Reversible colour change in leaves enhances pollinator attraction and reproductive success in Saururus chinensis (Saururaceae)
Reversible colour change in leaves enhances pollinator attraction and reproductive success in Saururus chinensis (Saururaceae)
复制标题
叶子的可逆颜色变化增强了三白草（三白草科）传粉者的吸引力和繁殖成功率
DOI：
10.1093/aob/mcx195
复制
发表时间：
2018-03-01
期刊：
影响因子：
4.2
通讯作者：
Sun, Hang
中科院分区：
文献类型：
--
作者：
Song, Bo;Stocklin, Jurg;Sun, Hang
背景与目的
虽然已经有很多的实验工作与非生物环境因素和拮抗剂产生的选择叶色变化，叶色变化的传粉吸引的作用在很大程度上被忽视。我们测试了在开花期间对着三白草花序的顶叶的变白是否增强了对传粉者的吸引力，以及开花后的白色叶的重新变绿是否增加了碳同化并促进了种子发育。
方法
除去或覆盖白色叶，并评估这些操作对传粉者访问和随后的繁殖成功的影响。测定了不同颜色叶片的净光合速率，并评价了其光合作用对种子发育的贡献。
关键成果
三白草能够自主自花授粉，但主要依靠苍蝇授粉。白色叶与绿色具有不同的反射光谱，并且白色叶显著吸引更多的传粉者，导致显著更高的结实率和结实率。虽然叶白化导致光合能力的降低，但它只转化为种子质量的小幅下降。开花后，当叶片由白色转回到绿色时，其光合能力与“正常”绿色叶片的光合能力相似，并促进种子发育。
结论
S. chinensis似乎是适应性的，因为它在开花期间提高授粉成功率，光合作用成本很小，而开花后这些叶子的重新绿化有助于满足种子发育的碳需求。
Background and Aims
Although there has been much experimental work on leaf colour change associated with selection generated by abiotic environmental factors and antagonists, the role of leaf colour change in pollinator attraction has been largely ignored. We tested whether whitening of the apical leaves subtending the inflorescences of Saururus chinensis during flowering enhances pollinator attraction, and whether re-greening of the white leaves after flowering increases carbon assimilation and promotes seed development.
Methods
White leaves were removed or covered, and the effects of these manipulations on pollinator visitation and subsequent reproductive success were assessed. The net photosynthetic rates of leaves of different colour were measured and their photosynthetic contributions to seed development were evaluated.
Key Results
Saururus chinensis is able to self-pollinate autonomously, but depends largely on flies for pollination. White leaves had different reflectance spectra from green leaves, and white leaves attracted significantly more pollinators and led to significantly higher fruit and seed set. Although leaf whitening resulted in a reduction in photosynthetic capacity, it translated into only a small decrease in seed mass. When leaves had turned back from white to green after flowering their photosynthetic capacity was similar to that of 'normal' green leaves and promoted seed development.
Conclusions
The reversible leaf colour change in S. chinensis appears to be adaptive because it enhances pollination success during flowering, with a small photosynthetic cost, while re-greening of these leaves after flowering helps to meet the carbon requirements for seed development.