摘要
剑叶金鸡菊本地蜂平均每朵花序每30 min访花昆虫数约10个左右,平均飞行距离为12.71 cm,最长飞行距离为60 cm,每朵花停留时间较长约10 s,每个传粉昆虫平均访问剑叶金鸡菊基株数为2.59株。充足的花粉资源、访花昆虫数量多及每个飞行回合较高访问基株数,以及剑叶金鸡菊生育期后期出现的游击型克隆生长特性使得有利于居群相同基因型克隆分株的驱散,这样的一些特性降低了同株授粉的几率,保障了花粉资源,从而避免了克隆性对异交交配系统的不利影响,保证了高异交率。这样克隆生长没有影响到有性生殖,相反剑叶金鸡菊可以发挥两种繁殖策略的优势,从而促进入侵。
The main pollinator behaviors of Coreopsis lanceolata were observed. The average flight distance of native bees is 12. 71 cm,and the farthest distance is 60 cm in population. They usually stay on one florescence for 10 sec. It could visit 2. 59 plants between its come-and-go in population. Our results showed that high pollen viability and pollinator movement and a lot of visiting bees ensure high out-crossing rate（ the yield of seeds is about 12000 per plant）. In this paper,we simulated the distribution of different genetic ramets of C. lanceolata,the results showed that different genetic ramets mixing standard influence the seed-setting remarkably. High genetic diversity of population,the pollinator movement and the guerrilla growth strategy could disperse the ramets,these traits lower the rate of geitonogamy. Therefore,the disadvantage of clonal outbreeding mating system could be avoided effectively,C. lanceolata could keep a high outcrossing rate. This strategy could improve its invasive ability.
出处
《植物研究》
CAS
CSCD
北大核心
2014年第5期650-654,共5页
Bulletin of Botanical Research
基金
三峡库区生态环境与生物资源省部共建国家重点实验室开放基金(SKL-2010-04)
江西省自然科学基金(20114BAB204011)
关键词
剑叶金鸡菊
克隆繁殖
交配系统
Coreopsis lanceolata
clonal breeding
mating system
