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Three lisianthus [Eustoma grandiflorum (Raf.) Shinn.] cultivars 0, 10, 17, 24, or 31 days from sowing were grown in 28C soil for 0, 7, 14, 21, or 28 days to determine the effects of high temperature during seedling growth on the development of rosetted plants. Increasing the duration of high-temperature exposure increased the percentage of rosetted plants for all cultivars. Such exposure for 28 days resulted in 96%, 93%, and 18% rosetted plants for cultivars Yodel White, Yodel Pink, and GCREC-Blue, respectively. Seedling age did not affect percentage of flowering `Yodel Pink' plants, but as seedling age increased to 31 days, the percentage of flowering plants increased with `GCREC-Blue' and decreased for `Yodel White'. In a second experiment, four lisianthus cultivars were grown at 22C for 3 weeks and then exposed for 28 days to soil at 22, 25, 28, or 31C. Increasing soil temperature resulted in more rosetted plants for all cultivars. With soil at 31C, 83%, 58%, 19%, and 2% of the seedlings rosetted for the cultivars USDA-Pink, Yodel White, Little Belle Blue, and GCREC-Blue, respectively.
The effects of watering frequency, bulb size, temperature, and Promalin on flowering of Cyrtanthus elatus, were investigated. Bulbs must be 8 cm, in circum., with minimum of 10 leaf bases before the first inflorescence will develop from a swollen leaf base. One inflorescence was initiated for each set of 5 leaf bases. Watering frequencies did not affect flower bud development and abortion. Greater than 73% of plants developing from bulbs larger than 15.3 cm in circum. produced an inflorescence with 4 to 6 flowers when grown at 26/23C (D/N) and sprayed with 3,000 ppm Promalin. Anthesis was accelerated from 64 days to 39 days when temperatures were increased from 16/13 to 26/23C. A second inflorescence was also produced from some Promalin-treated plants grown at 26/23C. Flower bud abortion of inflorescences formed on the outer row of leaf bases appeared to contribute to irregular flowering.