Hydrothermal sensitivities of seed populations underlie fluctuations of dormancy states in an annual plant community
文献类型：期刊论文
| 作者 | Liu, Shuangshuang; Bradford, Kent J.; Huang, Zhen-Ying ; Venable, D. Lawrence
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| 刊名 | ECOLOGY
 |
| 出版日期 | 2020 |
| 卷号 | 101期号:3 |
| 关键词 | after-ripening dormancy germination niche germination phenology hydrothermal time model plant functional trait |
| ISSN号 | 0012-9658 |
| DOI | 10.1002/ecy.2958 |
| 文献子类 | Article |
| 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. |
| 学科主题 | Ecology |
| 出版地 | HOBOKEN |
| 电子版国际标准刊号 | 1939-9170 |
| 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 |
| 语种 | 英语 |
| WOS记录号 | WOS:000508802100001 |
| 出版者 | WILEY |
| 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] |
| 源URL | [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.Liu, Shuangshuang; Bradford, Kent J.] Univ Calif Davis, Dept Plant Sci, Seed Biotechnol Ctr, Davis, CA 95616 USA 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 3.Univ Arizona, Dept Ecol & Evolutionary Biol, Tucson, AZ 85721 USA 4.Fudan Univ, Inst Biodivers Sci, Key Lab Biodivers Sci & Ecol Engn, Minist Educ, Shanghai 200438, Peoples R China |
| 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). |
入库方式： OAI收割
来源：植物研究所
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