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Trees

, Volume 29, Issue 4, pp 1011–1022 | Cite as

Growth, photosynthetic and physiological responses of Torreya grandis seedlings to varied light environments

  • Hui Tang
  • Yuan-Yuan Hu
  • Wei-Wu Yu
  • Li-Li Song
  • Jia-Sheng WuEmail author
Original Paper
Part of the following topical collections:
  1. Light Stress

Abstract

Key message

Shading could improve plant growth in Torreya grandis seedling, and 75 % shade is likely the optimum light irradiance level for its growth.

Abstract

Light is a critical factor that affects the survival and early growth of tree seedlings. Torreya grandis, an economically important subtropical plant, is a shade-preferring species; however, the optimum light intensity for the growth of this species was still unclear. To determine the optimum light intensity, we examined the growth, chlorophyll fluorescence, gas exchange, and chloroplast ultrastructure of T. grandis seedlings growing under four levels of shade (i.e., 0, 50, 75, and 90 %). The results showed that T. grandis attained the greatest Pn and biomass when cultivated with 75 % shade. Seedlings grown under 75 % shade exhibited a 155 % increase in the height increment, a 440 % increase in the diameter increment, a 42.2 % increase in biomass, and a 102 % increase in the photosynthetic rate compared with seedlings grown in full sun. Moreover, 75 % shaded plants had the lowest antioxidant enzyme activities, malondialdehyde content and ion leakage. Full sunlight and 50 % shade significantly reduced the growth of T. grandis which was associated with a decrease in the maximal photochemical efficiency, photosynthetic rate, chlorophyll content and biomass compared with those under 75 % shade. Compared with the 75 % shaded plants, seedlings grown under 90 % shade had a reduced photosynthetic rate, which was accompanied by increased malondialdehyde content, relative electrolyte conductivity and antioxidant enzymes activities, suggesting that seedlings under the 90 % shade had the lower energy utilizing capacity. Higher antioxidant enzyme activities might be an efficient adaptation to protection against oxidative stress under low light conditions. Therefore, our results indicate that 75 % shade is likely the optimum light irradiance level for T. grandis seedling growth.

Keywords

Growth Chlorophyll fluorescence Photosynthesis Chloroplast ultrastructure Torreya grandis 

Notes

Author contribution statement

Designing the work: J.S.W.; running the experiments: H.T., Y.-Y. Hu., W.-W. Yu., L.-L.S.; data analysis and statistics: H.T. and Y.-Y. Hu; article writing and revising: H.T., Y.-Y. Hu., W.-W. Yu., L.-L.S., J.-S.W.

Acknowledgments

This work was funded by the Fruit Innovation Team Project of Zhejiang Province (2009R50033-7), the Zhejiang Provincial Natural Science Foundation of China (LZ12C16001), the Major Project of National Spark Plan of China (2012GA700001), the Launching Funds for Zhejiang A&F University (2013FR063), and the open project funds for forestry discipline in Zhejiang province (KF201312).

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Hui Tang
    • 1
    • 2
  • Yuan-Yuan Hu
    • 1
    • 2
  • Wei-Wu Yu
    • 1
    • 2
  • Li-Li Song
    • 1
    • 2
  • Jia-Sheng Wu
    • 1
    • 2
    Email author
  1. 1.Nurturing Station for the State Key Laboratory of Subtropical SilvicultureZhejiang A & F UniversityLin’an, HangzhouPeople’s Republic of China
  2. 2.School of Forestry and BiotechnologyZhejiang A & F UniversityLin’an, HangzhouPeople’s Republic of China

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