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Seasonal progression of photoprotection responses in different aged savin juniper plants under shade and sun

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Abstract

Key message

In savin juniper, age and season can affect photosynthesis, chlorophyll fluorescence and photoprotective pigments. In spring, 2-year-old plants had more lutein than 5-year-olds, but the reverse occurred during summer and autumn.

Abstract

Savin juniper is an endemic evergreen shrub in the Mu Us Desert, where it establishes only with the protection of larger plants. Ultimately, established plants emerge into full sunlight as they grow. To explore how photoprotection responses change during this transition, a pot study was established under field conditions with three sunlight regimes (10%, 50% and 100% light transmittance) and two age cohorts (1- and 4-year-old rooted scions). To avoid potentially confounding effects of differences in leaf form, after one year we measured photosynthesis, chlorophyll fluorescence and foliar pigments of 2- and 5-year-old savin juniper on a monthly basis from April to October. For gas exchange and fluorescence variables, there were no interactions between cohort and sunlight except for intrinsic water-use efficiency in June; however, there were many interactions regarding pigment concentrations and ratios. Generally, 5-year-old plants had higher mean chlorophyll, total carotenoids, and chlorophyll a/b ratios than 2-year-old plants, but lower mean β-carotene/α-carotene ratio, zeaxanthin and lutein. Plants under brighter light had lower mean lutein. There were obvious changes in β-carotene/α-carotene, zeaxanthin and lutein in June, July and August, respectively. Under 100% sunlight, lutein concentration was higher in 2-year-old than 5-year-old plants from April to June, but this pattern reversed from July to October. The effects of age and season, in addition to the prevailing light regime, need to be considered when investigating the role of carotenoids in photoprotection.

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The data of this manuscript are included as electronic supplementary material.

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Acknowledgements

We thank Ai-Hua Yan, Bing-Xiang Liu, Ke-Jiu Du, Hong-Bo Cao and Min-Sheng Yang for laboratory and technical assistance; and Feng Mu, Xin Lin, An-Ning Wang, Da Cheng, Ge-Chang Liu and Zi-Min Cheng for experiment assistance.

Funding

This research was supported by the Natural Science Foundation of Hebei Province (C2011204096), the Doctoral Student Innovation Capability Promotion Project of Hebei Agricultural University, China Scholarship Council and the Key Laboratory of Forest Tree Germplasm Resources and Forest Conservation of Hebei Province.

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JLZ and YLL designed the study. JLZ, XGL, XHX and HPC conducted the field and laboratory research. JLZ and HPC organized and analyzed the data. JLZ, YLL and RDG interpreted the data and wrote the manuscript. All authors provided intellectual input and edited/approved the manuscript.

Corresponding authors

Correspondence to Yu-Ling Li or Robert D. Guy.

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The authors declare that they have no conflict of interest.

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The work described was original research that has not been published previously, and is not under consideration for publication elsewhere, in whole or in part.

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The manuscript has been approved by all authors (Jin-Ling Zhang, Xiao-Gang Li, Xue-Hua Xu, Hai-Peng Chen, Yu-Ling Li and Robert D. Guy) for publication.

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Communicated by Fernandez-Marin.

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Zhang, JL., Li, XG., Xu, XH. et al. Seasonal progression of photoprotection responses in different aged savin juniper plants under shade and sun. Trees 35, 1601–1612 (2021). https://doi.org/10.1007/s00468-021-02139-2

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  • DOI: https://doi.org/10.1007/s00468-021-02139-2

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