| 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 |
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| 引用本文： | 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,2004,15(6):935-940. |
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| 作者姓名： | 吴楚 范志强 王政权 |
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| 作者单位： | 1. 东北林业大学森林资源与环境学院,哈尔滨,150040;长江大学园艺园林学院,荆州,434125
2. 东北林业大学森林资源与环境学院,哈尔滨,150040 |
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| 基金项目： | 国家自然科学基金重点项目 ( 3 0 13 0 160 )，国家“十五”科技攻关资助项目 ( 2 0 0BA5 15B0 5 ) |
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| 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(Fv／Fm)、PSⅡ的光化学效率(ΦpsⅡ)、电子传递速率(ETR)以及最大光合速率(Amax)下降．磷胁迫对叶绿素合成的影响与Amax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．
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| 关 键 词： | 土壤污染 土壤微生物 宏蛋白质组学 土壤蛋白质提取方法 |
| 文章编号： | 1001-9332(2004)06-0935-06 |
| 修稿时间： | 2003年4月7日 |
Effect of phosphorus stress on chlorophyll biosynthesis,photosynthesis and biomass partitioning pattern of Fraxinus mandchurica seedlings |
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| 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,2004,15(6):935-940. |
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| Authors: | WU Chu FAN Zhiqiang WANG Zhengquan |
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| Affiliation: | School of Forest Resources and Environment, Northeast Forestry University, Harbin 150040, China. wuchuchu2001@yahoo.com |
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| 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 PS II (Fv/Fm) efficiency of PS II photochemistry (phi(PS II)), electron transport rate (E(TR)), and maximum photosynthesis rate (Amax). 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. |
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| Keywords: | Fraxinus mandchurica Phosphorus stress Chlorophyll biosynthesis Photosynthesis Biomass partitioning |
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