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首页> 外文期刊>Annals of Botany >Window of opportunity: an episode of recruitment in a Banksia hybrid zone demonstrates continuing hybridization and phenotypic plasticity.
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Window of opportunity: an episode of recruitment in a Banksia hybrid zone demonstrates continuing hybridization and phenotypic plasticity.

机译：机会之窗：在Banksia杂交区的一次募集活动显示出持续的杂交和表型可塑性。

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BACKGROUND AND AIMS: In perennial plants (especially post-fire resprouters), extant populations may reflect recruitment events in the distant past. This is true of hybrid zones formed by two Banksia species of swamps and woodlands in south-eastern Australia, Banksia robur and B. oblongifolia. Both resprout after fire but recruitment is dependent on periodic fires. Although plants of intermediate morphology have also been identified as hybrids using allozyme markers, the extent of ongoing hybridization is unknown. This study investigates whether both microsatellite markers and morphological measurements can be used to distinguish between the two species and their hybrids. A recent recruitment event and microsatellite markers allow the frequency of ongoing hybridization to be estimated, and also the effects of environmental variation on the morphology of plants and seedlings to be tested. METHODS: Variation at seven microsatellite loci was scored and seven leaf characteristics within putatively pure stands and mixed stands of both species were measured, revealing that the two species were genetically and morphologically distinct and that mixed stands also contained genetically and sometimes morphologically distinct hybrids. An opportunity created by wildfires was used to analyse the genetics and morphometrics of adults and seedlings from two hybrid zones. KEY RESULTS: Approximately 9 % of adults and 21 % of seedlings were identified as genetic hybrids in both hybrid zones. Within these sites, the genotype of mature plants correlated well with morphology, except for some hybrid plants that had parental morphology. However, seedling morphology was highly variable and insufficient to describe the composition of the hybrid zone in this cohort. Greater phenotypic plasticity was evident among seedlings growing within the hybrid zones than seedlings growing in pots. CONCLUSIONS: The hybrid zones are complex and the range of genotypes detected in seedlings reveals both continuing hybridization and introgression.
机译：背景与目的：在多年生植物（尤其是火灾后的繁殖体）中，现存种群可能反映了遥远过去的募集事件。由澳大利亚东南部的两个班克西亚种沼泽和林地形成的混合地带确实如此，班克西亚罗伯和长双歧杆菌。双方都在大火后重新萌芽，但招募取决于定期大火。尽管使用同工酶标记也已将中等形态的植物鉴定为杂种，但仍未确定杂交的程度。这项研究调查了是否可以同时使用微卫星标记和形态学测量来区分两个物种及其杂种。最近的募集事件和微卫星标记可以估计正在进行的杂交的频率，以及环境变化对待测植物和幼苗形态的影响。方法：对两个物种的七个微卫星位点进行了评分，并测量了两个物种的纯正林分和混交林中的七个叶片特征，表明这两个物种在遗传和形态上是不同的，并且混合林还包含遗传上和形态上不同的杂种。野火创造的机会被用于分析两个杂种区的成年和幼苗的遗传和形态学。关键结果：在两个杂种区中，大约有9％的成年人和21％的幼苗被确定为遗传杂种。在这些位点内，除了一些具有亲本形态的杂种植物外，成熟植物的基因型与形态之间具有很好的相关性。但是，幼苗的形态变化很大，不足以描述该队列中杂交区的组成。在杂交区内生长的幼苗比在盆中生长的幼苗具有更大的表型可塑性。结论：杂种区很复杂，在幼苗中检测到的基因型范围揭示了持续的杂交和渗入。

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