[Effects of magnesium deficiency on senescence of Dimocarpus longana leaves].
180 days old Dimocarpus longana seedlings were grown in nutrition solution with three magnesium concentrations as 4 mmol.L-1 Mg2+ (sufficient supply), 0.4 mmol.L-1 Mg2+ (deficient supply), and Mg-free (without supply). Leaves were sampled 120 and 150 days later after treatment. With an increase in severity of Mg-deficient, the chlorophyll content, PS II activities, photosynthetic rate, protein, nucleic acid (DNA, RNA), and ZRs contents declined progressively. Whereas the content of H2O2, the rate of O2-. generation as well as the content of malondialdehyde (MDA) increased. The results suggested that magnesium deficiency had significant effect on the senescence of Dimocarpus longana leaves.
Fujian Agricultural and Forestry University, Fuzhou 350002. liyan1@pub3.fz.fj.cn
Yan
Y
Li
Xinghui
X
Liu
D000375:Aging / Q000378:metabolism* / Q000502:physiology; D002734:Chlorophyll / Q000378:metabolism; D015536:Down-Regulation / Q000502:physiology; D006861:Hydrogen Peroxide / Q000378:metabolism; D045342:Light-Harvesting Protein Complexes; D008275:Magnesium Deficiency / Q000378:metabolism*; D008315:Malondialdehyde / Q000378:metabolism; D045322:Photosynthetic Reaction Center Complex Proteins / Q000378:metabolism; D010937:Plant Growth Regulators / Q000378:metabolism; D018515:Plant Leaves / Q000378:metabolism*; D017382:Reactive Oxygen Species / Q000378:metabolism; D029631:Sapindaceae / Q000378:metabolism* / Q000502:physiology; D015854:Up-Regulation
D045342:Light-Harvesting Protein Complexes; D045322:Photosynthetic Reaction Center Complex Proteins; D010937:Plant Growth Regulators; D017382:Reactive Oxygen Species; D002734:Chlorophyll; D008315:Malondialdehyde; D006861:Hydrogen Peroxide