Photosynthetic independence of initial light-caused increase in extractable nitrate reductase activity from maize seedlings

スポンサーリンク

概要

• 論文の詳細を見る

• Comparisons of the effects of light on extractable nitrate reductase (EC 1.6.6.1) activity in Zea mays L. seedlings with and without normally developing photosynthetic systems were made. Generally, plants lacking chlorophyll, due to either chemical treatment (fluridone) or genetic lesion (a chlorophyll and a carotenoid mutant), had as high or higher nitrate reductase (NR) activities as normally greening plants during the first 12 to 24 hr of continuous white light (W) induction. This trend was especially pronounced in mesocotyl tissues. In apical tissues (including leaf, coleoptile and apical meristem) NR activity continued to increase in normally greening plants between 24 and 48 hr while activities of achlorophyllous plants decreased markedly. These decreases could not be explained by a toxic accumulation of nitrite. Continuous far-red light (FR), which causes pronounced photomorphogenic development without significant greening, induced about one-half as much NR in the mesocotyls as did continuous white light. In apical tissues the effects of W and FR were similar throughout a 72 hr time course. Although trends were similar, the effects of light (W and FR) on nitrate concentration were kinetically different from effects on NR activity. These results indicate that photosynthetic pigments are only secondarily involved in NR induction.

• 日本植物生理学会の論文

著者

• Duke Stephen

  Usda Sea Ar Southern Weed Science Laboratory

• DUKE Stephen

  USDA, ARS, Natural Products Utilization Research Unit

• Duke Stanley

  Departmcnt Of Agronomy University Of Wisconsin

関連論文

• Rhythmic Oscillations in Starch Concentration and Activities of Amylolytic Enzymes and Invertase in Medicago sativa Nodules
• A Survey of Synthetic and Natural Phytotoxic Compounds and Phytoalexins as Potential Antimalarial Compounds(Pharmacology)
• Subcellular Localization of Enzymes of Carbon and Nitrogen Metabolism in Nodules of Medicago sativa
• Apoplastic a-Amylase in Pea is Enhanced by Heat Stress
• Photosynthetic independence of initial light-caused increase in extractable nitrate reductase activity from maize seedlings
• The effect of nitrogen addition on N_2-fixation and on glutamate dehydrogenase and glutamate synthase activities in nodules and roots of soybeans inoculated with various strains of Rhizobium japonicum
• In vitro nitrate reductase activity and in vivo phytochrome measurements of maize seedlings as affected by various light treatments

スポンサーリンク