摘要
【目的】研究植物种群花性状(包括花报酬)的变异性及其对传粉昆虫访花行为的影响.【方法】以毛地黄鼠尾草为研究对象,测定了该植物自然种群中花部性状和花蜜产量的变异性及相互关系,同时观测了该种群的传粉昆虫及其访花行为.【结果】毛地黄鼠尾草的花部性状在个体间和个体内均存在较大变异,其个体间的变异程度明显大于个体内.花蜜量和小花数的变异系数最大,分别为45%和29%,柱头位置相关性状的变异程度居中(19%～24%),其他花结构性状的变异程度最小.花蜜产量与花大小性状之间存在显著的正相关性.在同一株内,传粉者更倾向于访问相对较大的花,其拜访花的花性状值显著大于未访花(P<0.001);而在不同个体间,传粉者未表现出明显的访花偏好.【结论】毛地黄鼠尾草的花部性状存在较大的可塑性,但个体间相对更大的遗传变异反映出该物种具有通过传粉者选择而不断进化的潜力.
【Objective】 To study the variation in floral traits and their effect on foraging behaviors of pollinators.【Method】 S.digitaloides were employed to measure variation coefficients of floral traits and nectar production,and foraging behavior of pollinators was also observed.【Result】 There was significant variation in floral traits both within and among individuals.The variation coefficients were the highest in nectar volume and floret numbers,followed by traits related to stigma position(19%~24%),and the lowest in other flower structural traits.Nectar production was significantly positively correlated with floral size traits,such as corolla length,thickness,and corolla entrance size.Among flowers with a plant,pollinators tended to visit larger flowers,and the trait values of probed flowers were significantly higher than those of the non-probed(P<0.001).However,pollinators showed no obvious preference when visiting flowers among different individuals.【Conclusion】 There existed relatively larger variation in floral traits among individuals of S.digitaloides,implying the great potential of the species to evolution driven by pollinator selection,although it was indicated great plasticity of floral traits in S.digitaloides.
作者
孙淑范
骆望龙
张勃
SUN Shu-fan;LUO Wang-long;ZHNAG Bo(College of Grassland Science,Gansu Agricultural University,Lanzhou 730070,China)
出处
《甘肃农业大学学报》
CAS
CSCD
北大核心
2019年第1期184-189,共6页
Journal of Gansu Agricultural University
基金
国家自然科学基金项目(41461014)
草业生态系统教育部重点实验室暨甘肃省草学优势学科开放课题-学科建设专项基金(GAU-XKJS-2018-001)
关键词
鼠尾草
雄蕊杠杆
花报酬
传粉
访花偏好
Salvia
staminal lever
floral rewards
pollination
foraging preference
作者简介
第一作者:孙淑范,硕士研究生.E-mail:2511056511@qq.com;通信作者:张勃,博士,副教授,硕士生导师,研究方向为植物繁殖生态、草地生物多样性及生态保护.E-mail:zbsonny@163.com.
