干旱区生态环境知识资源中心(Arid): Seed responses to temperature indicate different germination strategies among Festuca pallescens populations from semi-arid environments in North Patagonia

Arid

DOI	10.1016/j.agrformet.2019.04.002
	Seed responses to temperature indicate different germination strategies among Festuca pallescens populations from semi-arid environments in North Patagonia
	Lopez, Aldana S.1; Marchelli, Paula 1; Batlla, Diego 2; Lopez, Dardo R.3; Arana, Maria V.1
通讯作者	Lopez, Aldana S.
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
ISSN	0168-1923
EISSN	1873-2240
出版年	2019
卷号	272 页码:81-90
英文摘要	Seed germination is one of the earliest phenotypes expressed by plants, and the accuracy to germinate in the correct time and place is essential for plant population fitness. Cues that regulate germination have been exhaustively characterized in laboratory experiments. However, the way in which seed populations respond to these cues and the ecological meanings of this phenomenon are scarcely known. To help filling this gap, we studied the thermic regulation of seed germination and its link with local climatic characteristics in Festuca pallescens populations, an iconic perennial grass species of Patagonia. By coupling thermal time models with field and environmental data, we evaluated seed responsiveness to temperature during germination of nine Festuca pallescens populations distributed across their complete longitudinal range in North Patagonia. The idea behind this experimental design was to search for inter-population differences in early life traits relevant for recruitment of the species, and associate seed traits with local environmental characteristics. F. pallescens populations showed strong differences in seed sensitivity to temperature for the thermal regulation of the germination rate, described by the population mean thermal time for germination (theta((50))) and its standard deviation (sigma(theta)). The greatest values of theta((50)) and sigma(theta) corresponded to populations inhabiting harsh environments. Moreover, theta((50)) of the different populations showed strong correlations with their local thermal environmental parameters, indicating a relation between seed physiological traits and climate across the longitudinal gradient. We did not observe inter-population differences in the minimum temperature that allows germination (Tb = -0.47 +/- 0.19 degrees C). Higher theta((50)) and as in populations from harsh climates may constitute a strategy of the species to increase fitness in hostile habitats, preventing anticipated germination and promoting a slower seed bank depletion in regions where establishment is highly limited.
英文关键词	North Patagonian rangelands Arid and semiarid environments Temperature Festuca pallescens Germination Thermal time model
类型	Article
语种	英语
国家	Argentina
收录类别	SCI-E
WOS记录号	WOS:000469158400008
WOS关键词	THERMAL TIME ; BASE TEMPERATURE ; GRAIN LEGUMES ; EMERGENCE ; BANK ; GRASSLAND ; GRASSES ; MODEL ; ARGENTINA ; DYNAMICS
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/213956
作者单位	1.INTA EEA Bariloche CONICET, IFAB Inst Invest Forestales & Agropecuarias Baril, Modesta Victoria 4450, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina; 2.Univ Buenos Aires, IFEVA Catedra Cerealicultura, Fac Agron, Av San Martin 4453,C1417DSE, Buenos Aires, DF, Argentina; 3.EP Villa Dolores, INTA, Cordoba, Argentina
推荐引用方式 GB/T 7714	Lopez, Aldana S.,Marchelli, Paula,Batlla, Diego,et al. Seed responses to temperature indicate different germination strategies among Festuca pallescens populations from semi-arid environments in North Patagonia[J],2019,272:81-90.
APA	Lopez, Aldana S.,Marchelli, Paula,Batlla, Diego,Lopez, Dardo R.,&Arana, Maria V..(2019).Seed responses to temperature indicate different germination strategies among Festuca pallescens populations from semi-arid environments in North Patagonia.AGRICULTURAL AND FOREST METEOROLOGY,272,81-90.
MLA	Lopez, Aldana S.,et al."Seed responses to temperature indicate different germination strategies among Festuca pallescens populations from semi-arid environments in North Patagonia".AGRICULTURAL AND FOREST METEOROLOGY 272(2019):81-90.