Reproductive isolation and pollination success of rewarding Galearis diantha and non-rewarding Ponerorchis chusua (Orchidaceae)

Hui, Sun; Bao-qiang, Huang; Yu, Xiaohong; Kou, Yong; An, Dong; Luo, Yi‐Bo; Ge, Song

doi:10.1093/aob/mcq210

Cited by 17 publications

(19 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…P. F. Hunt and non-rewarding Ponerorchis chusua (D. Don) Soó share some habitats, but partition other habitats in the Himalaya-Hengduan Mountains (SE QTP). Contrary to initial expectations, Sun et al (2011) found that the non-rewarding species neither benefited from nor affected the rewarding species when they grow together, and the fruit set of the rewarding species growing in plots mixed with non-rewarding species was not different from that in monospecific plots. They tentatively ascribed these findings to limited overlap of flowering time and pollinator spectra between the two species.…”

Section: Other Examplescontrasting

confidence: 99%

Survival and reproduction of plant species in the Qinghai–Tibet Plateau

Sun

Yang

Chen

et al. 2014

J of Sytematics Evolution

View full text Add to dashboard Cite

The Qinghai-Tibet Plateau (QTP) is the highest and largest plateau in the world. It covers correspondingly wide geological, topographical, and climatic gradients, and thus hosts greater biodiversity than surrounding lowlands and other high elevation regions. Due to its extreme environmental and biological diversity, the QTP is an ideal region for studying adaptations of plant species under harsh environmental conditions at multiple evolutionary levels. Many recent ecological studies have revealed functions of distinctive morphological features of various plants in the region that improve their reproductive success. Examples include large and showy bracts, hairy inflorescences, and drooping flowers. Numerous other investigations have examined QTP plants' sexual systems, patterns of biomass allocations, and biotic interactions. This paper summarizes recent advances in understanding of morphological adaptations, plantplant interactions, plant-pollinator interactions, floral color patterns, pollination adaptations, and resource allocation patterns of alpine plants of the QTP. The overall aim is to synthesize current knowledge of the general mechanisms of plant survival and reproduction in this fascinating region.

show abstract

Section: Other Examplescontrasting

confidence: 99%

Survival and reproduction of plant species in the Qinghai–Tibet Plateau

Sun

Yang

Chen

et al. 2014

J of Sytematics Evolution

View full text Add to dashboard Cite

show abstract

“…Even though these two co‐occurring orchid species are allocated to different sections of Elleanthus genus, they are useful subjects for testing the hypothesis for the existence of pre‐ and post‐zygotic barriers isolating orchid species (Sun et al . ).…”

Section: Introductionmentioning

confidence: 97%

Pollination ecology of two species of Elleanthus (Orchidaceae): novel mechanisms and underlying adaptations to hummingbird pollination

et al. 2015

View full text Add to dashboard Cite

Relationships among floral biology, floral micromorphology and pollinator behaviour in bird-pollinated orchids are important issues to understand the evolution of the huge flower diversity within Orchidaceae. We aimed to investigate floral mechanisms underlying the interaction with pollinators in two hummingbird-pollinated orchids occurring in the Atlantic forest. We assessed floral biology, nectar traits, nectary and column micromorphologies, breeding systems and pollinators. In both species, nectar is secreted by lip calli through spaces between the medial lamellar surfaces of epidermal cells. Such a form of floral nectar secretion has not been previously described. Both species present functional protandry and are self-compatible yet pollinator-dependent. Fruit set in hand-pollination experiments was more than twice that under natural conditions, evidencing pollen limitation. The absence of fruit set in interspecific crosses suggests the existence of post-pollination barriers between these sympatric co-flowering species. In Elleanthus brasiliensis, fruits resulting from cross-pollination and natural conditions were heavier than those resulting from self-pollination, suggesting advantages to cross-pollination. Hummingbirds pollinated both species, which share at least one pollinator species. Species differences in floral morphologies led to distinct pollination mechanisms. In E. brasiliensis, attachment of pollinarium to the hummingbird bill occurs through a lever apparatus formed by an appendage in the column, another novelty to our knowledge of orchid pollination. In E. crinipes, pollinarium attachment occurs by simple contact with the bill during insertion into the flower tube, which fits tightly around it. The novelties described here illustrate the overlooked richness in ecology and morphophysiology in Orchidaceae.

show abstract

“…Thus, mechanical barriers are rarely measured directly, because precise pollen-grain counts are difficult to acquire (Campbell et al 1998;Wolf et al 2001;Muchhala and Potts 2007;Natalis and Wesselingh 2012). Mechanical isolation has also been indirectly inferred using pollen analogs (Kay 2006;Brock 2009;Martin and Taylor 2013), pollen placement on pollinator's bodies (e.g., Nilsson 1983;Kephart and Theiss 2003;Sun et al 2011), and differential positions of anthers and stigmas in hybridizing species (Yang et al 2007;Keller et al 2012). Complete mechanical isolation has been conclusively demonstrated only for Costus pulverulentus (Kay 2006).…”

Section: Introductionmentioning

confidence: 99%

Both morph‐ and species‐dependent asymmetries affect reproductive barriers between heterostylous species

Keller

Vos

Schmidt‐Lebuhn

et al. 2016

Ecology and Evolution

View full text Add to dashboard Cite

The interaction between floral traits and reproductive isolation is crucial to explaining the extraordinary diversity of angiosperms. Heterostyly, a complex floral polymorphism that optimizes outcrossing, evolved repeatedly and has been shown to accelerate diversification in primroses, yet its potential influence on isolating mechanisms remains unexplored. Furthermore, the relative contribution of pre‐ versus postmating barriers to reproductive isolation is still debated. No experimental study has yet evaluated the possible effects of heterostyly on pre‐ and postmating reproductive mechanisms. We quantify multiple reproductive barriers between the heterostylous Primula elatior (oxlip) and P. vulgaris (primrose), which readily hybridize when co‐occurring, and test whether traits of heterostyly contribute to reproductive barriers in unique ways. We find that premating isolation is key for both species, while postmating isolation is considerable only for P. vulgaris; ecogeographic isolation is crucial for both species, while phenological, seed developmental, and hybrid sterility barriers are also important in P. vulgaris, implicating sympatrically higher gene flow into P. elatior. We document for the first time that, in addition to the aforementioned species‐dependent asymmetries, morph‐dependent asymmetries affect reproductive barriers between heterostylous species. Indeed, the interspecific decrease of reciprocity between high sexual organs of complementary floral morphs limits interspecific pollen transfer from anthers of short‐styled flowers to stigmas of long‐styled flowers, while higher reciprocity between low sexual organs favors introgression over isolation from anthers of long‐styled flowers to stigmas of short‐styled flowers. Finally, intramorph incompatibility persists across species boundaries, but is weakened in long‐styled flowers of P. elatior, opening a possible backdoor to gene flow through intramorph pollen transfer between species. Therefore, patterns of gene flow across species boundaries are likely affected by floral morph composition of adjacent populations. To summarize, our study highlights the general importance of premating isolation and newly illustrates that both morph‐ and species‐dependent asymmetries shape boundaries between heterostylous species.

show abstract

Reproductive isolation and pollination success of rewarding Galearis diantha and non-rewarding Ponerorchis chusua (Orchidaceae)

Cited by 17 publications

References 57 publications

Survival and reproduction of plant species in the Qinghai–Tibet Plateau

Survival and reproduction of plant species in the Qinghai–Tibet Plateau

Pollination ecology of two species of Elleanthus (Orchidaceae): novel mechanisms and underlying adaptations to hummingbird pollination

Both morph‐ and species‐dependent asymmetries affect reproductive barriers between heterostylous species

Contact Info

Product

Resources

About