Inter-population variability in seed mass and germination of two important grasses of the Arabian Desert: Panicum turgidum Forssk and Pennisetum divisum (Forssk. ex J.F. Gmel.)

BHATT, A; BHAT, N.R; AL-NASSER. A; CARON M. M.; SANTO, A.

Journal of Arid Land

springer

Año: 2019

1674-6767

Understanding variabilityin seed germination among populations is essential for planning an effective germplasmcollection for restoration and conservation purposes. The knowledge of germination and dormancy patterns among the populations of desertgrasses is crucial for determining the potential of the species and populationsto be used for restoration and conservation actions as well as forageproduction. Variability in seed germination of Panicum turgidum and Pennisetumdivisum in Arabian Desert was evaluated using seeds collected fromdifferent locations. Percent germination was evaluated for each population ofeach species using 25 seeds in four replicates at night/day temperature of15°C/20°C and 20°C/30°C under two light conditions: continuous darkness or 12h/12 h light/dark. Seed weight and germination rate varied considerably amongpopulations. The variation in germination percentage was greater in P.turgidum (17% to 49%) as compared to that in P. divisum (72% to93%). P. turgidum germination percentage was greater at a highertemperature (20°C/30°C) as compared to that under lower temperature regimes(15°C/20°C). Conversely, temperature regimes had no effect on germination rateof P. divisum seeds. The germination percentage and the mean germinationtime of both species exhibited significant inter-population variabilities.This information is especially relevant to assure the regeneration success andto increase the productivity through the selection of the best populations ofeach species. Besides this, inter-population variability also provides valuableinformation that could enhance our understanding of the mechanisms thatregulate germination and how they might be related to the seed provenance.