Genetic Differentiation of Budburst Timing in Fagus crenata Populations along a Spatial Gradient in Late Frost Timing in the Hakkoda Mountains, Northern Japan
Genetic Differentiation of Budburst Timing in Fagus crenata Populations along a Spatial Gradient in Late Frost Timing in the Hakkoda Mountains, Northern Japan
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DOI：
10.3390/f14040659
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发表时间：
2023-03
期刊：
影响因子：
2.9
通讯作者：
Saki Sugimoto;K. Ishida
中科院分区：
文献类型：
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作者：
Saki Sugimoto;K. Ishida
以上一次霜冻日和地形为研究对象，研究了日本北部Hakkoda山区Fagus crenata种群在晚霜时序空间梯度上的萌发时序遗传分化。对于萌发时间，我们分析了栖息地的种群间变异，苗圃的遗传变异，以及这些变异与栖息地环境条件之间的关系。种群间变异分析表明，冬虫夏草幼虫萌发的日数和积温与上一次霜冻致死日呈正相关。遗传变异分析表明，这两个性状在种源和家系间均存在显著的遗传差异。所有种源的遗传力均在0.7~0.8之间。各种源间的遗传变异与最后一个霜冻日的变异显著相关，表明晚霜的自然选择导致了晚霜时间沿空间梯度的遗传分化。这些结果表明，晚霜是驱动区域树木种群内落叶物候遗传分化的关键因素。
We studied the genetic differentiation in budburst timing among Fagus crenata populations along spatial gradients in late frost timing in the Hakkoda Mountains, northern Japan, by focusing on last fatal frost day and topography. For budburst timing, we analyzed interpopulation variations in habitats, genetic variations in a nursery, and the relationships between these variations and environmental conditions in the habitats. Analyses of interpopulation variation showed that the day and the temperature sum of budburst positively correlated with the last fatal frost day in the habitats. Analyses of genetic variation showed significant genetic variations among provenances and families for both traits. For all provenances, the heritability for these traits were 0.7–0.8. The genetic variations were significantly associated with variations in the last fatal frost day among the provenances, suggesting that natural selection due to late fatal frost causes genetic differentiation in the traits along the spatial gradient in late frost timing. These results demonstrate that late frost is a key factor driving genetic differentiation of leaf-out phenology within a regional tree population.