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Nous avons irradié des graines de six obtentions de trois espèces de Roegneria avec le rayonnement gamma du 60Co, à différentes doses (50, 100, 150, 200, 250, 300 et 400 Gy). Suite à ces traitements, nous avons étudié l’énergie de germination, la vitesse de germination, la hauteur des semis, la hauteur des plants, le taux de survie des plants et la grenaison.
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Seeds from six accessions of three species of Roegneria were radiated with 60Co γ-ray at different doses (50, 100, 150, 200, 250, 300 and 400 Gy). Following these treatments, germination energy, germination rate, seedling height, plant height, plant survival, and seed set were observed. Plant survival was highly correlated with seedling height (R 2 > 0.91, P < 0.01) and seed set (R 2 > 0.82, P < 0.01). The semi-lethal dose of each accession, calculated using a ‘Multi-target single-hit’ model, ranged from 60 to 173 Gy. The most suitable absorbed doses for each accession were deduced from these data. The suitable doses for Roegneria kamoji, Roegneria ciliaris and Roegneria japonensis were 65–100 Gy, 63–150 Gy and 80–170 Gy, respectively. According to the range of suitable doses, R. kamoji (Pr87-88-353) was the most sensitive to radiation, and R. japonensis (88-89-267) was the most resistant to radiation. Suitable doses of R. ciliaris were close to that of R. kamoji (ZY1007). This research provides preliminary guidelines for radiation induced mutagenesis in Roegneria.
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