Repeated genetic and adaptive phenotypic divergence across tidal elevation in a foundation plant species
Repeated genetic and adaptive phenotypic divergence across tidal elevation in a foundation plant species
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基础植物物种在潮汐海拔范围内重复的遗传和适应性表型分歧
DOI：
10.1086/716512
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Hughes, Dr. A
中科院分区：
文献类型：
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作者：
Zerebecki, Robyn;Sotka, Dr. Erik;Hanley, Dr. Torrance;Bell, Dr. Katherine;Gehring, Dr. Catherine;Nice, Dr. Chris;Richards, Dr. Christina;Hughes, Dr. A
微地理遗传分化可以产生精细尺度的性状变异。当这种分化发生在基础物种内部时，可能会影响群落结构和生态系统功能，并引起其他级联生态效应。我们测试了互花米草（Spartina alterniflora）的平行微地理特征和遗传分化，互花米草是美国大西洋和海湾海岸盐沼的基础种。（<0.5 m）在较高潮汐高度的植物，然而，这种性状变异是否反映了对这些环境条件的可塑性和/或遗传差异反应仍不清楚。在温室中，从高型植物培育的幼苗比从矮型植物培育的幼苗长得高，这表明高度的差异是可遗传的。当我们将幼苗移植回田间生长季节时，复合适合度（存活率和种子产量）和关键植物性状（株高和生物量分配）在原产地和移植区之间以指示当地适应的方式相互作用。此外，单核苷酸多态性的调查显示，重复的，独立的遗传分化之间的高和短的formSpartinaat五个测试沼泽整个原生范围。在Spartinalikely观察到的平行的微地理遗传分化支撑着沼泽的健康和功能，并提供了一种未被充分认识的机制，可能会增加沼泽适应海平面上升的能力。
Microgeographic genetic divergence can create fine-scale trait variation. When such divergence occurs within foundation species, then it might impact community structure and ecosystem function and cause other cascading ecological effects. We tested for parallel microgeographic trait and genetic divergence inSpartina alterniflora, a foundation species that dominates salt marshes of the US Atlantic and Gulf coasts.Spartinais characterized by tall-form (1–2 m) plants at lower tidal elevations and short-form (<0.5 m) plants at higher tidal elevations, yet whether this trait variation reflects plastic and/or genetically differentiated responses to these environmental conditions remains unclear. In the greenhouse, seedlings raised from tall-form plants grew taller than those from short-form plants, indicating a heritable difference in height. When we reciprocally transplanted seedlings back into the field for a growing season, composite fitness (survivorship and seed production) and key plant traits (plant height and biomass allocation) differed interactively across origin and transplant zones in a manner indicative of local adaptation. Further, a survey of single nucleotide polymorphisms revealed repeated, independent genetic differentiation between tall- and short-formSpartinaat five of six tested marshes across the native range. The observed parallel, microgeographic genetic differentiation inSpartinalikely underpins marsh health and functioning and provides an underappreciated mechanism that might increase capacity of marshes to adapt to rising sea levels.