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

in HortScience
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  • 1 The Hebrew University of Jerusalem, The Robert Smith Institute for Plant Sciences and Genetics in Agriculture, P.O. Box 12, Rehovot, 76100 Israel

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 transferred 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.

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