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Soybean ureide transporters play a critical role in nodule development, function and nitrogen export

Collier, Ray ; Tegeder, Mechthild

The Plant journal : for cell and molecular biology, 2012-11, Vol.72 (3), p.355-367 [Periódico revisado por pares]

Oxford, UK: Blackwell Publishing Ltd

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Título:
Soybean ureide transporters play a critical role in nodule development, function and nitrogen export
Autor: Collier, Ray ; Tegeder, Mechthild
Assuntos: allantoic acid ; allantoin ; Allantoin - metabolism ; Biological and medical sciences ; Biological Transport ; Cell differentiation, maturation, development, hematopoiesis ; Cell physiology ; cortex ; endodermis ; Fundamental and applied biological sciences. Psychology ; Gene Expression Regulation, Plant ; Glycine max - cytology ; Glycine max - genetics ; Glycine max - growth & development ; Glycine max - physiology ; legume ; Legumes ; Membrane Transport Proteins - genetics ; Membrane Transport Proteins - metabolism ; Metabolism ; Metabolism. Physicochemical requirements ; Molecular and cellular biology ; Nicotiana - genetics ; Nicotiana - metabolism ; Nitrogen ; Nitrogen - metabolism ; Nitrogen Fixation ; Nitrogenase - metabolism ; nodule development ; Phenotype ; Plant ecology ; Plant physiology and development ; Plant Proteins - genetics ; Plant Proteins - metabolism ; Plant Root Nodulation ; Plant Roots - cytology ; Plant Roots - genetics ; Plant Roots - growth & development ; Plant Roots - physiology ; Plant Shoots - cytology ; Plant Shoots - genetics ; Plant Shoots - growth & development ; Plant Shoots - physiology ; Plant Vascular Bundle - cytology ; Plant Vascular Bundle - genetics ; Plant Vascular Bundle - growth & development ; Plant Vascular Bundle - physiology ; Plants, Genetically Modified ; plasma membrane ; RNA Interference ; root nodules ; Root Nodules, Plant - cytology ; Root Nodules, Plant - genetics ; Root Nodules, Plant - growth & development ; Root Nodules, Plant - physiology ; shoots ; Soybeans ; Symbiosis ; transporters ; Urea - analogs & derivatives ; Urea - metabolism ; ureide export ; Yeasts - genetics ; Yeasts - metabolism
É parte de: The Plant journal : for cell and molecular biology, 2012-11, Vol.72 (3), p.355-367
Notas: http://dx.doi.org/10.1111/j.1365-313X.2012.05086.x
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Descrição: Legumes can access atmospheric nitrogen through a symbiotic relationship with nitrogen‐fixing bacteroids that reside in root nodules. In soybean, the products of fixation are the ureides allantoin and allantoic acid, which are also the dominant long‐distance transport forms of nitrogen from nodules to the shoot. Movement of nitrogen assimilates out of the nodules occurs via the nodule vasculature; however, the molecular mechanisms for ureide export and the importance of nitrogen transport processes for nodule physiology have not been resolved. Here, we demonstrate the function of two soybean proteins – GmUPS1‐1 (XP_003516366) and GmUPS1‐2 (XP_003518768) – in allantoin and allantoic acid transport out of the nodule. Localization studies revealed the presence of both transporters in the plasma membrane, and expression in nodule cortex cells and vascular endodermis. Functional analysis in soybean showed that repression of GmUPS1‐1 and GmUPS1‐2 in nodules leads to an accumulation of ureides and decreased nitrogen partitioning to roots and shoot. It was further demonstrated that nodule development, nitrogen fixation and nodule metabolism were negatively affected in RNAi UPS1 plants. Together, we conclude that export of ureides from nodules is mediated by UPS1 proteins, and that activity of the transporters is not only essential for shoot nitrogen supply but also for nodule development and function.
Editor: Oxford, UK: Blackwell Publishing Ltd
Idioma: Inglês

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Soybean ureide transporters play a critical role in nodule development, function and nitrogen export

Collier, Ray ; Tegeder, Mechthild

Oxford, UK: Blackwell Publishing Ltd

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