Hydrothermal sensitivities of seed populations underlie fluctuations of dormancy states in an annual plant community

doi:10.1002/ecy.2958

	Hydrothermal sensitivities of seed populations underlie fluctuations of dormancy states in an annual plant community
	Liu, Shuangshuang ; Bradford, Kent J.; Huang, Zhen-Ying; Venable, D. Lawrence
	2020
发表期刊	ECOLOGY
ISSN	0012-9658
卷号	101 期号:3
摘要	Plant germination ecology involves continuous interactions between changing environmental conditions and the sensitivity of seed populations to respond to those conditions at a given time. Ecologically meaningful parameters characterizing germination capacity (or dormancy) are needed to advance our understanding of the evolution of germination strategies within plant communities. The germination traits commonly examined (e.g., maximum germination percentage under optimal conditions) may not adequately reflect the critical ecological differences in germination behavior across species, communities, and seasons. In particular, most seeds exhibit primary dormancy at dispersal that is alleviated by exposure to dry after-ripening or to hydrated chilling to enable germination in a subsequent favorable season. Population-based threshold (PBT) models of seed germination enable quantification of patterns of germination timing using parameters based on mechanistic assumptions about the underlying germination physiology. We applied the hydrothermal time (HTT) model, a type of PBT model that integrates environmental temperature and water availability, to study germination physiology in a guild of coexisting desert annual species whose seeds were after-ripened by dry storage under different conditions. We show that HTT assumptions are valid for describing germination physiology in these species, including loss of dormancy during after-ripening. Key HTT parameters, the hydrothermal time constant (theta(HT)) and base water potential distribution among seeds (psi(b)(g)), were effective in describing changes in dormancy states and in clustering species exhibiting similar germination syndromes. theta(HT) is an inherent species-specific trait relating to timing of germination that correlates well with long-term field germination fraction, while psi(b)(g) shifts with depth of dormancy in response to after-ripening and seasonal environmental variation. Predictions based on variation among coexisting species in theta(HT) and psi(b)(g) in laboratory germination tests matched well with 25-yr observations of germination dates and fractions for the same species in natural field conditions. Seed dormancy and germination strategies, which are significant contributors to long-term species demographics under natural conditions, can be represented by readily measurable functional traits underlying variation in germination phenologies.
关键词	after-ripening dormancy germination niche germination phenology hydrothermal time model plant functional trait
学科领域	Ecology
DOI	10.1002/ecy.2958
收录类别	SCI
语种	英语
WOS关键词	THRESHOLD MODELS ; LIFE-HISTORY ; TIME MODEL ; BROMUS-TECTORUM ; GERMINATION RESPONSE ; TEMPERATURE ; ECOLOGY ; CONTEMPORARY ; REPRODUCTION ; POTENTIALS
WOS研究方向	Environmental Sciences & Ecology
WOS记录号	WOS:000508802100001
出版者	WILEY
文献子类	Article
出版地	HOBOKEN
EISSN	1939-9170
资助机构	National Evolutionary Synthesis Center, National Science Foundation (NSF)National Science Foundation (NSF) [EF-0905606] ; NSFNational Science Foundation (NSF) [DEB-9107324, DEB-9419905, DEB-0212782, DEB 0453781, DEB-0817121, DEB-0844780, DEB-1256792] ; State Scholarship Fund of the China Scholarship Council (CSC) ; Department of Plant Sciences, UC Davis ; United States Department of Agriculture Cooperative States Research, Education and Extension Service Regional Research Project [W3168]
作者邮箱	zhenying@ibcas.ac.cn
引用统计	被引频次：24[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/21943
专题	植被与环境变化国家重点实验室
作者单位	1.Fudan Univ, Inst Biodivers Sci, Key Lab Biodivers Sci & Ecol Engn, Minist Educ, Shanghai 200438, Peoples R China 2.Liu, Shuangshuang; Bradford, Kent J.] Univ Calif Davis, Dept Plant Sci, Seed Biotechnol Ctr, Davis, CA 95616 USA 3.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 4.Univ Arizona, Dept Ecol & Evolutionary Biol, Tucson, AZ 85721 USA
推荐引用方式 GB/T 7714	Liu, Shuangshuang,Bradford, Kent J.,Huang, Zhen-Ying,et al. Hydrothermal sensitivities of seed populations underlie fluctuations of dormancy states in an annual plant community[J]. ECOLOGY,2020,101(3).
APA	Liu, Shuangshuang,Bradford, Kent J.,Huang, Zhen-Ying,&Venable, D. Lawrence.(2020).Hydrothermal sensitivities of seed populations underlie fluctuations of dormancy states in an annual plant community.ECOLOGY,101(3).
MLA	Liu, Shuangshuang,et al."Hydrothermal sensitivities of seed populations underlie fluctuations of dormancy states in an annual plant community".ECOLOGY 101.3(2020).

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