干旱区生态环境知识资源中心(Arid): Dormancy and germination of the trimorphic achenes of a cold desert annual: spreading the risk over time

Arid

DOI	10.1093/aobpla/plaa056
	Dormancy and germination of the trimorphic achenes of a cold desert annual: spreading the risk over time
	Lu, Juanjuan; Dong, Wenjing; Tan, Dunyan; Baskin, Carol C.; Baskin, Jerry M.
通讯作者	Tan, DY
来源期刊	AOB PLANTS
ISSN	2041-2851
出版年	2020
卷号	12 期号:6
英文摘要	Many studies have been done on the relationship between variation in morphology, dispersal ability and degree of dormancy of heterocarpic species with dimorphic diaspores. However, there are far fewer such studies on species that produce trimorphic diaspores. Our aim was to compare dormancy and germination of achenes from peripheral, intermediate and central positions in the capitulum of the diaspore-trimorphic cold desert annual Asteraceae species Heteracia szovitsii, an important component of plant communities in the cold deserts of NW China. Dormancy breaking/germination responses of the three achene morphs and of seeds isolated from the pericarp were tested in the laboratory using standard procedures, and seedling emergence phenology of the achene morphs was monitored under natural cold desert temperature conditions in an experimental garden with and without supplemental watering. Depth of dormancy of the three achene morphs was peripheral > intermediate > central. Seedlings from the three morphs emerged in spring and in autumn. Cumulative seedling emergence percentage from achenes during 47 months of burial was central > intermediate > peripheral. Central achene morphs emerged over a period of similar to 12 months after sowing, while intermediate and peripheral achene morphs did so for similar to 40 and 47 months, respectively. Thus, H. szovitsii exhibits a temporal dispersal strategy. No viable central or intermediate achene morphs were present after 16 and 40 months, respectively, but similar to 60 % of the non-emerged peripheral achenes morphs were viable after 47 months. Based on our results on diaspore dormancy and those of a previous study of diaspore spatial dispersal of H. szovitsii, we conclude that this species has a high-intermediate-low risk diaspore dispersal/dormancy strategy that likely increases the chances for population persistence over time and space.
英文关键词	Asteraceae diaspore heteromorphism germination phenology high risk/low risk dispersal-dormancy strategy physiological dormancy temporal dispersal unpredictable-precipitation environment
类型	Article
语种	英语
开放获取类型	gold, Green Published
收录类别	SCI-E
WOS记录号	WOS:000597237300001
WOS关键词	HETERACIA-SZOVITSII ASTERACEAE ; HETEROMORPHIC ACHENES ; SEED HETEROMORPHISM ; DISPERSAL ; PERICARP ; ECOLOGY
WOS类目	Plant Sciences ; Ecology
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/327880
作者单位	[Lu, Juanjuan; Dong, Wenjing; Tan, Dunyan; Baskin, Carol C.; Baskin, Jerry M.] Xinjiang Agr Univ, Coll Grassland & Environm Sci, Urumqi 830052, Peoples R China; [Baskin, Carol C.; Baskin, Jerry M.] Univ Kentucky, Dept Biol, Lexington, KY 40506 USA; [Baskin, Carol C.] Univ Kentucky, Dept Plant & Soil Sci, Lexington, KY 40546 USA
推荐引用方式 GB/T 7714	Lu, Juanjuan,Dong, Wenjing,Tan, Dunyan,et al. Dormancy and germination of the trimorphic achenes of a cold desert annual: spreading the risk over time[J],2020,12(6).
APA	Lu, Juanjuan,Dong, Wenjing,Tan, Dunyan,Baskin, Carol C.,&Baskin, Jerry M..(2020).Dormancy and germination of the trimorphic achenes of a cold desert annual: spreading the risk over time.AOB PLANTS,12(6).
MLA	Lu, Juanjuan,et al."Dormancy and germination of the trimorphic achenes of a cold desert annual: spreading the risk over time".AOB PLANTS 12.6(2020).