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Sci Rep:中科院版纳植物园张玲研究组揭示使君子花变色对植物繁殖适合度的影响

摘要 : 2016年4月13日,国际学术权威刊物自然出版集团旗下子刊《Scientific Reports》在线发表了中国科学院西双版纳热带植物园动植物关系张玲研究组的研究论文。

 2016年4月13日,国际学术权威刊物自然出版集团旗下子刊《Scientific Reports》在线发表了中国科学院西双版纳热带植物园动植物关系张玲研究组题为Pollinator responses to floral colour change, nectar, scent promote reproductive fitness Quisqualis indica ( Combretaceae ) 的研究论文,硕士研究生严娟为论文第一作者,张玲研究研究员为论文通讯作者。

以往的研究发现,花颜色的改变可能会作为一种视觉信号使传粉者避免拜访旧花,增加其觅食效率,进而提高传粉效率。一些研究表明,在小范围下传粉者可以通过花瓣颜色的差异辨别有报酬的花和无报酬的花,从而降低重复拜访率,避免或减少近交。然而极少有研究将花变色与其他的花部特征(如气味,花蜜等)结合,研究不同颜色阶段传粉者对成功繁殖的贡献率。

研究人员以热带亚洲分布的花变色藤本植物使君子(Quisqualis indica)为材料,借助化学生态学和传粉生态学方法检测了其花变色现象与其它花部特征的共同作用对植物繁殖适合度的影响。研究结果表明,使君子为自交不亲和种类,通过雌雄异熟来避免自花授粉,降低花内雌雄功能干扰;花蜜、气味与花变色过程共同影响使君子传粉者的组成和拜访行为并提高其繁殖适合度,且白花阶段蛾子和蜜蜂对其成功繁殖的贡献更大。使君子的花变色可能是对传粉者缺乏而形成的由夜行性蛾子传粉向日行性蝴蝶传粉的适应性转变。

天蛾在夜间拜访使君子白花(美国自然历史国家博物馆 John Kress 摄)

原文链接:

Pollinator responses to floral colour change, nectar, and scent promote reproductive fitness inQuisqualis indica (Combretaceae)

原文摘要:

Floral colour change is visual signals for pollinators to avoid old flowers and increase pollination efficiency. Quisqualis indica flowers change colour from white to pink to red may be associated with a shift from moth to butterfly pollination. To test this hypothesis, we investigated Q. indica populations in Southwest China. Flowers secreted nectar continuously from the evening of anthesis until the following morning, then decreased gradually with floral colour change. The scent compounds in the three floral colour stages were similar; however, the scent composition was different, and the scent emission rate decreased from the white to red stage. Dichogamy in Q. indica prevents self-pollination and interference of male and female functions. Controlled pollinations demonstrated that this species is self-incompatible and needs pollinators for seed production. Different pollinators were attracted in each floral colour stage; mainly moths at night and bees and butterflies during the day. Observations of open-pollinated inflorescences showed that white flowers had a higher fruit set than pink or red flowers, indicating the high contribution of moths to reproductive success. We concluded that the nectar and scent secretion are related to floral colour change in Q. indica, in order to attract different pollinators and promote reproductive fitness.

来源: Scientific Reports 浏览次数:0

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