Development of an efficient seed dormancy breaking method for African rice (Oryza glaberrima)
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Université Nationale des Sciences, Technologies, Ingénierie et Mathématiques (UNSTIM), Abomey, Benin
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Seed dormancy is a significant factor limiting the conservation, evaluation, distribution and utilisation of African
cultivated rice, Oryza glaberrima. In this study, 20 accessions from the AfricaRice genebank were grown at
the AfricaRice Mbé station in Côte d’Ivoire, harvested manually, dried at 15% RH and 15°C, and stored at
-20°C for one month before use. Seeds underwent dry heat treatment at 50 or 60°C for 2, 4, 7, 14, 21 or 28
days, or were treated with: 0.5, 1, 1.5 or 2 M KCl; 0.022, 0.112, 0.224 or 0.448 M HNO3; 0.05, 0.1, 0.2, 0.4,
or 0.5 M KH2PO4; and 2.89, 5.77 or 14.44 mM gibberellic acid (GA3). Most treatments on intact seeds did not
significantly increase germination, except for those treated at 50°C for 21 or 28 days. Dehulled seeds germinated
effectively with all treatments except HNO3 solutions. After validating the treatment on 287 O. glaberrima
accessions, it was concluded that dry heat treatment at 50°C for 28 days effectively breaks dormancy. This
protocol improves germination percentages of O. glaberrima, enhancing its use in various studies and aiding
better decision-making in the management of O. glaberrima accessions in genebanks
Palabras clave
rice, seed