Seed heteromorphism in Triticum dicoccoides: association between seed positions within a dispersal unit and dormancy

CORC > 昆明植物研究所 > 中国科学院昆明植物研究所 > 中国科学院东亚植物多样性与生物地理学重点实验室

	Seed heteromorphism in Triticum dicoccoides: association between seed positions within a dispersal unit and dormancy
	Volis, Sergei
刊名	OECOLOGIA
	2016-06-01
卷号	181 期号:2 页码:401-412
关键词	Seed polymorphism Bet hedging Seed mass Temporal heterogeneity Adaptive variation
英文摘要	Variation in seed size and dormancy can take the form of seed heteromorphism, i.e., production of different kinds of seeds by a single individual. In this paper, I tested for the effect of seed position within a spikelet on its germination over time, and the contribution of this effect to population differentiation along an aridity gradient in an annual grass, Triticum dicoccoides. The results show that the upper grain in a spikelet is larger than the bottom grain, and either germinates in the season following dispersal, or dies. In contrast, a substantial fraction of the bottom grains do not germinate in the first season, but remain dormant in the soil seed bank for 1 and, very rarely, 2 years. This pattern was observed in seeds of all origins, but the bottom grains from the most arid location had the lowest, and from the least arid location, the highest germination fraction in the 1st year and vice versa in the 2nd year. This difference in germination fraction was observed under controlled irrigation conditions but not in the field experiment. These mixed results suggest that seed dimorphism is a life history trait with a complicated evolutionary history and wide adaptive implications. Seed dimorphism in T. dicoccoides could initially be an adaptation for reducing competition in productive (i.e., high precipitation) environments. In addition to this, seed dimorphism under increasing aridity could become a bet-hedging trait allowing a population to survive periods of insufficient rainfall through dormancy.
类目[WOS]	Ecology
研究领域[WOS]	Environmental Sciences & Ecology
关键词[WOS]	BET-HEDGING GERMINATION ; LIFE-HISTORY ; EVOLUTIONARY ECOLOGY ; DELAYED GERMINATION ; ARIDITY GRADIENT ; DESERT ANNUALS ; ANNUAL PLANTS ; MEDITERRANEAN POPULATIONS ; VARIABLE ENVIRONMENTS ; LOCAL ADAPTATION
收录类别	SCI
语种	英语
WOS记录号	WOS:000376296000008
内容类型	期刊论文
源URL	[http://ir.kib.ac.cn/handle/151853/26242]
专题	昆明植物研究所_中国科学院东亚植物多样性与生物地理学重点实验室
推荐引用方式 GB/T 7714	Volis, Sergei. Seed heteromorphism in Triticum dicoccoides: association between seed positions within a dispersal unit and dormancy[J]. OECOLOGIA,2016,181(2):401-412.
APA	Volis, Sergei.(2016).Seed heteromorphism in Triticum dicoccoides: association between seed positions within a dispersal unit and dormancy.OECOLOGIA,181(2),401-412.
MLA	Volis, Sergei."Seed heteromorphism in Triticum dicoccoides: association between seed positions within a dispersal unit and dormancy".OECOLOGIA 181.2(2016):401-412.