Abstract
Using Rosa multiflora var. adenochaeta, the effects of temperature on the germination of seeds (achenes) treated for 36 h with the macerating enzyme Driselase in 1% solution were studied. The germination was quickest at 20°C, coming later at 15°C, the final germination rate for both temperatures was approximately 75%. At 10°C germination was delayed, but the final germination rate was 82%. The germination was significantly delayed at 5°C, although the germination rate was 78% after 41 d. At 25°C germination began comparatively early, but the final germination rate was only 36%. The effects of temperature on the germination of seeds (achenes) treated with 1% Driselase for 48 h was studied using Rosa wichuraiana, ‘Carolina, ’‘Playboy’ and a variety of Rambler. The germination rate was between 5 and 25% at 10 to 20°C, little difference due to temperature was observed. No germination occurred at 5 and 25°C. We conclude that the optimum temperature for seed (achene) germination of Rosa spp. was 10 to 20°C. At 5°C germination was delayed but did occur if the duration was long enough. At 25°C germination appeared to be inhibited.
