iron defciency;Iron uptake;Sulphur defciency;Strategy I;Tomato
Issue Date: 2009
Publisher: Springer-Verlag
Source: Zuchi, S. et al. 2009. Sulphur deprivation limits Fe-deficiency responses in tomato plants. "Planta" 1(230): 85-94.
Aim of this work was to clarify the role of S supply in the development of the response to Fe depletion in Strategy I plants. In S-sufficient plants, Fe-deficiency caused an increase in the Fe(III)-chelate reductase activity, 59Fe uptake rate and ethylene production at root level. This response was associated with increased expression of LeFRO1 (Fe(III)-chelate reductase) and LeIRT1 (Fe2+ transporter) genes. Instead, when S-deficient plants were transferred to a Fe-free solution, no induction of Fe(III)-chelate reductase activity and ethylene production was observed. The same held true for LeFRO1 gene expression, while the increase in 59Fe2+ uptake rate and LeIRT1 gene over-expression were limited. Sulphur deficiency caused a decrease in total sulphur and thiol content; a concomitant increase in 35SO42- uptake rate was observed, this behaviour being particularly evident in Fe-deficient plants. Sulphur deficiency also virtually abolished expression of the nicotianamine synthase gene (LeNAS), independently of the Fe growth conditions. Sulphur deficiency alone also caused a decrease in Fe content of tomato leaves and an increase in root ethylene production; however these events were not associated with either increased Fe(III)-chelate reductase activity, higher rates of 59Fe uptake, or over-expression of either LeFRO1 or LeIRT1 genes. Results show that S-deficiency could limit the capacity of tomato plants to cope with Fe-shortage by preventing the induction of the Fe(III)-chelate reductase and limiting the activity and expression of the Fe2+ transporter. Furthermore, the results support the idea that ethylene alone cannot trigger specific Fe-deficiency physiological responses in a Strategy I plant, such as tomato.
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DOI: 10.1007/s00425-009-0919-1
Appears in Collections:DABAC - Archivio della produzione scientifica

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