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Cell number explains the intraspecific spur-length variation in an Aquilegia species
Zhou, Zhi-Li1,2; Duan, Yuan-Wen1; Luo, Yan3; Yang, Yong-Ping1; Zhang, Zhi-Qiang4
Corresponding AuthorYang, Yong-Ping( ; Zhang, Zhi-Qiang(
Source PublicationPLANT DIVERSITY
AbstractVariations of nectar spur length allow pollinators to utilize resources in novel ways, leading to the different selective pressures on spurs and allowing taxa to diversify. However, the mechanisms underlying spur length variation remain unclear. Interspecific comparisons of spur length suggest that both cell division and anisotropic expansion could explain the changes of spur length, and that hormone-related genes contribute to the process of spur formation. In contrast, little is known about intraspecific spur length variation. In Aquilegia rockii, spur length varies strikingly, ranging from 1 mm to 18 mm. To examine the potential mechanisms underlying spur length variation in A. rockii, we observed cell morphology and analyzed RNA-seq of short- and long-spurred flowers. Scanning electron microscopy revealed that at two positions on spurs there were no differences in either cell density or cell anisotropy between short- and long-spurred flowers, suggesting that in A. rockii changes in cell number may explain variations in spur length. In addition, we screened transcriptomes of short- and long-spurred flowers for differentially expressed genes; this screen identified several genes linked to cell division (e.g., F-box, CDKB2-2, and LST8), a finding which is consistent with our analysis of the cellular morphology of spurs. However, we did not find any highly expressed genes involved in the hormone pathway in long-spurred flowers. In contrast to previous hypotheses that anisotropic cell expansion leads to interspecific spur variation in Aquilegia, our results suggest that cell number changes and related genes are mainly responsible for spur length variations of A. rockii. Furthermore, the underlying mechanisms of similar floral traits in morphology may be quite different, enriching our understanding of the mechanisms of flower diversity in angiosperms. Copyright (C) 2019 Kunming Institute of Botany, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.
KeywordAquilegia rockii Cell number Columbine Floral polymorphism Intraspecific variation Nectar spur
Indexed BySCI ; SCI
WOS IDWOS:000497462900003
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Document Type期刊论文
Corresponding AuthorYang, Yong-Ping; Zhang, Zhi-Qiang
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res Kunming, Kunming Inst Bot, Kunming 650201, Yunnan, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Gardening & Hort Dept, Xishuangbanna Trop Bot Garden, Mengla 666303, Peoples R China
4.Yunnan Univ, Lab Ecol & Evolutionary Biol, Kunming 650091, Yunnan, Peoples R China
Recommended Citation
GB/T 7714
Zhou, Zhi-Li,Duan, Yuan-Wen,Luo, Yan,et al. Cell number explains the intraspecific spur-length variation in an Aquilegia species[J]. PLANT DIVERSITY,2019,41(5):307-314.
APA Zhou, Zhi-Li,Duan, Yuan-Wen,Luo, Yan,Yang, Yong-Ping,&Zhang, Zhi-Qiang.(2019).Cell number explains the intraspecific spur-length variation in an Aquilegia species.PLANT DIVERSITY,41(5),307-314.
MLA Zhou, Zhi-Li,et al."Cell number explains the intraspecific spur-length variation in an Aquilegia species".PLANT DIVERSITY 41.5(2019):307-314.
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