Seed germination response to diurnally alternating temperatures: Comparative studies on alpine and subalpine meadow populations

doi:10.1016/j.gecco.2023.e02503

LZUFE-KMS

	Seed germination response to diurnally alternating temperatures: Comparative studies on alpine and subalpine meadow populations
	Xu, Jing 1; Du, Guozhen 2
	2023-08
发表期刊	GLOBAL ECOLOGY AND CONSERVATION
卷号	44
摘要	Germination is considered one of the most important stages influenced by environmental factors, with timing and abundance determining plant establishment and recruitment. However, seed germination traits in alpine/subalpine grasslands are poorly understood, despite alpine/subalpine plant populations are vulnerable to climate warming. In order to investigate seed germination response to diurnally alternating temperature (AT) and figure out the response differentiation between alpine and subalpine meadow plant populations, we sampled seeds from 140 populations representing 70 species across an elevation gradient on the eastern edge of the Tibetan Plateau. Seeds were exposed to two AT treatments to estimate the germination-related traits. Our results showed that germination characteristics in alpine/subalpine meadow populations were closely linked to AT. Under higher AT, both subalpine and alpine meadow plants exhibited longer MTG (mean germination time) and lower SYN (germination synchrony). The MTG of subalpine and alpine meadow populations were significantly prolonged by 1.40 d and 0.78 d, respectively, and the SYN were reduced by 0.07 and 0.04 respectively, under higher AT. The GNP (germination percentage) and UNC (germination uncertainty) of subalpine meadow plants also had significant differences between the two temperature treatments, indicated that subalpine meadow plants were more sensitive to AT changes. Furthermore, under higher and lower AT treatments, mean MTG of alpine plants was prolonged by 1.010 d and 1.397 d for each 1 mg increase in seed mass, respectively, and the mean SYN decreased by 0.017 and 0.019 for every 1 mg increase in seed mass, respectively. However, subalpine meadow plants only showed a positive correlation between UNC and seed mass, and a negative correlation between SYN and seed mass at higher AT when controlling for the effects of phylogeny, life history and plant size. Our results also suggest that rapid synchronous germination and delayed asynchronous germination coexist in taxa.
关键词	Seed germination Diurnal alternating temperature Seed mass Life history Alpine/subalpine meadow Tibetan Plateau
DOI	10.1016/j.gecco.2023.e02503
收录类别	SCIE
语种	英语
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
WOS类目	Biodiversity Conservation ; Ecology
WOS记录号	WOS:001053201100001
出版者	ELSEVIER
原始文献类型	Article
EISSN	2351-9894
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.lzufe.edu.cn/handle/39EH0E1M/35171
专题	兰州财经大学
通讯作者	Xu, Jing
作者单位	1.Lanzhou Univ Finance & Econ, Sch Agr & Forestry Econ & Management, Lanzhou 730101, Peoples R China; 2.Lanzhou Univ, State Key Lab Grassland Agroecosyst, Lanzhou 730000, Peoples R China
第一作者单位	兰州财经大学
通讯作者单位	兰州财经大学
推荐引用方式 GB/T 7714	Xu, Jing,Du, Guozhen. Seed germination response to diurnally alternating temperatures: Comparative studies on alpine and subalpine meadow populations[J]. GLOBAL ECOLOGY AND CONSERVATION,2023,44.
APA	Xu, Jing,&Du, Guozhen.(2023).Seed germination response to diurnally alternating temperatures: Comparative studies on alpine and subalpine meadow populations.GLOBAL ECOLOGY AND CONSERVATION,44.
MLA	Xu, Jing,et al."Seed germination response to diurnally alternating temperatures: Comparative studies on alpine and subalpine meadow populations".GLOBAL ECOLOGY AND CONSERVATION 44(2023).