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To browse Academia. Poor germination in Rosa has been an obstacle to breeding programs for years. This experiment used 9 genotypes and compared these two approaches combined with variations in the stratification media sand, perlite, sphagnum moss and Sunshine Mix 4. Sunshine Mix 4 gave the best germination as compared to all other media types tested.
As expected the germ Masum Akond, Ph. Sevket Alp. David Byrne. Poor germination in Rosa spp. Several methods exist to increase germination of rose seed. Unfortunately no consensus exists on the best method, or if any one method is best for all rose types. Rose seeds from a R. Seeds were leached at room temperature with tap water for a period of 0, 3, 7, or 14 days. Constant filtration and aeration were supplied.
After leaching, seeds were placed on either moist milled sphagnum moss or agar. Individual seedlings were planted when a root was visible. The combination of no leaching plus the moist milled sphagnum moss treatment significantly increased germination over leaching for 3 or more days and agar. Global Science Books. Most rose achenes are dormant at maturity and require pretreatment to stimulate germination. Achene morphology and imbibition also were investigated to help determine the class of dormancy.
Freshly harvested R. The embryo was fully developed, and the pericarp was permeable. Thus, the achenes did not have physical, morphological, or morphophysiological dormancy. Mechanical and acid scarification significantly increased germination percentage and rate. Germination percentage increased with an increase in duration of soaking in H 2 SO 4 , reaching the highest value after 2 h and then decreasing, while germination rate increased continuously with increased time of acid scarification.