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Submitted to: Fourth International Conference on Mycorrhizae
Publication Type: Abstract Only Publication Acceptance Date: 6/20/2003 Publication Date: 8/4/2003 Citation: MYCORRHIZA-INCUCED CHANGES IN PARTITIONING AND COMPOSITION ALTERS FLOWER AND VEGETATION PRODUCTION OF FLORAL GEOPHYTES. Scagel, C.F. Interpretive Summary: Resource partitioning and plant storage components are important factors that influence the productivity and profitability of geophyte species produced as floral crops. We determined that inoculation with vesicular-arbuscular mycorrhizal fungi (VAMF) can alter different plant characteristics affecting productivity and quality of bulb and cut flower production of several floral geophytes including Brodiaea laxa, Zephyranthes spp., Sparaxis tricolor, Freesia x hybrida, Zantedeschia spp., and Calla spp. In general, shoots and flowers on plants inoculated with VAMF emerged earlier than shoots and flowers on non-inoculated plants for species that produced most of their leaf area prior to flower emergence. However for species that produced leaves throughout the growth cycle or large flowers early in the growth cycle, VAMF inoculation delayed shoot emergence and flower emergence. Many species that exhibited an earlier flower emergence or produced more flowers in response to VAMF inoculation also produced smaller daughter bulbs and more offsets than non-inoculated plants. Across all species, the concentrations and contents of several storage components (Zn, S, N, amino acids, and carbohydrates) that influence bulb quality were increased by VAMF inoculation. Changes in partitioning between bulb and flower production resulting from VAMF inoculation altered important aspects of commercial geophyte production for flowers or bulbs. VAMF-induced increases in mineral uptake and resource storage are also related to aspects of quality important in the production of vegetative propagates. Technical Abstract: Resource partitioning and plant storage components are important factors that influence the productivity and profitability of geophyte species produced as floral crops. We determined that inoculation with vesicular-arbuscular mycorrhizal fungi (VAMF) can alter different plant characteristics affecting productivity and quality of bulb and cut flower production of several floral geophytes including Brodiaea laxa, Zephyranthes spp., Sparaxis tricolor, Freesia x hybrida, Zantedeschia spp., and Calla spp. Plant growth, flower production, bulb/corm/tuber (bulb) production and composition were measured for two growth cycles after inoculation with Glomus intraradices. In general, shoots and flowers on plants inoculated with VAMF emerged earlier than shoots and flowers on non-inoculated plants for species that produced most of their leaf area prior to flower emergence. However for species that produced leaves throughout the growth cycle or large flowers early in the growth cycle, VAMF inoculation delayed shoot emergence and flower emergence. Many species that exhibited an earlier flower emergence or produced more flowers in response to VAMF inoculation also produced smaller daughter bulbs and more offsets than non-inoculated plants. Across all species, the concentrations and contents of several storage components (Zn, S, N, amino acids, and carbohydrates) that influence bulb quality were increased by VAMF inoculation. Changes in partitioning between bulb and flower production resulting from VAMF inoculation altered important aspects of commercial geophyte production for flowers or bulbs. VAMF-induced increases in mineral uptake and resource storage are also related to aspects of quality important in the production of vegetative propagates. |
