| Abstrakt: |
In the framework of the evaluation, valorization and conservation of plant genetic resources, six natural populations belonging to two species of forage grasses, perennial ryegrass (Lolium perenne L.) and annual ryegrass (Lolium rigidum Gaud.) collected in different agro-ecological regions of Algeria, were used to assess the effects of four NaCl and Na2SO4 concentrations (0, 50, 100, 150 mM) on germination parameters: germination percentage (GP), germination rate index (GRI), mean germination time (MGT), salt tolerance index (STI), seedling vigor index (SVI), shoot and root length. Seeds were germinated in an incubator at 20°C for 12 days in a completely randomized design with five replicates. The results revealed significant effects of NaCl and Na2SO4, populations and their interactions on germination parameters. Salinity reduced GP, STI, VI, GRI, shoot and root length, but increased MGT, in contrast to control experiment (0 mM). An important decrease was globally observed in the two species in all parameters with the lowest values at 100 and 150 mM except MGT. Compared to NaCl, the decrease was more important under Na2SO4. Population LP1 of L. perenne and the three populations of L. rigidum in the control and in the two salts showed the highest means of GP, GRI and SVI. Populations LR3 of L. rigidum (arid area) and LP3 of L. perenne (sub humid area) were the most sensitive at 150 mM. The shorter MGT was obtained in population LP1 of L. perenne which seems to be more salt-tolerant toward the two salts than the annual L. rigidum. [ABSTRACT FROM AUTHOR] |
