{"title":"Role of temperature in the germination ecology of the summer annual Bidens polylepis Blake (Asteraceae)","authors":"C. Baskin, J. Baskin, E. W. Chester","doi":"10.2307/2996319","DOIUrl":null,"url":null,"abstract":"sequentially to simulated March-October temperatures in incubators or (3) exposed to 25/15 or 30/15?C for 24 and 12 weeks, respectively. As seeds entered dormancy, they first lost the ability to germinate at 15/6?C and then at higher temperatures. Buried seeds exposed to seasonal temperature changes for 28 months in the nonheated greenhouse exhibited an annual dormancy/nondormancy cycle, with full dormancy occurring in September-November. Seeds came out of dormancy in winter (December-March), and they germinated to 8596% in light at simulated habitat temperatures from mid-April until July. Although 20-50% of the seeds germinated in darkness at simulated habitat temperatures in spring (March-June), only 2% of them germinated while buried in soil in the nonheated greenhouse. Thus, seeds have the potential to form a persistent seed bank.","PeriodicalId":9453,"journal":{"name":"Bulletin of the Torrey Botanical Club","volume":"122 1","pages":"275"},"PeriodicalIF":0.0000,"publicationDate":"1995-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2307/2996319","citationCount":"24","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bulletin of the Torrey Botanical Club","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2307/2996319","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 24
Abstract
sequentially to simulated March-October temperatures in incubators or (3) exposed to 25/15 or 30/15?C for 24 and 12 weeks, respectively. As seeds entered dormancy, they first lost the ability to germinate at 15/6?C and then at higher temperatures. Buried seeds exposed to seasonal temperature changes for 28 months in the nonheated greenhouse exhibited an annual dormancy/nondormancy cycle, with full dormancy occurring in September-November. Seeds came out of dormancy in winter (December-March), and they germinated to 8596% in light at simulated habitat temperatures from mid-April until July. Although 20-50% of the seeds germinated in darkness at simulated habitat temperatures in spring (March-June), only 2% of them germinated while buried in soil in the nonheated greenhouse. Thus, seeds have the potential to form a persistent seed bank.