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首页> 外文期刊>Global Ecology and Conservation >Genetic differentiation in leaf phenology among natural populations of Adansonia digitata L. follows climatic clines
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Genetic differentiation in leaf phenology among natural populations of Adansonia digitata L. follows climatic clines

机译：赤潮后自然种群种群叶片物候学的遗传分化

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Leafing phenology is an important component of climatic adaptation in semi-arid regions. The questions are to what extent phenology is under genetic control and represent adaptation to local climates? In the present study, we compare leaf phenology among Adansonia digitata L. trees of 27 different origins from West and East Africa and test if the differences follow climatic clines. Timing of bud burst was largely synchronized with the start of rainy season, but some few individual trees showed bud burst before the first rain. Timing of leaf senescence was under genetic control with substantial differences among origins. The timing of senescence was for some origins at the end of rainy season and for some in the beginning of the dry season. Differences among origins in timing of leaf senescence were related to the variation in drought just before- and in the first months of the rainy season at the sites of origin. Populations from drier sites had the earliest leaf shed at the common test site indicating that trees have been adapted to the prevailing climatic conditions at the sites of origin. We discuss the results in the light of possible triggering factors.
机译：在半干旱地区，叶子物候学是气候适应的重要组成部分。问题是物候学在多大程度上受基因控制并代表着对当地气候的适应？在本研究中，我们比较了来自西非和东非的27种不同起源的刺五加树的叶子物候，并测试了差异是否遵循气候变化规律。芽萌发的时间与雨季的开始基本同步，但是一些树木在第一场降雨之前就已经萌芽了。叶片衰老的时机受遗传控制，起源之间存在实质性差异。衰老的时机是在雨季结束时和干旱季节开始时的某些起源。叶片衰老时机的起源之间的差异与起源地雨季前后的干旱变化有关。来自较干燥地点的种群最早在共同的试验地点脱落了叶，这表明树木已经适应了原始地点的主要气候条件。我们根据可能的触发因素来讨论结果。

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