Carrot (Daucus carota L.) is one of the most economically important root vegetables in the world, providing carotenoids and provitamin A to humans. Carrot belongs to the Daucus in the family Apiaceae. The majority of cultivated carrots are functional diploids (2n = 18) with a genome size of about 480 Mb. At present, around 100 countries grow carrots, with China being the world's largest carrot-producing country, accounting for half of worldwide. According to the Food and Agriculture Organization of the United Nations, over 20 million tons of carrots are produced every year on about one million hectares.
The ancestors of cultivated carrot may have originated from central Asia (Iran and Afghanistan). As a vegetable crop, the history of carrot was about 1100 years in Afghanistan. The nutritional quality and yield of carrot were improved by selective breeding over the centuries.