Origin of extant domesticated sunflowers in eastern North America
Origin of extant domesticated sunflowers in eastern North America
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DOI：
10.1038/nature02710
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发表时间：
2004-07-08
期刊：
影响因子：
64.8
通讯作者：
Rieseberg, LH
中科院分区：
文献类型：
--
作者：
Harter, AV;Gardner, KA;Rieseberg, LH
北美东部是世界上至少六个农业被认为完全独立兴起的地区之一(1-5)。这一假设的主要证据来自于三种重要作物——南瓜、藜和向日葵——以及一种已灭绝的次要栽培种——黄草的考古植物学记录的形态变化(1,3)。然而，三种主要驯化植物中的两种——南瓜和藜——的地理起源目前存在争议(6,7)，并且直到最近，向日葵（Helianthus annuus L.）还被认为是北美东部唯一无可争议的驯化植物。在塔巴斯科州圣安德烈斯 (8,9) 发现了 4,000 年前的驯化向日葵遗骸，这意味着墨西哥存在更早且可能独立的驯化起源，并促使人们重新审视驯化向日葵的地理起源。在这里，我们描述了现存驯化菌株与从美国和墨西哥各地收集的野生种群之间的遗传关系和遗传漂变模式。我们发现现存的驯化动物起源于北美东部，在驯化过程中出现了重大的遗传瓶颈(10)。
Eastern North America is one of at least six regions of the world where agriculture is thought to have arisen wholly independently(1-5). The primary evidence for this hypothesis derives from morphological changes in the archaeobotanical record of three important crops-squash, goosefoot and sunflower-as well as an extinct minor cultigen, sumpweed(1,3). However, the geographical origins of two of the three primary domesticates squash and goosefoot-are now debated(6,7), and until recently sunflower ( Helianthus annuus L.) has been considered the only undisputed eastern North American domesticate. The discovery of 4,000-year-old domesticated sunflower remains from San Andres, Tabasco(8,9), implies an earlier and possibly independent origin of domestication in Mexico and has stimulated a re-examination of the geographical origin of domesticated sunflower. Here we describe the genetic relationships and pattern of genetic drift between extant domesticated strains and wild populations collected from throughout the USA and Mexico. We show that extant domesticates arose in eastern North America, with a substantial genetic bottleneck(10) occurring during domestication.