ONION BREEDING IN SOUTH AFRICA
In 1947, a breeding programme for short-day onions and in 1972 a breeding programme for intermediate-day onions were initiated at the Vegetable and Ornamental Plant Institute (VOPI). The most important cultivars released from the breeding programme are the open-pollinated short-day cultivars, Pyramid (1968), Bon Accord (1968), and Radium (1987) and the open-pollinated intermediate-day cultivars, Roël (1987), Rion-1, Rion-2, Rion-3, and Rion-4 (all in 1992). In 1980, the breeding of male-sterile and maintainer lines for both daylengths was initiated. Since then several well-adapted male-sterile and maintainer lines for both daylengths were developed. Currently, breeding for disease resistance is also incorporated into the breeding programme.
Bester, C. and van Zijl, J.J.B. (1994). ONION BREEDING IN SOUTH AFRICA. Acta Hortic. 358, 191-194