干旱区生态环境知识资源中心(Arid): Aerial seed bank in a cold desert annual-ephemeral species: Role of anatomical structure of stem and delayed fruit dehiscence in timing of seed dispersal

Arid

DOI	10.1111/1442-1984.12274
	Aerial seed bank in a cold desert annual-ephemeral species: Role of anatomical structure of stem and delayed fruit dehiscence in timing of seed dispersal
	Lu, Juanjuan 1; Liu, Bing 1; Tan, Dunyan 1; Baskin, Carol C.1,2,3; Baskin, Jerry M.1,2
通讯作者	Tan, Dunyan
来源期刊	PLANT SPECIES BIOLOGY
ISSN	0913-557X
EISSN	1442-1984
出版年	2020
卷号	35 期号:4 页码:260-269
英文摘要	Why the fruits are retained on dead upright herbaceous plants and how this relates to seed dispersal and timing of germination remain unclear. Stems of the annual Euclidium syriacum (Brassicaceae) with infructescences bearing indehiscent silicles remain upright after plants die in the spring. We investigated the effect of anatomical structures of stem and pedicle and delayed silicle dehiscence on seed dispersal phenology of this species. For comparison, sections were made of the stem of the annual Goldbachia laevigata (Brassicaceae), which has stems that fall over when plants die. Compared to G. laevigata, the stem of E. syriacum has vascular bundles that are closer together, a thicker xylem and phloem, more fibers, a thicker perimedullary zone and a smaller pith diameter:stem diameter ratio. The thickened pedicle did not form an abcission layer. By late October, 5-20% of seeds were dispersed, depending on the position of infructescences on the plant. Snow covered the plants in late autumn and when it melted in mid-April many of the plants had fallen over, with a high number of seeds germinating in attached silicles; seedlings became rooted in soil. After snowmelt, 14-15% of the silicles on the remaining upright plants contained seeds; all seeds were dispersed by early July. The anatomical structures of the stem and pedicle plus the delayed dehiscence of silicles explain the presence of an aerial seed bank in E. syriacum and delay of germination of many of seeds until spring. Further, pieces of upright plants are broken off and dispersed by wind, which helps to explain the wide distribution of E. syriacum in the cold desert.
英文关键词	Brassicaceae herbaceous species indehiscent fruit seed dispersal seed germination
类型	Article
语种	英语
国家	Peoples R China ; USA
收录类别	SCI-E
WOS记录号	WOS:000532549100001
WOS关键词	FIRE ; BRASSICACEAE ; STORAGE
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/2XILL650/319094
作者单位	1.Xinjiang Agr Univ, Coll Grassland & Environm Sci, Urumqi 830052, Peoples R China; 2.Univ Kentucky, Dept Biol, Lexington, KY USA; 3.Univ Kentucky, Dept Plant & Soil Sci, Lexington, KY USA
推荐引用方式 GB/T 7714	Lu, Juanjuan,Liu, Bing,Tan, Dunyan,et al. Aerial seed bank in a cold desert annual-ephemeral species: Role of anatomical structure of stem and delayed fruit dehiscence in timing of seed dispersal[J],2020,35(4):260-269.
APA	Lu, Juanjuan,Liu, Bing,Tan, Dunyan,Baskin, Carol C.,&Baskin, Jerry M..(2020).Aerial seed bank in a cold desert annual-ephemeral species: Role of anatomical structure of stem and delayed fruit dehiscence in timing of seed dispersal.PLANT SPECIES BIOLOGY,35(4),260-269.
MLA	Lu, Juanjuan,et al."Aerial seed bank in a cold desert annual-ephemeral species: Role of anatomical structure of stem and delayed fruit dehiscence in timing of seed dispersal".PLANT SPECIES BIOLOGY 35.4(2020):260-269.