Germinación y ruptura de latencia en semillas de Daphne giraldii Nitsche (Thymelaeaceae) provenientes del noroeste de China

Fang, Yan; Zhang, Enhe; Wang, Qin-Li; Zhuhong, Mao

doi:10.5154/r.rchscfa.2015.04.015

Cited by 1 publication

(1 citation statement)

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“…comm.). However, because most wild seeds have a dormancy of several years before germination ( Alonso and Herrera, 2001 ; Fang et al ., 2016 ), the life cycle of D. kiusiana is thought to span a period of ~10 years.…”

Section: Methodsmentioning

confidence: 99%

Genetic and demographic signatures accompanying the evolution of the selfing syndrome inDaphne kiusiana, an evergreen shrub

Han

Tamaki

et al. 2022

Annals of Botany

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Background and Aims The evolution of mating systems from outcrossing to self-fertilization is a common transition in flowering plants. This shift is often associated with “selfing syndrome”, which is characterized by less visible flowers with functional changes to control outcrossing. In most cases, the evolutionary history and demographic dynamics underlying the evolution of the selfing syndrome remain poorly understood. Methods Here, we characterize differences in the demographic genetic consequences and associated floral-specific traits between two distinct geographical groups of wild shrub Daphne kiusiana, endemic to East Asia; plants in the eastern region (southeastern Korea and Kyushu, Japan) exhibit smaller, fewer flowers compared to those of plants in the western region (southwestern Korea). Genetic analyses were conducted using nuclear microsatellites and chloroplast DNA (Multiplexed Phylogenetic Marker sequencing: MPM-seq) datasets. Key Results A high selfing rate with significantly exceeded homozygosity characterized the eastern lineage, associated with lower levels of visibility and herkogamy in the floral traits. The two lineages harbored independent phylogeographic histories. In contrast to the western lineage, the eastern lineage showed a gradual reduction in the effective population size with no signs of a severe bottleneck despite its extreme range contraction during the last glacial period. Conclusions Our results suggest that the selfing-associated morphological changes in D. kiusiana are of relatively old origin (at least 100 Kya) and were driven by directional selection for efficient self-pollination. We provide evidence that the evolution of selfing syndrome in D. kiusiana is not strongly associated with a severe population bottleneck.

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Section: Methodsmentioning

confidence: 99%