Effects of soil type, period of burial and moisture levels on the germination of Oncocyclus iris seeds

doi:10.1007/s11258-019-00971-8

	Effects of soil type, period of burial and moisture levels on the germination of Oncocyclus iris seeds
	Volis, Sergei 1; Dorman, Michael 2
通讯作者	Volis, Sergei(svolis@gmail.com)
	2019-11-01
发表期刊	PLANT ECOLOGY
ISSN	1385-0237
卷号	220 期号:11 页码:1021-1028
摘要	Understanding germination of seeds constituting a persistent soil seed bank is important because the ability to predict longevity of a seed in soil and a particular combination of environmental conditions supporting dormancy break and germination can be critical for restoration of threatened species having poor regeneration. We studied the pattern of germination under experimentally manipulated environmental conditions in several threatened iris species of section Oncocyclus. In the first experiment, spanning 11 years, we manipulated soil type and precipitation regime, and in the second experiment, spanning 7 years, we tested an effect of cumulative amount of rainfall during a season on germination. In all studied species the germination process was intermittent, with distinct germination pulses separated by years with no or very low germination. High innate dormancy appears to be a general property of newly produced seeds of Oncocyclus irises, but there are exceptions. Although in three tested Oncocyclus species considerable (above 25%) germination fraction was observed only in the second and subsequent seasons regardless of the soil moisture experienced by a seed, in Iris atropurpurea it occurred in the first season under watering equivalent or exceeding cumulative seasonal precipitation of 100 mm. In the three other species, although high cumulative germination percentage was observed by year four under all experimental conditions a substantial fraction of seeds was still ungerminated and viable. Our results have important conservation implications. We recommend for mass seed germination creation of a soil seed bank under natural conditions with minimal modifications, monitored for more than two years. Supplementary watering (if feasible) will speed up the germination process and shading will have a similar effect but neither of these two is a requirement.
关键词	Seed dormancy Sequential germination Iris Oncocyclus
DOI	10.1007/s11258-019-00971-8
收录类别	SCI ; SCI
语种	英语
WOS记录号	WOS:000493679000002
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/70936
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
通讯作者	Volis, Sergei
作者单位	1.Chinese Acad Sci, Kunming Inst Bot, Key Lab Plant Divers & Biogeog East Asia, Kunming 650204, Yunnan, Peoples R China 2.Ben Gurion Univ Negev, Geog Dept, IL-84105 Beer Sheva, Israel
推荐引用方式 GB/T 7714	Volis, Sergei,Dorman, Michael. Effects of soil type, period of burial and moisture levels on the germination of Oncocyclus iris seeds[J]. PLANT ECOLOGY,2019,220(11):1021-1028.
APA	Volis, Sergei,&Dorman, Michael.(2019).Effects of soil type, period of burial and moisture levels on the germination of Oncocyclus iris seeds.PLANT ECOLOGY,220(11),1021-1028.
MLA	Volis, Sergei,et al."Effects of soil type, period of burial and moisture levels on the germination of Oncocyclus iris seeds".PLANT ECOLOGY 220.11(2019):1021-1028.

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