Relationship between visually determined starch content and flowering of containerized field-grown garden roses
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Rose (Rosa sp.) cultivars Chrysler Imperial, Christian Dior, Garden Party, and Oregold were harvested bare-root on 18 November and 2 December 2002 from a commercial nursery in Arizona. Grade 1 plants were stored for either 0, 2, or 4 weeks at 2C and then were potted and forced to flowering in Tucson, Arizona and Tyler, Texas. At the time of digging and at the end of each storage period, representative plants were visually evaluated for starch content using stem cross sections stained with lugol solution. Starch ratings were similar across weeks of cold storage for the 18 November digging date, but declined with weeks of cold storage for some cultivars dug on 2 December. The number of flowering shoots was affected by cultivar, digging date and cold storage. Starch ratings of rose canes at the time of potting do not appear to be related to the number of flowering shoots or the time from potting to anthesis when bare-root plants are containerized and forced into flower.
