Spengler Robert Nicholas
Paleoethnobotany Laboratories, Department of Archaeology, Max Planck Institute for the Science of Human History, Jena, Germany.
Front Plant Sci. 2019 May 27;10:617. doi: 10.3389/fpls.2019.00617. eCollection 2019.
The apple ( [Suckow] Borkh.) is one of the most economically and culturally significant fruits in the world today, and it is grown in all temperate zones. With over a thousand landraces recognized, the modern apple provides a unique case study for understanding plant evolution under human cultivation. Recent genomic and archaeobotanical studies have illuminated parts of the process of domestication in the Rosaceae family. Interestingly, these data seem to suggest that rosaceous arboreal crops did not follow the same pathway toward domestication as other domesticated, especially annual, plants. Unlike in cereal crops, tree domestication appears to have been rapid and driven by hybridization. Apple domestication also calls into question the concept of centers of domestication and human intentionality. Studies of arboreal domestication also illustrate the importance of fully understanding the seed dispersal processes in the wild progenitors when studying crop origins. Large fruits in Rosaceae evolved as a seed-dispersal adaptation recruiting megafaunal mammals of the late Miocene. Genetic studies illustrate that the increase in fruit size and changes in morphology during evolution in the wild resulted from hybridization events and were selected for by large seed dispersers. Humans over the past three millennia have fixed larger-fruiting hybrids through grafting and cloning. Ultimately, the process of evolution under human cultivation parallels the natural evolution of larger fruits in the clade as an adaptive strategy, which resulted in mutualism with large mammalian seed dispersers (disperser recruitment).
苹果([苏科] 博尔克)是当今世界上经济和文化意义最为重大的水果之一,种植于所有温带地区。现代苹果已识别出一千多个地方品种,为理解人类栽培下的植物进化提供了独特的案例研究。近期的基因组学和考古植物学研究揭示了蔷薇科植物驯化过程的部分情况。有趣的是,这些数据似乎表明,蔷薇科木本作物的驯化路径与其他驯化植物,尤其是一年生植物不同。与谷类作物不同,树木的驯化似乎很迅速,且是由杂交驱动的。苹果的驯化也对驯化中心和人类意图的概念提出了质疑。对木本植物驯化的研究还表明,在研究作物起源时,充分了解野生祖先的种子传播过程非常重要。蔷薇科的大果实是作为一种种子传播适应方式进化而来的,它吸引了中新世晚期的大型食草哺乳动物。遗传学研究表明,野生状态下进化过程中果实大小的增加和形态变化是由杂交事件导致的,并被大型种子传播者所选择。在过去三千年里,人类通过嫁接和克隆固定了更大果实的杂交品种。最终,人类栽培下的进化过程与该分支中更大果实的自然进化过程类似,都是一种适应性策略,这导致了与大型哺乳动物种子传播者的共生关系(传播者招募)。