Plant Development / Développement des plantes (CBA/ABC)
Sand, Laura , Riseman, Andrew .
Effects of Plant Growth Regulators and Temperature on Floral Induction of Exacum Styer Group.
Plants of Exacum Styer Group (Gentianaceae), interspecific hybrids of five Sri Lankan taxa, have significant horticultural potential as flowering potted plants, bedding plants and cut flowers. However, before this new crop can reach its commercial potential, a better understanding of the factors regulating floral induction and flower development are needed. Previous studies have demonstrated that flower induction in E. Styer Group is not regulated by photoperiod, however, light sum, node number, and/or temperature have all been implicated. In addition, developmental patterns suggest the involvement of gibberellin. We examined the impact of plant growth regulators (PGRs) on floral induction and subsequent plant development utilizing ethephon (Ethrel, 500 and 1000 PPM), daminozide (B-Nine, 2500 and 3500 PPM), gibberellin (GA4+7, 10 and 15 PPM), and a control of water plus surfactant. Preliminary analysis showed a significant interaction between genotype and treatment for most parameters measured. Treatment with anti-GA compounds resulted in a delay in floral initiation response across all treatments, however no treatment was shown to completely prevent flowering. Experiments evaluating the effect of temperature on floral induction and subsequent plant development have revealed that an increased temperature leads to decreased time to flower. Low temperature treatment (16/12C) prevented any significant growth whilst high temperature treatment (30/26C) resulted in faster flowering in five of six genotypes when compared to a medium temperature treatment (23/19C). Most plants in the high temperature treatment produced more nodes before the first visible bud than in the medium temperature treatment.
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1 - University of British Columbia, Faculty of Land and Food Systems, 2357 Main Mall, Vancouver, BC, V6T 1Z4, Canada
2 - University of British Columbia, Botanical Garden And Centre For Plant Research, 6804 Sw Marine Drive, Vancouver, British Columbia, V6T 1Z4, Canada
Exacum Styer Group
plant growth regulators
Presentation Type: Poster:Posters for Sections
Location: Ball Room & Party Room/SUB
Date: Monday, July 28th, 2008
Time: 12:30 PM