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

doi:10.1007/s00442-016-3576-7

	Seed heteromorphism in Triticum dicoccoides: association between seed positions within a dispersal unit and dormancy
	Volis, Sergei
	2016-06-01
发表期刊	OECOLOGIA
卷号	181 期号:2 页码:401-412
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.
关键词	Seed Polymorphism Bet Hedging Seed Mass Temporal Heterogeneity Adaptive Variation
DOI	10.1007/s00442-016-3576-7
收录类别	SCI
语种	英语
WOS记录号	WOS:000376296000008
引用统计	被引频次：27[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/26242
专题	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.

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