A forest of apples
The wild apple was already big before anyone planted one.
In the mountains of Central Asia, mostly in south-eastern Kazakhstan, grows a wild apple, Malus sieversii. It is the main ancestor of every apple in the shops.
Its fruit is not what a wild fruit is supposed to be. Some trees bear apples 7 or 8 cm across, larger than any other wild apple. Genome studies find that apple fruit grew in two steps, and that the first came before people. A stretch of DNA linked to bigger fruit was already common in the wild trees.
Why a wild tree should make so large a fruit is not known. One idea is that it fed big animals, which carried the seeds away. Nobody has yet shown which animals.
The botanist Nikolai Vavilov reached Alma-Ata, now Almaty, in 1929, at ripening time. He judged the forests around it a center of origin of the apple.
- 34 mm · 16 g
- Average wild fruit, 210 trees in the Ili valley
- 57 g
- Average wild fruit, a Canadian collection
- 72%
- Wild trees with sour or very sour fruit