Sulfur and plant ecology: a central role of sulfate transporters in responses to sulfur availability

Hawkesford, Malcolm J.

doi:10.1007/978-1-4020-5887-5_1

Cited by 10 publications

(19 citation statements)

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“…For instance, Arabidopsis , Brassica , rice, and wheat contain 10 -14 different sulfate transporter genes. The sulfate transporters have been classifi ed in up to fi ve different groups according to their cellular and subcellular expression and possible functioning in the plant (Hawkesford, 2003(Hawkesford, , 2007(Hawkesford, , 2008Buchner et al, 2004aBuchner et al, ,b, 2010Hawkesford and De Kok, 2006 ;Parmar et al, 2007 ).…”

Section: Sulfur Nutrition In Crop Plantsmentioning

confidence: 99%

“…The uptake of sulfate by the root plasma membrane is mediated by so -called highaffi nity Group 1 sulfate transporters, which have an apparent K m for sulfate around 1.5 -10 μ M (Clarkson et al, 1993 ;Smith et al, 1995Smith et al, , 1997Davidian et al, 2000 ;Hawkesford and Wray, 2000 ;Hawkesford, 2003Hawkesford, , 2007Hawkesford, , 2008Smith and Diatloff, 2005 ;Hawkesford and De Kok 2006 ). Within Group 1 in Arabidopsis , three different sulfate transporters have been characterized.…”

Section: Sulfur Nutrition In Crop Plantsmentioning

confidence: 99%

“…The (bi) sulfi te formed may be directly assimilated into organic sulfur compounds or enzymatically or nonenzymatically oxidized to sulfate and subsequently transferred into the vacuoles (De . In contrast to SO 2 , the uptake of H 2 S by the shoot appears to be determined by the rate of its metabolism into cysteine in the mesophyll cells rather than stomatal opening (De Kok and Tausz, 2001 ;De Kok et al, 2002b, 2007. Evidently, atmospheric levels of ≥ 0.05 μ l L − 1 SO 2 and H 2 S may substantially contribute to plant sulfur nutrition .…”

Section: Sulfur Nutrition In Crop Plantsmentioning

confidence: 99%

“…These transporters are localized in the tonoplast and appear to function in the vacuolar unloading of sulfate (Kataoka et al, 2004b ;Takahashi, 2005 ;Hawkesford, 2007Hawkesford, , 2008.…”

Section: Sulfate Uptake Distribution and Assimilation In Plantsmentioning

confidence: 99%

“…14.1 ). APS may also be further phosphorylated by Moreover, sulfate -selective anion channels may also play a role in the radial movement of sulfate from the epidermis to the xylem (Hawkesford, 2007 ).…”

Section: Sulfate Uptake Distribution and Assimilation In Plantsmentioning

confidence: 99%

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Sulfur Nutrition in Crop Plants

Kok

Stulen

Hawkesford

2011

The Molecular and Physiological Basis of Nutrient Use Efficiency in Crops

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Sulfur is an essential element for plant growth, and together with nitrogen it is necessary for the synthesis of amino acids, proteins, and various other cellular components, including thiol compounds and so -called secondary sulfur compounds, which play an important role in the protection of plants against stress and pests. Sulfur fertilization is often necessary to obtain optimal crop yield and quality. The timing and form of sulfur fertilizer is of great importance since the rate of remobilization of sulfur from older to young tissue can be low in some crops. Sulfate moving through the soil toward the surface of root by mass/bulk fl ow and taken up with high affi nity by the roots (apparent K m < 10 μ M), is the primary sulfur source for plants. The sulfate is reduced in the chloroplasts/plastids prior to its assimilation into organic sulfur compounds. The uptake of sulfate by the root is a primary controlling factor in plant sulfur nutrition and is adjusted to the sulfur demand for growth. The uptake and distribution of sulfate in the plants is mediated by distinct sulfate transporters. Both the expression and activity of the sulfate transporters and adenosine 5 ′ phosphosulfate (APS) reductase, the key enzyme of the sulfate reduction pathway, are modulated by the sulfur nutritional status. The signal transduction pathway in the regulation of the sulfate transporters is not well elucidated. It is uncertain to what extent the measurement of changes in concentrations of potential signal compounds, determined at the whole -plant organ level, provides suffi cient insight into the actual regulatory control of the sulfate uptake at the cellular level. Furthermore, a key unresolved issue is the signal transduction pathway in the crosstalk between the sulfate reduction pathway in the chloroplasts/plastids and the transcription of sulfate transporters/sulfate -reducing enzymes in the nucleus. With the recent appearance of sulfur defi ciency in agricultural systems and the awareness of the importance in quality and stress resistance, possibilities for targeting improvements in sulfur use effi ciency may be required and are discussed.The Molecular and Physiological Basis of Nutrient Use Effi ciency in Crops, First Edition. Edited by Malcolm J. Hawkesford, Peter Barraclough.

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Section: Sulfur Nutrition In Crop Plantsmentioning

confidence: 99%

Section: Sulfur Nutrition In Crop Plantsmentioning

confidence: 99%

Section: Sulfur Nutrition In Crop Plantsmentioning

confidence: 99%

“…These transporters are localized in the tonoplast and appear to function in the vacuolar unloading of sulfate (Kataoka et al, 2004b ;Takahashi, 2005 ;Hawkesford, 2007Hawkesford, , 2008.…”

Section: Sulfate Uptake Distribution and Assimilation In Plantsmentioning

confidence: 99%

Section: Sulfate Uptake Distribution and Assimilation In Plantsmentioning

confidence: 99%

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