Comparative pollen-pistil interactions and insect pollination in two Hypoxis species (Hypoxidaceae) in China and North America
Ren, Zong-Xin1; Bernhardt, Peter2; Edens-Meier, Retha3; Zweck, Justin4; Arduser, Mike5; Li, Hai-Dong1; Wang, Hong1
2019-02-01
Source PublicationPLANT SYSTEMATICS AND EVOLUTION
ISSN0378-2697
Volume305Issue:2Pages:115-126
AbstractWe compared the floral ecology and pollen-pistil interactions in Hypoxis hirsuta (L.) Coville from North America and Hypoxis aurea Loureiro from China. Both species are vernal-flowering herbs, with yellow perianths, providing pollen as their only reward. In H. hirsuta, hand self-pollinated, emasculated and bagged control flowers failed to set fruit. When cross-pollinated, 77% of the pistils produced seed-filled capsules while 72% of open, insect-pollinated flowers set seed. Epifluorescence showed that most germinating grains failed to penetrate the stigmatic surface >24h after hand self-pollination suggesting early-acting self-incompatibility (SI). The majority of pollinators of H. hirsuta were female bees representing 21 species distributed in four families. Pollen load analyses indicated that most bees were polylectic and carried grains of H. hirsuta mixed with pollen of co-blooming, nectariferous species. In contrast, capsule production of H. aurea was 60% for open, insect-pollinated flowers. Pollen tubes of H. aurea also entered ovules within 24h, and SI of this species was partial. Evidence of a late-acting rejection in this species following self-pollination included abnormal growth of pollen tubes in styles with fewer tubes penetrating ovules. In contrast, abnormal tube growth was not observed in styles ofH. hirsuta. Hypoxis aurea received fewer insect visitations. Pollen was dispersed primarily by hoverflies (Syrphidae) followed by bees. Floral presentation, generalist pollination and two modes of SI found in these two Hypoxis species contribute to our understanding of floral evolution for congeners isolated on different continents.
KeywordBees Hoverflies Hypoxidaceae Hypoxis Self-incompatibility
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.kib.ac.cn/handle/151853/64257
Collection中国科学院东亚植物多样性与生物地理学重点实验室
Corresponding AuthorRen, Zong-Xin; Wang, Hong
Affiliation1.Chinese Acad Sci, Kunming Inst Bot, Key Lab Plant Divers & Biogeog East Asia, Kunming 650201, Yunnan, Peoples R China
2.St Louis Univ, Dept Biol, St Louis, MO 63103 USA
3.St Louis Univ, Sch Educ, St Louis, MO 63103 USA
4.Univ Minnesota, Dept Biol, Duluth, MN 55812 USA
5.Missouri Dept Conservat, St Charles, MO 63304 USA
Recommended Citation
GB/T 7714
Ren, Zong-Xin,Bernhardt, Peter,Edens-Meier, Retha,et al. Comparative pollen-pistil interactions and insect pollination in two Hypoxis species (Hypoxidaceae) in China and North America[J]. PLANT SYSTEMATICS AND EVOLUTION,2019,305(2):115-126.
APA Ren, Zong-Xin.,Bernhardt, Peter.,Edens-Meier, Retha.,Zweck, Justin.,Arduser, Mike.,...&Wang, Hong.(2019).Comparative pollen-pistil interactions and insect pollination in two Hypoxis species (Hypoxidaceae) in China and North America.PLANT SYSTEMATICS AND EVOLUTION,305(2),115-126.
MLA Ren, Zong-Xin,et al."Comparative pollen-pistil interactions and insect pollination in two Hypoxis species (Hypoxidaceae) in China and North America".PLANT SYSTEMATICS AND EVOLUTION 305.2(2019):115-126.
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