The Origins of the Apple in Central Asia.

The study of agricultural origins has been revolutionized by genomic science. Whole genome sequencing of plant domesticates opens a door to multiple new approaches by which the timing, nature, and geography of human selective pressures on the evolution of domesticated species might be detected. These new scientific pathways greatly enhance understandings of domestication as an evolutionary process, but they also renew long-standing questions for archaeologists about whether and how to perceive human agency in the ancient past of human–plant interspecies relations. Due to its importance as a global commercial crop, the apple (Malus x domestica Borkh.) was the tenth plant genome to be successfully sequenced in 2010. The genomic record of the apple reveals a deep history of human–plant co-evolution by unconscious selection, domestication through hybridization, and a phylogeographic origin in Central Asia. The first two of these insights document a domesticate that has evolved from protracted and unconscious processes, but the third—the identification of the progenitor Malus sieversii (Ledeb.) M. Roem. in Central Asia, and the necessary corollary that its hybridization arose along the 'Silk Road'—invites further discussion about the roles of human agency and intentionality in the initial stages of plant domestication. This paper presents a review of apple domestication studies in archaeology and genetics and considers the problematic of Central Asia and the Silk Road in the current paradigm shift of agricultural origins research. [ABSTRACT FROM AUTHOR]