Journal
FUNCTIONAL PLANT BIOLOGY
Volume 35, Issue 4, Pages 318-327Publisher
CSIRO PUBLISHING
DOI: 10.1071/FP07283
Keywords
hydrogen sulfide; sulphate transporters; sulphate uptake; sulfur deficiency; thiols
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Funding
- Biotechnology and Biological Sciences Research Council [BBS/E/C/00004955] Funding Source: Medline
- BBSRC [BBS/E/C/00004955] Funding Source: UKRI
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The activity and expression of sulfate transporters and adenosine 5'-phosphosulfate (APS) reductase (APR) in plants are modulated by the plant sulfur status and the demand for growth. To elucidate regulatory mechanisms in Chinese cabbage [Brassica pekinensis (Lour.) Rupr.], the interactions between atmospheric H2S and sulfate nutrition and the impact on the activity and expression of the Group I sulfate transporters and APR were studied. At an ample sulfate supply, H2S exposure of Chinese cabbage resulted in a partial decrease of the sulfate uptake capacity, and at concentrations >= 0.25 mu L L-1 a decreased expression of Sultr1;2 in the root and APR in the root and shoot. Upon sulfate deprivation there was a more than 3-fold increase in the sulfate uptake capacity of the root, accompanied by an induced expression of Sultr1;1 and an enhanced expression of Sultr1;2 in the root, along with an induction of Sultr1;2 in the shoot. The enhanced sulfate uptake capacity, the expression of the sulfate transporters in the root and the altered shoot-to-root partitioning appearing during sulfate deprivation were not alleviated upon H2S exposure and not rapidly affected by sulfate re-supply. Expression of APR was strongly enhanced in the root and shoot of sulfate-deprived plants and decreased again upon H2S exposure and sulfate re-supply. The significance of shoot-to-root interaction and sulfate and thiols as regulating signals in the activity and expression of Sultr1;1 and 1;2 is evaluated.
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