Responses of seed germination of five Asteraceae species to temperature and their invasivity
Seed germinations of five Asteraceae species including Bidens pilosa,Mikania micrantha,Wedelia trilobata,Ageratum conyzoides and Eclipta prostrata (a native species) from eastern Guangdong were studied following wet-storage at 15 ℃ for 30 days and then incubation at 25 ℃ or 25/15 ℃ for 30 days,to reveal the response of germination to temperature.The result showed that B.pilosa,E.prostrate,A.conyzoides,M.micrantha and W.trilobata seeds germinated to 100％,98％,62％-78％,44％-52％,2％ (at 25 ℃2)-86％ (at 25/15 ℃) after seed dispersal,respectively.At the first stage (at 15 ℃ under wet condition),the germination percentages of five Composite plants were 82％-91％ (B.pilosa),19％-26％ (W.trilobata),8.7％-12％ (E.prostrata),0-1％ (W.trilobata),0％ (A.conyzoides).At the second stage (at 25 ℃ and 25/15 ℃),seeds of A.conyzoides germinated to 35％ and 49％,E.prostrate to 58％-68％,W.trilobata to 4％ (at 25 ℃) and 55％ (at 25/15 ℃).Quick germination,high germination percentages,and broad temperature adaptation of germination may be important characters of these alien invasive plants.
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