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题名: Dormancy-Related Seed Positional Effect in Two Populations of an Annual Grass from Locations of Contrasting Aridity
作者: Volis, Sergei
刊名: PLOS ONE
关键词: OATS AVENA-FATUA ; VARIABLE ENVIRONMENTS ; PURE LINES ; DESERT ; GERMINATION ; DEMOGRAPHY ; CONSEQUENCES ; TEMPERATURE ; DYNAMICS ; BANKING
英文摘要: In grasses, variation in seed size and dormancy often results from a seed's position within a dispersal unit. In this paper, I asked whether seed positional effect within a spikelet contributes to ecotypic differentiation between two populations of Avena sterilis having different species range position and associated aridity. I created experimental seed banks in which germination of seeds (florets) having different positions within a spikelet was examined over three years. In addition, two germination tests were conducted under controlled conditions. The two populations were found to have a short-living soil seed bank due to sequential germination of the florets. Although positional seed dormancy effect in A. sterilis does not appear to be a specific desert adaptation against unpredictability of rainfall events, this trait does contribute to ecotypic differentiation between desert and Mediterranean populations. Consistent with bet hedging buffering against rainfall unpredictability, germination fractions in the first year were higher in the Mediterranean than in the desert population, while seeds of the desert origin had stronger dormancy and more sequential germination of florets.
出版日期: 2014-03-27
卷号: 9, 期号:3, 页码:e93061
DOI标识: 10.1371/journal.pone.0093061
语种: 英语
ISSN号: 1932-6203
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/18061
Appears in Collections:资源植物与生物技术所级重点实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Kunming Inst Bot, Key Lab Plant Div & Biogeog East Asia, Kunming, Peoples R China

Recommended Citation:
Volis,Sergei.Dormancy-Related Seed Positional Effect in Two Populations of an Annual Grass from Locations of Contrasting Aridity,PLOS ONE,2014,9(3):e93061
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