干旱区生态环境知识资源中心(Arid): Hydrothermal sensitivities of seed populations underlie fluctuations of dormancy states in an annual plant community

Arid

DOI	10.1002/ecy.2958
	Hydrothermal sensitivities of seed populations underlie fluctuations of dormancy states in an annual plant community
	Liu, Shuangshuang 1,2; Bradford, Kent J.2; Huang, Zhen-Ying 3; Venable, D. Lawrence 4
通讯作者	Huang, Zhen-Ying
来源期刊	ECOLOGY
ISSN	0012-9658
EISSN	1939-9170
出版年	2020
卷号	101 期号:3
英文摘要	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.
英文关键词	after-ripening dormancy germination niche germination phenology hydrothermal time model plant functional trait
类型	Article
语种	英语
国家	Peoples R China ; USA
开放获取类型	Bronze, Green Published
收录类别	SCI-E
WOS记录号	WOS:000508802100001
WOS关键词	THRESHOLD MODELS ; LIFE-HISTORY ; TIME MODEL ; BROMUS-TECTORUM ; GERMINATION RESPONSE ; TEMPERATURE ; ECOLOGY ; CONTEMPORARY ; REPRODUCTION ; POTENTIALS
WOS类目	Ecology
WOS研究方向	Environmental Sciences & Ecology
EI主题词	2020-01-23
来源机构	中国科学院植物研究所 ; University of Arizona ; University of California, Davis
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/312588
作者单位	1.Fudan Univ, Inst Biodivers Sci, Key Lab Biodivers Sci & Ecol Engn, Minist Educ, Shanghai 200438, Peoples R China; 2.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]. 中国科学院植物研究所, University of Arizona, University of California, Davis,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).