Stachyose Synthesis in Source Leaf Tissues of the CAM Plant Xerosicyos danguyi H. Humb. 1
AUTOR(ES)
Madore, Monica A.
RESUMO
Leaf tissues from Xerosicyos danguyi H. Humb., a succulent member of the Cucurbitaceae, were found to possess both galactinol synthase activity and the capacity for photosynthetic production of stachyose, the phloem transport oligosaccharide common to other nonsucculent cucurbits. The amounts of stachyose isolated from leaf tissues, and the extractable activity of galactinol synthase, were somewhat higher in leaf tissues obtained from plants operating in the Crassulacean acid metabolism (CAM) mode (well watered plants) compared to leaf tissues from plants operating in the CAM-idling mode (water-stressed plants). In contrast, in leaf discs, the photosynthetic incorporation of label into stachyose following pulse labeling with 14CO2 was similar for stressed and for nonstressed tissues. Stachyose could be extracted from, and was synthesized photosynthetically by, leaf discs which contained no vascular tissues, indicating that synthesis of stachyose can occur in photosynthetic mesophyll cells of Xerosicyos.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1054803Documentos Relacionados
- Morphology, leaf anatomy and phytochemical of species of Eripe Humb. &Bompl. ex Benth (Lamiacea) collected in Goias
- Morphology, leaf anatomy and phytochemical of species of Eripe Humb. &Bompl. ex Benth (Lamiacea) collected in Goias
- Fructan Content and Synthesis in Leaf Tissues of Festuca arundinacea1
- Galactosylononitol and Stachyose Synthesis in Seeds of Adzuki Bean1 : Purification and Characterization of Stachyose Synthase
- Atividade antioxidante e antimicrobiana de Calceolaria chelidonioides Humb. Bonpl. & Kunth.