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Compensatory growth and photosynthetic responses of Pharbitis purpurea seedlings to clipped cotyledon and second leaf

  • Original Papers
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Photosynthetica

Abstract

Leaf tissue damaging to seedlings can limit their subsequent growth, and the effects may be more extensive. Compensatory photosynthesis responses of the remnant cotyledon and primary leaf of Pharbitis purpurea to clipping and the effect of clipping on seedling growth were evaluated in a pot-cultivated experiment. Three treatments were conducted in the experiment, which were clipped cotyledon (CC), clipped second leaf (CL), and control group (CG). The area, thickness, mass, and longevity of the remaining cotyledon of CC exhibited over-compensatory growth. In contrast, seedlings of CC had under-compensatory growth in seedling height, root length, seedling mass, and root to shoot ratio. However, the traits of remnant cotyledon and seedling in CL treatment exhibited equal-compensatory growth. Net photosynthetic rate of the cotyledon of CC was significantly higher than those of CL and CG treatments, and the diurnal changes in photosynthetic rates showed significantly different patterns which were unimodal curve (CC) and bimodal curve (CL and CG), respectively. There was no significant difference between CL and CG treatment. Net photosynthetic rate of the primary leaf of CL was significantly higher than that of CG treatment. However, the photosynthetic rates of primary leaves of CL and CG treatments showed similar photosynthetic patterns characterized by a bimodal curve. P. purpurea seedlings used a compensatory growth strategy in the remaining cotyledon or the primary leaf to resist leaf loss and minimize any adverse effects.

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Abbreviations

CC:

clipped cotyledon

CL:

clipped second leaf

CG:

control group

Ci/Ca:

intercellular CO2/ambient CO2

E :

transpiration rate

g s :

stomatal conductance

P N :

net photosynthetic rate

RH:

relative humidity in the chamber

R/S:

root/shoot ratio

Tair :

temperature in the chamber

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Acknowledgements

This study is funded by the National Key Basic Research Program (2007CB106801).

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Authors and Affiliations

  1. Institute of Grassland Science, Northeast Normal University, Changchun, 130024, China

    W. Zheng, J. Y. Yang & Z. H. Luan

  2. Key Laboratory of Vegetation Ecology, Ministry of Education, Northeast Normal University, Changchun, 130024, China

    W. Zheng, J. Y. Yang & Z. H. Luan

  3. State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, College of Urban and Environmental Science, Northeast Normal University, Changchun, 130024, China

    P. Wang

  4. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130012, China

    H. X. Zhang & D. W. Zhou

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  1. W. Zheng
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Correspondence to D. W. Zhou.

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Zheng, W., Yang, J.Y., Luan, Z.H. et al. Compensatory growth and photosynthetic responses of Pharbitis purpurea seedlings to clipped cotyledon and second leaf. Photosynthetica 49, 21–28 (2011). https://doi.org/10.1007/s11099-011-0004-4

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  • DOI: https://doi.org/10.1007/s11099-011-0004-4

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