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JIANG Hao, HUANG Yu-Hui, ZHOU Guo-Yi, HU Xiao-Ying, LIU Shi-Zhong, TANG Xu-Li. Acclimation in Leaf Morphological and Eco-physiological Characteristics of Different Canopy-dwelling Epiphytes in a Lower Subtropical Evergreen Broad-leaved Forest[J]. Plant Science Journal, 2012, (3): 250-260. DOI: 10.3724/SP.J.1142.2012.30250
Citation: JIANG Hao, HUANG Yu-Hui, ZHOU Guo-Yi, HU Xiao-Ying, LIU Shi-Zhong, TANG Xu-Li. Acclimation in Leaf Morphological and Eco-physiological Characteristics of Different Canopy-dwelling Epiphytes in a Lower Subtropical Evergreen Broad-leaved Forest[J]. Plant Science Journal, 2012, (3): 250-260. DOI: 10.3724/SP.J.1142.2012.30250
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Acclimation in Leaf Morphological and Eco-physiological Characteristics of Different Canopy-dwelling Epiphytes in a Lower Subtropical Evergreen Broad-leaved Forest

  • 1.

    South China Botanical Garden, Chinese Academy of Science, Guangzhou 510650, China

  • 2. Graduate University of Chinese Academy of Science, Beijing 100049, China

  • 3. Guangdong Academy of Forestry, Guangzhou 510520, China

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  • Received Date: November 28, 2011
  • Revised Date: January 03, 2012
  • Published Date: June 29, 2012
    Graphical Abstract
    • Abstract
  • Epiphytes have been well characterized in terms of the morphological and eco-physiological traits that permit them to thrive in the complex forest canopy.Our aim was to characterize and analyze the morphological and eco-physiological traits of different canopy-dwelling epiphytes in a lower subtropical evergreen broad-leaved forest in Southern China.Results showed that the differences in morphological and eco-physiological characteristics between the upper and lower canopy-dwelling epiphytes were largely explained by changes in environmental factors such as photosynthetic active radiation (PAR),temperature,and humidity within the complex forest canopy.Two epiphytes,Dischidia chinensis and Psychotria serpens located in the upper canopy had low Tr (0.17±0.02 mmol H2O and 0.34±0.05 mmol H2O,respectively) and low Pmax (2.2±0.1 μmol CO2·m-2·s-1 and 3.2±0.4 μmol CO2·m-2·s-1,respectively) associated with thick leaf (558±63 μm and 217.1±33.1 μm,respectively) and small stomata size (185.7±3.7 μm2 and 225.4±5.2 μm2,respectively) to adapt to their upper dwelling environments (high temperature,low air humidity and high PAR).At the same time,the special structures led to high WUE (11.35±0.87 μmol CO2/mmol H2O and 7.88±1.31 μmol CO2/mmol H2O,respectively).However,the lower canopy-dwelling epiphytes Fissistigma glaucescens and Piper hancei had thin leaf (90.8±9.9 μm and 114.9±18.2 μm,respectively) and large stomata size (260.6±6.3 μm2 and 362.5±8.7 μm2,respectively).The ratios of palisade to spongy tissues thickness (P/S),the thickness of leaf epidermis thickness and other structures also changed with various canopy-dwelling heights.In comparison with Dischidia chinensis and Psychotria serpens located at upper canopy-dwelling conditions, Fissistigma glaucescens and Piper hancei showed high Pmax (9.5±1.3 μmol CO2·m-2·s-1 and 7.1±0.8 μmol CO2·m-2·s-1,respectively),high Tr (0.67±0.10 mmol H2O and 0.74±0.13 mmol H2O,respectively),and low WUE (4.4±1.0 μmol CO2/mmol H2O and 3.4±0.9 μmol CO2/mmol H2O,respectively),which was 1.2-3.3 times (Pmax), 1.2-2.3 times (Tr),and 30%-48% higher (WUE).
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