IIB   20738
INSTITUTO DE INVESTIGACIONES BIOLOGICAS
Unidad Ejecutora - UE
artículos
Título:
Nitric oxide: an active nitrogen molecule that modulates cellulose synthesis in tomato roots
Autor/es:
CORREA-ARAGUNDE NATALIA; LOMBARDO CRISTINA; LAMATTINA LORENZO
Revista:
NEW PHYTOLOGIST
Editorial:
Blackwell
Referencias:
Año: 2008 vol. 179 p. 386 - 396
ISSN:
0028-646X
Resumen:
Nitric oxide (NO) is a bioactive molecule involved in several growth and developmental processes in plants. These processes are mostly characterized by changes in primary and secondary metabolism. Here, the effect of NO on cellulose synthesis in tomato (Solanum lycopersicum) roots was studied. The phenotype of roots, cellulose content, the incorporation of 14C-glucose into cellulosic fraction and the expression of tomato cellulose synthase (CESA) transcripts in roots treated with the NO donor sodium nitroprusside (SNP) were analysed. Nitric oxide affected cellulose content in roots in a dose dependent manner. Low concentrations of SNP (pmoles of NO) increased cellulose content in roots while higher concentrations of SNP (nmoles of NO) had the opposite effect. This result correlated with assays of 14C-glucose incorporation into cellulose in roots. The effect of NO on 14C-glucose incorporation into cellulose was transient and reversible. Microscopic analysis of roots suggested that NO affected primary cell wall cellulose synthesis. Three tomato cellulose synthase (SlCESA) transcripts were identified. Reverse transcriptase polymerase chain reaction experiments were carried out and indicated that SlCESA1 and SlCESA3 levels were affected by high NO concentrations. Together, these results support the hypothesis that variations in NO levels influence cellulose synthesis and content in roots.