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首页> 外文期刊>Systematic Botany >Breeding Relationships in Macaronesian Tolpis (Asteraceae-Cichorieae): F-1 Hybrid Pollen Fertility Within and Among Populations from the Azores, Canary Islands, and Madeira
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Breeding Relationships in Macaronesian Tolpis (Asteraceae-Cichorieae): F-1 Hybrid Pollen Fertility Within and Among Populations from the Azores, Canary Islands, and Madeira

机译：Macaronesian Tolpis（Asteraceae-Cichorieae）中的育种关系：亚速尔群岛，加那利群岛和马德拉岛的血液杂交花粉生育

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摘要

The pollen fertility of F-1 hybrids, ranging from progeny within natural populations to synthetic hybrids between species of Tolpis from three archipelagos in Macaronesia, was determined. Pollen fertility of F-1 hybrids of inter-archipelago crosses from the Azores, Canaries, and Madeira were generally lower than crosses between populations or species in the same archipelagos. Lower pollen fertility was pronounced in hybrids between plants from the Canaries and the other archipelagos, which is concordant with a more distant phylogenetic relationship between the Canaries, and the Azores and Madeira. Lower average pollen fertility was seen between plants from different as compared to the same clades in the Canary Islands. However, low pollen fertilities were also detected between plants from some populations/species in the same archipelagos, and even among progeny of individual maternal plants. Some hybrids with reduced fertility had meiotic irregularities, suggesting chromosomal rearrangements; in other cases meiosis appeared normal. Results indicate that postzygotic isolating factors evolved subsequent to the divergence of Tolpis in the three archipelagos, but there are hybrid sterility factors among plants within each of the archipelagos, and even within some natural populations. Phylogenetic relationships in the Canary Islands indicate that divergence has occurred within the last million years. Present results implicate postzygotic factors as reproductive barriers facilitating population divergence and speciation in Macaronesian Tolpis.
机译：确定了F-1杂交种的花粉生育率，从Macaronesia中三个群岛的三种群体之间对托帕内氏虫草之间的自然群体中的自然群体中的合成杂种。来自亚速尔群岛，大理石和马德拉的群岛间群岛的F-1杂交种的花粉生育率通常低于同一群岛中群体或物种之间的交叉。较低的花粉生育能力在植物和其他群岛之间的植物之间发出杂交种，这在大公司之间具有更远的系统发育关系和亚塞尔和马德拉。与加那利群岛的相同植物相比，植物之间看到植物之间的平均花粉生育率降低。然而，在同一群岛中的一些种群/物种之间的植物之间也检测到低花粉威胁，甚至在单个母体植物的后代。一些减少生育能力的杂交种具有肉芙兰违规行为，表明染色体重排;在其他情况下，MeIosis出现了正常。结果表明，在三个群岛中托的脱落后，ProDigoctic隔离因子在托管中发散，但群体中的植物中存在杂种无菌因子，甚至在某些天然群体中。加那利群岛的系统发育关系表明，近百万年内发生了分歧。目前的结果暗示Prodzygotic因子作为促进Macaronesian Tolpis中种群分歧和物种的生殖障碍。

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