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Effect of temperature and moist conditions on seed dormancy cycling of two sympatric limestone species, Begonia guishanensis and Paraisometrum mileense, in southern China

Published online by Cambridge University Press:  14 April 2020

Xiao-Jian Hu Open the ORCID record for Xiao-Jian Hu [Opens in a new window] ,
Cheng Liu ,
Ai-Rong Li ,
Xiang-Yun Yang  and
Carol Baskin
Xiao-Jian Hu
Affiliation:
The Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan650201, China
Cheng Liu
Affiliation:
The Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan650201, China
Ai-Rong Li
Affiliation:
Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming650201, China
Xiang-Yun Yang*
Affiliation:
The Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan650201, China
Carol Baskin
Affiliation:
Department of Biology, University of Kentucky, Lexington, KY40546, USA Department of Plant and Soil Sciences, University of Kentucky, Lexington, KY40546, USA
*
Author for correspondence: Xiang-Yun Yang, E-mail: yxy@mail.kib.ac.cn
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Abstract

Information about seed dormancy cycling and germination in relation to temperature and moisture conditions in the natural environment is important for the conservation and restoration of rare species, including Begonia guishanensis and Paraisometrum mileense, two sympatric perennial limestone (karst) species. Dry afterripening (DAR) and wet and dry (WD) cycles at 15/5 and 25/15°C as well as moist chilling (MC) at 15/5°C were used to mimic the natural environment at different times of the year. A field experiment was conducted to monitor seasonal changes in germination responses of the seeds. About 40–65% of B. guishanensis and 5% of P. mileense seeds were dormant at maturity. DAR at 25/15 and 15/5°C as well as MC and WD cycles at 15/5°C alleviated dormancy for B. guishanensis but not P. mileense, and WD cycles at 25/15°C induced a deeper conditional dormancy for both species. Seeds of B. guishanensis exhibited dormancy cycling in the field, with increased dormancy under natural WD cycles at relatively high temperatures during the transition from the dry to the wet season in April to May and decreased dormancy during the wet season from June to October. KNO3 mitigated the dormancy-inducing effect of both artificial and natural WD cycles at relatively high temperatures for B. guishanensis. The field experiment indicated that seeds of B. guishanensis may be able to form a persistent soil seed bank, while almost all seeds of P. mileense germinate at the beginning of the wet season in the field.

Keywords

Begonia guishanensiscold stratificationdry afterripeningendemic speciesnitrateParaisometrum mileense seed dormancy cyclingwet and dry cycles
Type
Research Paper
Information
Seed Science Research , Volume 30 , Issue 1 , March 2020 , pp. 29 - 36
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Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press

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