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- W69851911 abstract "SD = short day. Splitting is a physiological flowering disorder of poinsettia (Euphorbia pulcherrima Willd. ex Kl.) in which the vegetative shoot tip becomes reproductive under long-day (LD; noninductive) photoperiods (Tayama et al., 1982). Vegetative axillary shoots, usually three, develop around the apical flower bud. This results in the splitting of the main stem into three, which destroys the desired singlestemmed habit of the plants. Splitting can occur any time during the production cycle, affecting stock plants or cuttings. The severity of splitting varies from year to year, and even within a greenhouse. Working with ‘Paul Mikkelsen’, Kofranek and Hackett (1965; Hackett and Kofranek, 1971) found that maintaining plants under long days (16 hr) and cool nights (15C) did not reduce splitting. Raising the night temperature to 25C with LD conditions, however, did reduce splitting. They also found that 100% splitting occurred after exposure to 3 short days (SD) followed by LD at 21C (Hackett and Kofranek, 1971). Struckmeyer and Beck (1960), working with the cultivar ‘Ruth Ecke’ (night temperatures not given), reported that splitting was induced by subjecting plants to 8 SD followed by 30 LD. We evaluated splitting in ‘Annette Hegg Dark Red’ poinsettia, a cultivar susceptible to this phenomenon, by determining 1) the minimum number of SD required to induce splitting, and 2) the number of leaves formed and the length of time from the start of SD treatment until a flower bud was visible. Physiologically and genetically uniform rooted cuttings were obtained and grown under LD. Plants were severely pruned three times in succession, each time allowing only one axillary bud to remain per shoot. Cuttings from axillary shoots arising from the third pruning that were similar in age, length, and size were harvested for our experiments. Short days required for splitting. Cuttings were rooted and planted in 475-cm pots and maintained under noninductive conditions for" @default.
- W69851911 created "2016-06-24" @default.
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- W69851911 date "1990-12-01" @default.
- W69851911 modified "2023-09-27" @default.
- W69851911 title "Short-day Photoperiod Duration Influences Splitting of Poinsettia" @default.
- W69851911 cites W199515930 @default.
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- W69851911 doi "https://doi.org/10.21273/hortsci.25.12.1663" @default.
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