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Physiological response of moss/cyanobacteria crusts along a precipitation gradient from semi-arid to arid desert in China

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Abstract

Aims

Desert regions are regarded as highly sensitive to climatic changes. In arid and semi-arid desert, photosynthetic organisms from biological soil crusts are poikilohydric and sensitive to fluctuations in precipitation. How do physiological properties such as concentration of biochemical constituents and enzymes respond to a precipitation gradient from semi-arid to arid desert regions?

Methods

We sampled cyanobacteria and moss crusts from four desert regions with distinctly different amounts of annual rainfall. Subsequently, the contents of photosynthetic pigments, malondialdehyde (MDA), osmotic adjustment substances, and antioxidative enzyme activities were correlated with the means of annual precipitation, evaporation, and temperature at the various sites.

Results

Crust type, precipitation level, and their interaction had significant influences on many physiological properties (photosynthetic pigments, proline, soluble sugar, and superoxide dismutase). The contents of soluble protein, proline, and soluble sugar of cyanobacteria/moss crusts decreased with increasing precipitation level. Superoxide dismutase and catalase activities of cyanobacteria crusts decreased significantly with increasing annual precipitation. No significant variations in MDA were observed between different precipitation regions in the two crusts.

Conclusions

Among the environmental variables tested, the annual amount of precipitation had the strongest effect on the physiological properties of moss/cyanobacteria crusts in different regions. Crust type combined with particular precipitation level influenced the physiological properties of crusts. Moreover, both moss and cyanobacteria crusts exhibited strong physiological adaptability to changes in precipitation. This result needs to be incorporated into future ecological models, which will help in understanding the function and vulnerability of biocrusts in the face of climate change.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

BSCs:

Biological soil crusts

Chl:

Chlorophyll

Car:

Carotenoid

MDA:

Malondialdehyde

PVP:

Polyvinylpyrrolidone

SOD:

Superoxide dismutase

CAT:

Catalase

SD:

Standard deviation

ANOVA:

Analysis of variance

MAP:

Mean annual precipitation

MAT:

Mean annual temperature

MAE:

Mean annual evaporation

References

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Acknowledgements

The research was jointly supported by the National Key Research and Development Program of China (2018YFC0406603) and the National Natural Science Foundation of China (Nos. 41621001, 32061123006, and 41701104).

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Authors and Affiliations

Authors

Contributions

All authors contributed to the study. Investigation, sample collection and measurement, data collection and analysis were performed by RH, HT, and RJ. XL and RZ carried out the manuscript revision. The first draft of the manuscript was written by RH and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Rong Hui.

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Conflict of interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Responsible Editor: Manuel Delgado-Baquerizo.

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Hui, R., Li, X., Zhao, R. et al. Physiological response of moss/cyanobacteria crusts along a precipitation gradient from semi-arid to arid desert in China. Plant Soil 468, 97–113 (2021). https://doi.org/10.1007/s11104-021-05117-2

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  • DOI: https://doi.org/10.1007/s11104-021-05117-2

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