Effects of corm storage or chilling temperatures and durations on accelerated flowering of Ixia
2010
Norikoshi, R., Tokyo Univ. of Agriculture, Atsugi, Kanagawa (Japan). Faculty of Agriculture | Arai, Y. | Kano, T. | Nakazawa, K. | Koike, Y. | Imanishi, H.
This study was carried out to investigate the possibility of accelerating flowering by applying chilling to corms before planting in Ixia 'Venus'. Flowering was most advanced by chilling corms with peat moss under wet conditions, and the optimum chilling temperature was 8-12degC. When corms were subjected to chilling at 8degC for 4-8 weeks under wet conditions, flowering became earlier in those chilled for longer periods. When corms were stored at 20degC for various durations under dry conditions before chilling at 8degC for 8 weeks, sprouting became earlier in those stored for longer periods and they all flowered and exhibited full chilling response by chilling after storage for 6 weeks or more. Compared to those stored at 20degC, when corms were stored at 30degC, sprouting was delayed and flowering percentage decreased with increasing storage period. Based on these results, the earliest flowering was obtained when corms were stored at 20degC for 6 weeks or more under dry conditions immediately after digging and then chilled at 8degC for 8 weeks under wet condition. It was also suggested that flowers could be harvested in late December when chilling started in early August.
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