ArticleAnnals of botany2014
Unidirectional hybridization and reproductive barriers between two heterostylous primrose species in north-west Yunnan, China.
Article in Annals of botany, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.
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15 citing papers in PubMed.
- Article
- Over 30 Years of Misidentification: A New NothospeciesPlants (Basel, Switzerland) · 2022Article
- Unusual patterns of hybridization involving two alpineFrontiers in plant science · 2022Article
- Horticultural applications of natural hybrids as an accelerating way for breeding woody ornamental plants.Frontiers in genetics · 2022Article
- Natural hybridization between two butterfly bushes in Tibet: dominance of FBMC plant biology · 2021Article
- Speciation and subsequent secondary contact in two edaphic endemic primroses driven by Pleistocene climatic oscillation.Heredity · 2020Article
- Homoploid hybridization of plants in the Hengduan mountains region.Ecology and evolution · 2019Review
- Conservation implications of asymmetric introgression and reproductive barriers in a rare primrose species.BMC plant biology · 2019Article
- Molecular evidence for asymmetric hybridization in three closely related sympatric species.AoB PLANTS · 2018Article
- Both morph- and species-dependent asymmetries affect reproductive barriers between heterostylous species.Ecology and evolution · 2016Article
- Pollinator-Mediated Isolation May Be an Underestimated Factor in Promoting Homoploid Hybrid Speciation.Frontiers in plant science · 2016Article
- Evidence for asymmetrical hybridization despite pre- and post-pollination reproductive barriers between two Silene species.AoB PLANTS · 2016Article
- Natural hybridization and asymmetric introgression at the distribution margin of two Buddleja species with a large overlap.BMC plant biology · 2015Article
- Asymmetrical disassortative pollination in a distylous primrose: the complementary roles of bumblebee nectar robbers and syrphid flies.Scientific reports · 2015Article
- DNA barcoding evaluation and its taxonomic implications in the species-rich genus Primula L. in China.PloS one · 2015Article
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6 authors.
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No grant is acknowledged in the PubMed record.
Abstract
BACKGROUND AND
aimsHeteromorphy in flowers has a profound effect on breeding patterns within a species, but little is known about how it affects reproductive barriers between species. The heterostylous genus Primula is very diverse in the Himalaya region, but hybrids there have been little researched. This study examines in detail a natural hybrid zone between P. beesiana and P. bulleyana.
methodsChloroplast sequencing, AFLP (amplified fragment length polymorphism) markers and morphological comparisons were employed to characterize putative hybrids in the field, using synthetic F1s from hand pollination as controls. Pollinator visits to parent species and hybrids were observed in the field. Hand pollinations were conducted to compare pollen tube growth, seed production and seed viability for crosses involving different morphs, species and directions of crossing. KEY
resultsMolecular data revealed all hybrid derivatives examined to be backcrosses of first or later generations towards P. bulleyana: all had the chloroplast DNA (cpDNA) of this species. Some individuals had morphological traits suggesting they were hybrids, but they were genetically similar to P. bulleyana; they might have been advanced generation backcrosses. Viable F1s could not be produced with P. bulleyana pollen on P. beesiana females, irrespective of the flower morphs used. Within-morph crosses for each species had very low (<10 %) seed viability, whereas crosses between pin P. bulleyana (female) and pin P. beesiana had a higher seed viability of 30 %. Thus genetic incompatibility mechanisms back up mechanical barriers to within-morph crosses in each species, but are not the same between the two species. The two species share their main pollinators, and pollinators were observed to fly between P. bulleyana and hybrids, suggesting that pollinator behaviour may not be an important isolating factor.
conclusionsHybridization is strongly asymmetric, with P. bulleyana the only possible mother and all detected hybrids being backcrosses in this direction. Partial ecological isolation and inhibition of heterospecific pollen, and possibly complete barriers to F1 formation on P. beesiana, may be enough to make F1 formation very rare in these species. Therefore, with no F1 detected, this hybrid zone may have a finite life span as successive generations become more similar to P. bulleyana.
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