The Genesis of Plant Domestication

Key Insight

Plant domestication, defined as growing plants to genetically modify them for human use, predates modern scientific efforts by over 10000 years. Early farmers, unlike today's specialized scientists with genetic knowledge, began this process unwittingly, even with crops like almonds whose wild progenitors were lethal or unpalatable, containing enough cyanide in a few dozen to be fatal. The mystery lies in how ancient people, without understanding genetics or having crop models, transformed wild, often poisonous plants into safe and useful food sources.

The initial stages of domestication were often an unconscious consequence of humans interacting with wild plants, akin to how animals disperse seeds. Many plants rely on animals to carry their seeds by enclosing them in tasty fruits that signal ripeness via color or smell; the animal eats the fruit and disperses the indigestible seeds. Similarly, early humans, by eating and moving wild plants, inadvertently created 'agricultural research laboratories' through discarded seeds in latrines, spittoons, and garbage dumps, which served as testing grounds for the first crop breeders.

In these informal 'labs,' seeds from preferred individual plants were more likely to be discarded and grow. Even before intentional sowing, hunter-gatherers unconsciously selected plants based on immediately noticeable criteria like size and taste. For example, large berries were favored over small ones, leading to crops like cultivated peas becoming 10 times heavier than wild ones, and supermarket apples being 3 inches in diameter compared to wild 1-inch apples. The domestication of almonds by 3000 B.C. from bitter wild ancestors in the eastern Mediterranean illustrates selection for rare nonbitter mutations that early farmers recognized and propagated, following their discovery in archaeological sites in Greece by 8000 B.C.