| Popis: |
The effect of temperature on the time of bud-break and on the number of sprouted buds was studied in F1-seedling populations of glasshouse rose cultivars, which were grown in full daylight at 4 controlled temperatures (10, 14, 18 or 22°C). At lower temperatures, anthesis and bud-break occurred later. Relative to anthesis, bud-break occurred earlier with lower temperatures. Temperature had no effect on the percentage of buds sprouted, on the axillary position at which sprouting occurred, or on the order of sprouting. However, axillary buds in the central part of the seedling shoot were strongly inhibited; lower and upper buds sprouted almost simultaneously. Selection for time of sprouting and number of sprouted buds may be carried out at any temperature in the range studied. Differences in axillary bud-break between seedlings and cultivars, and the consequences for selection, are discussed. |
