Regulation of the Arabidopsis thaliana vitamin B6 biosynthesis genes by abiotic stress

Multiple Roles for UV RESISTANCE LOCUS8 in Regulating Gene Expression and Metabolite Accumulation in Arabidopsis under Solar Ultraviolet Radiation

“…) were higher than those from the greenhouse (450 mmol m 22 s 21 ) and may have enhanced the transcript accumulation of genes involved in vitamin B6 biosynthesis (Denslow et al, 2007;Kleine et al, 2007). Overall, analysis of PDX1 protein contents supports the gene expression data in showing that when plants receive UV-A and UV-B, UVR8 can modulate UV-A responses having a negative role on PDX1 accumulation.…”

“…There is clear evidence for the critical role of vitamin B6 and the enzyme PDX1 in conferring plant protection against abiotic stresses (Chen and Xiong, 2005;Denslow et al, 2007) and supplementary UV-B radiation (Ristilä et al, 2011). Here, a significant induction of PDX1 was observed in Arabidopsis leaves subjected to ambient solar UV-A and UV-B, indicating the importance of PDX1 for plants exposed to natural sunlight.…”

“…Pyridoxine (vitamin B6) is another essential antioxidant that may provide protection from UV-B (Ristilä et al, 2011). Two proteins are involved in vitamin B6 biosynthesis, PYRIDOXINE BIOSYNTHESIS1 (PDX1) and PDX2 (Denslow et al, 2007). It has been reported that Arabidopsis (Arabidopsis thaliana) leaves exposed to supplementary UV-B quickly accumulate PDX1 and vitamin B6 (Ristilä et al, 2011).…”

The role of the pyridoxine (vitamin B6) biosynthesis enzyme PDX1 in ultraviolet-B radiation responses in plants

“…The latter was of importance due to a controversy in the literature as to the subcellular localisation of the protein [12,17,31]. The protein levels were studied using Western blotting ( Fig.…”

Respuesta transcripcional al estrés hídrico en mandarino. Estudio genómico-funcional con micromatrices de cDNA

“…Otros ejemplos de unigenes reprimidos en hojas de plantas sometidas a estrés hídrico son: dos unigenes que codifican Flavonol sintasa (FLS1) (aCL336Contig1, AT5G08640, factor de represión 3) y Flavonol 3'-O-metiltransferasa (ATOMT1) (aCL38Contig6, AT5G54160, factor de represión 3,3), dos genes codificantes de enzimas de la ruta de síntesis de flavonoides; Geranilgeranil reductasa (aCL655Contig1, AT1G74470, factor de represión 3,3) enzima relacionada con la síntesis de fitol, compuesto que forma parte de la cadena hidrofóbica de las clorofilas y que les permite su interacción con las membranas plasmáticas y el gen de la proteína PDX1.1 (aCL409Contig1, AT2G38230, factor de represión 6,5) que forma parte del complejo glutamina aminotransferasa involucrado en la biosíntesis de vitamina B6 cuya inducción se ha detectado bajo estrés abiótico (Densiow et al, 2007).…”