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Biogeosciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/bg-2017-368
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
11 Sep 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Biogeosciences (BG).
Effects of storage temperature on physiological characteristics and vegetative propagation of desiccation-tolerant mosses
Yuewei Guo and Yunge Zhao State Key Laboratory of Soil Erosion and Dry-land Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University, Yangling, 712100, Shaanxi, China
Abstract. Mosses, as major components of later successional biological soil crusts (biocrusts), play many critical roles in arid and semi-arid ecosystems. Recently, some species of desiccation-tolerant mosses have been artificially cultured to speed up the recovery of biocrusts. Revealing the influencing factors on the vegetative propagation of mosses will benefit the restoration of moss crusts, which is an important reproductive mode of mosses in arid and semi-arid region. In this study, three desiccation-tolerant mosses (Barbula unguiculata, Didymodon vinealis and Didymodon tectorum) were stored at five temperature gradients (0 °C, 4 °C, 17 °C, 25 °C and 30 °C) for 40 days. Then vegetative propagation and physiological characteristics of the three mosses were investigated to determine the influence of storage temperature on vegetative propagation of desiccation-tolerant mosses and its mechanism. The results showed that vegetative propagation of the three mosses varied with temperature, and the most significant change was observed in D. tectorum after storage at different temperatures. Conversely, no significant difference was found in D. vinealis. Only germination percentage of B. unguiculata was not significantly different at all storage temperatures. The enhancement in regenerative capacity of the three mosses was accompanied by an increased temperature from 0 °C to 17 °C and a decrease beyond that. Malondialdehyde (MDA) content of the three mosses was increased by more than 50 % at all of the investigated temperatures, meanwhile, soluble sugar content increased in the three mosses. However, a decrease trend was observed in MDA content from 0 to 17 °C. As the temperature increased, the contents of chlorophyll and soluble protein in B. unguiculata increased, while decreased in D. vinealis and D. tectorum. The integrity of cell and its membrane probably is the important influencing factor on the vegetative propagation of desiccation-tolerant mosses. Although a 40-day storage period caused cell injury, our results suggested that storage temperature could enhance or suppress such injury and change vegetative propagation capacity of the three mosses. It could be concluded that the suitable storage temperature of B. unguiculata was 4 °C and the optimal temperature was 17 °C for D. vinealis and D. tectorum.

Citation: Guo, Y. and Zhao, Y.: Effects of storage temperature on physiological characteristics and vegetative propagation of desiccation-tolerant mosses, Biogeosciences Discuss., https://doi.org/10.5194/bg-2017-368, in review, 2017.
Yuewei Guo and Yunge Zhao
Yuewei Guo and Yunge Zhao
Yuewei Guo and Yunge Zhao

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Short summary
This study is a preparatory work for inoculating artificial biological soil crusts (biocrusts). Response of physiological characteristics and regenerative capacity of three mosses to storage temperatures were studied. The results showed different temperature significantly influenced physiological characteristics of the mosses, which caused obvious alteration in their regenerative capacity. Hence, we should pay more attention to the statues of moss inocula when restoring biocrusts by inoculation.
This study is a preparatory work for inoculating artificial biological soil crusts (biocrusts)....
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