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The effect of low-temperature (LT) storage at 10 °C on dormancy relaxation and budbreak was studied in tubers of colored Zantedeschia. LT storage for 35 or 64 days enhanced budbreak by about 80 days compared to tubers stored at 20 °C. Primary bud elongation did not occur at 10 °C for 143 days, but took place after the tubers were trans- ferred to 20 °C. Prolonged LT storage enhanced the rate of bud elongation at 20 °C. It is proposed that LT storage enhances dormancy relaxation but, at the same time, inhibits bud elongation in nondormant buds. This dual effect can serve growers in programmed production of year-round forcing of colored calla lily flowers. The rising demand for tubers and flow- ers of colored Zantedeschia throughout the year is leading to a gradual increase in the production and planting of tubers out of the growing season. The outcome of this trend is the irregular and delayed tuber sprouting fre- quently observed in the field (Funnell, 1993). This unreliable tuber behavior is probably due to the variation in tuber dormancy. Species of colored Zantedeschia are perennial tuberous geophytes characterized by alternating growth and rest periods (Funnell, 1993). Their tubers usually posses a dominant primary bud (i.e., largest, first sprouting bud), encircled by

Control of Bud Sprouting and Elongation in Colored Zantedeschia Tubers by Low-temperature Storage