磷胁迫对水曲柳幼苗叶绿素合成、光合作用和生物量分配格局的影响

摘要/Abstract

摘要： 采用沙培试验对水曲柳幼苗磷胁迫与叶绿素合成、光合作用和生物量分配的关系进行了研究.结果表明,在磷胁迫下,水曲柳幼苗叶片内5-氨基乙酰丙酸(ALA)合成速率和胆色素原(PBG)合成酶活性下降,但叶片中叶绿素a、叶绿素b、总叶绿素以及类胡萝卜素含量没有显著变化;水曲柳幼苗叶片和根中N浓度下降,P在各个部位的浓度也相应减少,表明N和P在苗木生理过程中具有协同作用.叶片中N浓度下降引起光系统Ⅱ(PSⅡ)最大光量子效率(F_v/F_m)、PSⅡ的光化学效率(Φ_PSⅡ)、电子传递速率(ETR)以及最大光合速率(A_max)下降.磷胁迫对叶绿素合成的影响与A_max下降无关.在磷胁迫下,水曲柳幼苗总生物量下降,且生物量分配倾向于地下部分,而在P充足或过剩条件下,生物量主要分配于地上部分.

关键词: 水曲柳, 磷胁迫, 叶绿素合成, 光合作用, 生物量分配

Abstract: Phosphorus is essential to forest trees for their growth and development,because of its important role in many metabolic processes of trees.But,most part of phosphorus in soils of Northeastern China is immobile and unavailable,and thus,many forest trees often suffer from phosphorus stress which affects the biomass accumulation of forest trees.The aim of this study is to understand how the chlorophyll biosynthesis,photosynthesis and biomass partitioning of Fraxinus mandchurica seedlings response to phosphorus stress.Sand culture experiment showed that when the seedlings were under phosphorus stress,their 5 aminolevulinic acid (ALA) biosynthesis rate and porphobilinogen (PBG) synthase activity were reduced,but no significant changes in chlorophyll a and b,total chlorophyll and carotenoid contents were found.The nitrogen content in leaves and roots and the phosphorus content in all parts of seedlings were reduced under phosphorus stress,and the reduction of N content in leaves induced the decrease of maximum quantum efficiency of PSⅡ (F_v/F_m)efficiency of PSⅡ photochemistry (Φ_PSⅡ),electron transport rate (E_TR),and maximum photosynthesis rate(A_max).The effect of phosphorus stress on chlorophyll biosynthesis didn't affect photosynthesis.Under phosphorus stress,the total biomass decreased,but more biomass was partitioned into roots.

Key words: Fraxinus mandchurica, Phosphorus stress, Chlorophyll biosynthesis, Photosynthesis, Biomass partitioning

中图分类号:

吴楚, 范志强, 王政权. 磷胁迫对水曲柳幼苗叶绿素合成、光合作用和生物量分配格局的影响[J]. 应用生态学报, 2004, (6): 935-940.

WU Chu, FAN Zhiqiang, WANG Zhengquan . Effect of phosphorus stress on chlorophyll biosynthesis,photosynthesis and biomass partitioning pattern of Fraxinus mandchurica seedlings[J]. Chinese Journal of Applied Ecology, 2004, (6): 935-940.

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