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›› 2013, Vol. 49 ›› Issue (2): 46-53.doi: 10.11707/j.1001-7488.20130208

• 论文 • 上一篇    下一篇

天台鹅耳枥叶片的解剖结构和光合特性对光照的适应

陈模舜, 柯世省   

  1. 台州学院生命科学学院 临海 317000
  • 收稿日期:2012-03-08 修回日期:2012-12-21 出版日期:2013-02-25 发布日期:2013-02-25

Acclimation of Anatomical Structure and Photosynthesis Characteristics in Leaves of Carpinus tientaiensis to Irradiance

Chen Moshun, Ke Shisheng   

  1. School of Life Science, Taizhou University Linhai 317000
  • Received:2012-03-08 Revised:2012-12-21 Online:2013-02-25 Published:2013-02-25

摘要: 研究天台鹅耳枥幼树叶片的解剖结构和光合特性对不同模拟生长环境光强(全光照FI、中等光强MI和低光强LI)的响应。结果表明: 与MI和LI叶片相比,天台鹅耳枥FI叶片最厚,比叶质量(LMA)、叶绿素a/b、最大净光合速率(Pmax)、暗呼吸速率(Rd)、羧化效率(CE)和单位叶面积氮含量(Narea)较高。FI叶片叶绿体在叶肉细胞表面排列紧密,MI叶片叶绿体在叶肉细胞质中随机分布,LI叶片叶绿体在叶肉细胞表面分布较为稀疏,使得细胞表面产生了大量剩余空间。FI叶片叶肉组织加厚增大了叶肉细胞间隙面的表面积(Smes)和叶绿体在叶肉细胞表面分布的有效空间,使得紧邻叶肉细胞间隙面的叶绿体表面积(Sc)增大,所以FI叶片的Pmax较高。FI叶片叶绿素荧光参数Fv/Fm,Fv/Fo的值较高,表明强光下其光能转换效率仍较高。因此,在全光照条件下天台鹅耳枥能改变其叶片解剖结构增强光合能力,适宜在光线较强的林窗环境中生长。

关键词: 天台鹅耳枥, 光照, 叶片解剖结构, 叶绿体表面积, 光合特性

Abstract: The responses of anatomical structure and photosynthesis characteristics of Carpinus tientaiensis seedlings to three simulative irradiance regimes (viz. full irradiance, FI, moderate irradiance, MI, and low irradiance, LI) were examined in this present study. The results showed that plants under FI exhibited the thickest leaves with the significant greater leaf mass per area (LMA), greater chlorophyll a/b ratio, maximal net photosynthetic rate (Pmax), respiration rate (Rd), carboxylation efficiency (CE), and higher nitrogen content per unit leaf area (Narea), among the three irradiance regimes. The chloroplasts of FI leaves were tightly packed in the mesophyll cells and had no spaces along the mesophyll cell walls, the chloroplasts in MI leaves were randomly dispersed throughout the cytoplasm of mesophyll cells, and the chloroplasts of LI leaves had a relatively sparse distribution along the mesophyll cell wall, and left the wide open spaces. The thickened mesophyll in FI leaves increased the availability of space along the mesophyll cell wall for chloroplasts and the surface area of both mesophyll cells (Smes) and chloroplasts (Sc) facing intercellular space, and there thus was higher Pmax. The higher capacity of photosynthetic quantum conversion in FI leaves was also evidenced by the higher values of the chlorophyll fluorescence parameters of Fv/Fm and Fv/Fo. Thus, C. tientaiensis can acclimate to full sunlight by altering leaf anatomy and hence increase the photosynthetic capacity, as a result it can grow under the high light intensity such as forest gaps.

Key words: Carpinus tientaiensis, irradiance, leaf anatomical structure, surface area of chloroplasts facing intercellular space, photosynthesis characteristics

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