[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.
Li
Yan
Y
Fujian Agricultural and Forestry University, Fuzhou 350002. liyan1@pub3.fz.fj.cn
Liu
Xinghui
X
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