Seed bank dynamics of an invasive alien species, Helianthus annuus L.

作     者：Alejandro Presotto Fernando Hernández Mauricio Casquero Roman Vercellino Claudio Pandolfo Mónica Poverene Miguel Cantamutto Alejandro Presotto;Fernando Hernández;Mauricio Casquero;Roman Vercellino;Claudio Pandolfo;Mónica Poverene;Miguel Cantamutto

作者机构：Dpto.AgronomíaUniversidad Nacional del Sur(UNS)San Andrés 8008000 Bahía BlancaArgentina CERZOSUniversidad Nacional del Sur(UNS)-CONICETCamino La Carrindanga Km 78000 Bahía BlancaArgentina Corteva Agriscience.Integrated field SciencesRN N178 Km 112700 PergaminoArgentina Estación Experimental Agropecuaria Hilario AscasubiInstituto Nacional de Tecnología Agropecuaria(INTA)RN N3 Km 7948142 Hilario AscasubiArgentina 

出 版 物：《Journal of Plant Ecology》 (植物生态学报（英文版）)

年 卷 期：2020年第13卷第3期

页      面：313-322页

核心收录：

学科分类：09[农学] 0901[农学-作物学] 

基　　金：supported by the National Agency for Scientific and Technological Promotion(PICT 2012-2854) by the Universidad Nacional del Sur(PGI 24/A204) 

主　　题：seed bank seed persistence wild sunflower invasive alien species ruderal agrestal 

摘      要：Aims The ability to form persistent seed banks is one of the best predictors of species’potential to establish in new *** sunflower is native to North America where the formation of persistent seed banks is promoted by disturbance and it plays a key role on the establishment and persistence of native ***,the role of the seed banks on the establishment and persistence of invasive populations has not been ***,we evaluated the role of seed bank and disturbance on the establishment and fitness,and seed persistence in the soil in several sunflower biotypes collected in ruderal(wild Helianthus annuus)and agrestal(natural crop–wild hybrid)habitats of Argentina as well as volunteer populations(progeny of commercial cultivars).Methods In a seed-bank experiment,we evaluated emergence,survival to reproduction,survival of emerged seedlings,inflorescences per plant and per plot under disturbed and undisturbed conditions over 2 years;in a seed-burial experiment,we evaluated seed persistence in the soil over four springs(6,18,30 and 42 months).Important Findings Overall,seedling emergence was early in the growing season(during winter),and it was promoted by disturbance,especially in the first *** this,the number of inflorescences per plot was similar under both conditions,especially in *** the second year,emergence from the seed bank was much lower,but the survival rate was *** the seed-burial experiment,genetic differences were observed but seeds of ruderals and agrestals persisted up to 42 months while seeds of the volunteer did not persist longer than 6 *** agrestal biotype showed an intermediate behavior between ruderals and volunteers in both *** findings showed that wild and crop–wild sunflower can form persistent seed banks outside its native range and that disturbance may facilitate its establishment in new areas.