Idioma:

Spatial and temporal expression of two cytosolic glutamine synthetase genes in Scots pine : functional implications on nitrogen metabolism during early stages of conifer development

AVILA, Concepcion ; SUAREZ, Maria Fernanda ; GOMEZ-MALDONADO, Josefa ; CANOVAS, Francisco M

The Plant journal : for cell and molecular biology, 2001, Vol.25 (1), p.93-102 [Periódico revisado por pares]

Oxford: Blackwell Science

Texto completo disponível

Citações Citado por

Enviar para

Título:
Spatial and temporal expression of two cytosolic glutamine synthetase genes in Scots pine : functional implications on nitrogen metabolism during early stages of conifer development
Autor: AVILA, Concepcion ; SUAREZ, Maria Fernanda ; GOMEZ-MALDONADO, Josefa ; CANOVAS, Francisco M
Assuntos: Agronomy. Soil science and plant productions ; Biological and medical sciences ; Cycadopsida - enzymology ; Cycadopsida - genetics ; Cytosol - enzymology ; Economic plant physiology ; Fundamental and applied biological sciences. Psychology ; Gene Expression Regulation, Developmental ; Gene Expression Regulation, Enzymologic ; Gene Expression Regulation, Plant ; Glutamate-Ammonia Ligase - genetics ; Hypocotyl - enzymology ; Isoenzymes - genetics ; Metabolism ; Molecular Sequence Data ; Nitrogen - metabolism ; Nitrogen metabolism and other ones (excepting carbon metabolism) ; Nutrition. Photosynthesis. Respiration. Metabolism ; Plant physiology and development ; Plant Roots - enzymology ; RNA, Messenger - genetics ; Seeds - physiology ; Transcription, Genetic ; Trees - enzymology ; Trees - genetics
É parte de: The Plant journal : for cell and molecular biology, 2001, Vol.25 (1), p.93-102
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: Ammonium assimilation during the initial stages of Scots pine growth involves two cytosolic glutamine synthetase (GS, EC: 6.3.1.2) isoenzymes encoded by separate genes, GS1a and GS1b. GS1a was most exclusively expressed in photosynthetic tissues of the seedling whereas GS1b was expressed ubiquitously showing higher levels in non-photosynthetic tissues such as root and hypocotyl. Temporal expression analysis has shown that when germination starts GS1b is the predominant form in the embryo, however, its relative abundance in the tissue decreased in the postgerminative stages when green cotyledons are developed. In contrast GS1a was present at a low level in the embryo but its abundance increased markedly during germination and seedling growth. These data suggest that GS1a and GS1b genes display different and non-redundant roles in the nitrogen metabolism of conifers. The precise localization of individual transcripts by in situ hybridization strongly supports this possibility. GS1 gene products are mainly expressed in different cellular types: GS1a in chlorophylic parenchyma and GS1b in the vascular bundles of all tissues examined in the seedling. Our data support that glutamine biosynthesis in pine seedlings follows a different pattern related to angiosperms involving two cytosolic GS proteins: one of them a typical cytosolic GS which may be involved in the generation of glutamine for N transport and a second cytosolic GS generating amino donors for the biosynthesis of major N compounds in photosynthetic tissues, a closer role to angiosperm chloroplastic GS. The results are discussed with regard to recent studies on N mobilization and metabolism during the initial stages of conifer development.
Editor: Oxford: Blackwell Science
Idioma: Inglês

Links

Voltar para lista de resultados

Realização: Logos de Redes Sociais:

Spatial and temporal expression of two cytosolic glutamine synthetase genes in Scots pine : functional implications on nitrogen metabolism during early stages of conifer development

AVILA, Concepcion ; SUAREZ, Maria Fernanda ; GOMEZ-MALDONADO, Josefa ; CANOVAS, Francisco M

Oxford: Blackwell Science

Buscando em bases de dados remotas. Favor aguardar.