HomeInternational Rice Research Notesvol. 23 no. 1 (1998)

Four promising medium-duration upland rice breeding lines for the République Démocratique du Congo

B. Mateso | K. Kasongo | B. Lienge

Discipline: Agriculture, Genetics



Several upland rice varieties have been cultivated under upland (dryland) conditions, the main rice ecosystem for RDC. Ry1 (IRAT2) is a 140-cm-high, medium-duration (120 d), blast-resistant, and lodging-tolerant variety. It was selected especially for grain yield (averaging 3.2 t ha-1) and for yield stability across locations where tested. It was released in 1982 to replace R66, an old cultivar yielding 2.5 t ha-1. But because RY1 rice is sticky when cooked, the cooking process is more difficult for consumers, who prefer cooked rice that is harder, flakier (not sticky), whiter, and denser in appearance and that remains soft even when stored overnight. This behavior of RY1 rice after cooking could be attributed to its low amylose content (15.6%), which has resulted in poor acceptance of RY1 by farmers.