The Domestication of the Amazon Tree Grape (Pourouma cecropiifolia) Under an Ecological Lens.
The Domestication of the Amazon Tree Grape (Pourouma cecropiifolia) Under an Ecological Lens.
复制标题
DOI：
10.3389/fpls.2018.00203
复制
发表时间：
2018
影响因子：
5.6
通讯作者：
Schietti J
中科院分区：
文献类型：
--
作者：
Pedrosa HC;Clement CR;Schietti J
驯化研究传统上侧重于直接选择下的野生和驯化种群之间形态特征的差异，即驯化综合症的组成部分。在这里，我们认为由于植物特征和自然选择力量之间的相互依赖，其他方面可以进行修改。我们使用传统和生态方法调查了亚马逊西部提库纳人培育的天蚕种群的持续驯化情况。我们比较了野生和驯化种群之间的果实特征，以量化驯化的直接影响。为了研究非直接选择的特征以及人类选择和自然选择的相关影响，我们研究了营养特征的差异、种子：果实异速关系的变化以及这些特征与环境条件变化的关系，并在主成分分析中总结。正如水果作物所预期的那样，驯化使果实特性发生了巨大变化。驯化植物的果实质量是野生果实的 20 倍，可食用果肉是野生果实的两倍。驯化种群的株高：胸径比和木材密度分别小 42% 和 22%，可能是由于栽培景观的光度更高和沙含量更高。种子：果实异速生长通过驯化进行了修改：虽然驯化植物的种子较重，但与野生果实相比，驯化果实的种子质量按比例（46％）较小。耕地的高光利用率和贫瘠的土壤可能导致种子质量减少，而人类选择促进了种子质量的增加，与果实质量的增加相关。这些对比效应导致驯化植物种子质量的增加比例较小。在这项研究中，不可能将形态特征变化中的环境影响与驯化影响明确区分开来，因为环境条件受到人类管理的强烈改变，这表明植物驯化与景观驯化有着内在的联系。我们的结果表明，对环境条件的评估以及人类对驯化表型的选择可以更好地理解植物驯化所产生的变化。
Domestication studies traditionally focus on the differences in morphological characteristics between wild and domesticated populations that are under direct selection, the components of the domestication syndrome. Here, we consider that other aspects can be modified, because of the interdependence between plant characteristics and the forces of natural selection. We investigated the ongoing domestication of Pourouma cecropiifolia populations cultivated by the Ticuna people in Western Amazonia, using traditional and ecological approaches. We compared fruit characteristics between wild and domesticated populations to quantify the direct effects of domestication. To examine the characteristics that are not under direct selection and the correlated effects of human selection and natural selection, we investigated the differences in vegetative characteristics, changes in seed:fruit allometric relations and the relations of these characteristics with variation in environmental conditions summarized in a principal component analysis. Domestication generated great changes in fruit characteristics, as expected in fruit crops. The fruits of domesticated plants had 20× greater mass and twice as much edible pulp as wild fruits. The plant height:DBH ratio and wood density were, respectively, 42% and 22% smaller in domesticated populations, probably in response to greater luminosity and higher sand content of the cultivated landscapes. Seed:fruit allometry was modified by domestication: although domesticated plants have heavier seeds, the domesticated fruits have proportionally (46%) smaller seed mass compared to wild fruits. The high light availability and poor soils of cultivated landscapes may have contributed to seed mass reduction, while human selection promoted seed mass increase in correlation with fruit mass increase. These contrasting effects generated a proportionately smaller increase in seed mass in domesticated plants. In this study, it was not possible to clearly dissociate the environmental effects from the domestication effects in changes in morphological characteristics, because the environmental conditions were intensively modified by human management, showing that plant domestication is intrinsically related to landscape domestication. Our results suggest that evaluation of environmental conditions together with human selection on domesticated phenotypes provide a better understanding of the changes generated by domestication in plants.
登录
查看更多内容
影响因子：
4.8
作者：
HAMMOND, DS;BROWN, VK
通讯作者：
BROWN, VK
影响因子：
2.6
作者：
Clement, CR
通讯作者：
Clement, CR
影响因子：
3
作者：
Chen, Hong;Felker, Sara;Sun, Shucun
通讯作者：
Sun, Shucun
影响因子：
3.8
作者：
Kleyer, Michael;Minden, Vanessa
通讯作者：
Minden, Vanessa
影响因子：
2.2
作者：
Dawson, Ian K.;Hollingsworth, Peter M.;Pennington, R. Toby
通讯作者：
Pennington, R. Toby