title: Effects of delta-aminolevulinic acid on pigment formation and chlorophyllase activity in French bean leaf.
abstract: Chloroplast development and chlorophyll biosynthesis are co-regulated. Treatment by levulinic acid resulted in a linear relation in both chlorophyll and carotenoid contents, during greening of etiolated French bean leaf discs. Chlorophyll biosynthesis appeared to control that of caroteins. In the presence of levulinic acid; at different levels, photosystem II (PS II) activity decreased when expressed on a chlorophyll basis. Chlorophyllase activity was increased progressively by increasing levulinic acid concentration. Thus, levulinic acid could be used to arrest the light-induced chloroplast development at a desired phase of greening and acts as determinator of chloroplast development in green tissues.
authors.affiliation: Department of Botany, Faculty of Science, Mansoura University, El-Mansoura, Egypt.
authors.forename: H M
authors.initials: HM
authors.lastname: El-Saht
mesh_terms: D000622:Aminolevulinic Acid / Q000494:pharmacology*; D002265:Carboxylic Ester Hydrolases / Q000096:biosynthesis*; D002338:Carotenoids / Q000096:biosynthesis*; D002734:Chlorophyll / Q000096:biosynthesis*; D003624:Darkness; D004579:Electron Transport; D007887:Fabaceae; D007982:Levulinic Acids / Q000494:pharmacology; D008027:Light; D010788:Photosynthesis; D010860:Pigments, Biological; D018515:Plant Leaves / Q000187:drug effects* / Q000201:enzymology / Q000528:radiation effects; D010946:Plants, Medicinal; D000623:Porphobilinogen Synthase / Q000037:antagonists & inhibitors
chemical_list: D007982:Levulinic Acids; D010860:Pigments, Biological; D002734:Chlorophyll; D002338:Carotenoids; D000622:Aminolevulinic Acid; D002265:Carboxylic Ester Hydrolases; C019875:chlorophyllase; D000623:Porphobilinogen Synthase; C032246:levulinic acid