Chemotaxonomy of domesticated grasses: a pathway to understanding the origins of agriculture
Chemotaxonomy of domesticated grasses: a pathway to understanding the origins of agriculture
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DOI：
10.5194/jm-38-83-2019
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发表时间：
2019-06-07
影响因子：
2
通讯作者：
Fraser, Wesley T.
中科院分区：
文献类型：
--
作者：
Jardine, Phillip E.;Gosling, William D.;Fraser, Wesley T.
禾本科是当今世界上最重要的经济植物类群之一。特别是许多主要的粮食作物，包括水稻、小麦、玉米、黑麦、大麦、燕麦和小米，都是在全新世期间从野生祖先驯化的草。考古证据提供了不同草系在时间和空间上驯化途径的关键信息。然而，最丰富的经验档案的花的变化-花粉记录-一直未充分用于重建草驯化模式，因为其形态的基础上单独的分类草花粉粒的挑战。在这里，我们测试了一种新的方法的花粉分类的基础上，使用傅里叶变换红外（FTIR）显微光谱测量的花粉粒的化学签名的潜力。我们使用八种驯化和野生草种的数据集，使用k-最近邻分类结合留一交叉验证进行分类。我们在训练数据上证明了95%的分类成功率，在验证数据上证明了82%的分类成功率。这一结果表明，FTIR光谱可以提供增强的分类分辨率，使花粉的物种水平分配。这将使通过全新世的驯化和农业的时间和驱动力的全面测试。
The grass family (Poaceae) is one of the most economically important plant groups in the world today. In particular many major food crops, including rice, wheat, maize, rye, barley, oats and millet, are grasses that were domesticated from wild progenitors during the Holocene. Archaeological evidence has provided key information on domestication pathways of different grass lineages through time and space. However, the most abundant empirical archive of floral change - the pollen record - has been underused for reconstructing grass domestication patterns because of the challenges of classifying grass pollen grains based on their morphology alone. Here, we test the potential of a novel approach for pollen classification based on the chemical signature of the pollen grains measured using Fourier transform infrared (FTIR) microspectroscopy. We use a dataset of eight domesticated and wild grass species, classified using k-nearest neighbour classification coupled with leave-one-out cross validation. We demonstrate a 95 % classification success rate on training data and an 82 % classification success rate on validation data. This result shows that FTIR spectroscopy can provide enhanced taxonomic resolution enabling species level assignment from pollen. This will enable the full testing of the timing and drivers of domestication and agriculture through the Holocene.