ISHS Acta Horticulturae 620: XXVI International Horticultural Congress: Asian Plants with Unique Horticultural Potential: Genetic Resources, Cultural Practices, and Utilization
PHYSIOLOGICAL AND BIOCHEMICAL CHANGES DURING PUPATION OF FREESIA HYBRIDA CORMS IN RESPONSE TO STORAGE TEMPERATURE |
| Authors: | J.-J. Lee, Y.-G. Choi, J.-C. Kim |
| Keywords: | pupa formation, ethylene, carbon dioxide, sugar content, plant hormone |
| Abstract:
The harvested Freesia corms were stored for 10 months at 1, 5, 10, 15, 20, or 25 °C. Pupation, known as a morphological process of formation of small corms on the old one during the long-term storage period, readily occurred at the range of 5 to 15 °C storage temperatures, with 15 °C being most effective. The corms stored at 1, 20, and 25 °C showed no pupa formation even after 10 months of storage. The respiration rate remained higher in the corms at the pupation-inducing temperatures than those at the non-pupation temperatures throughout storage period. In the pupation-inducing conditions sugar concentration substantially decreased largely in the form of glucose. This decline occurred earlier in the order of 15, 10, and 5 °C, which was positively related to the time of pupa formation at each temperature. Ethylene concentration peaked at 3 months after storage (i.e., 1 month before pupa formation) and then gradually decreased. Regardless of storage temperatures, ABA concentration substantially decreased within the first 3 months of storage. A slight but significant increase in the concentration of ABA occurred 4 to 5 months after storage from the corms under the pupation-inducing temperature conditions, while those at the non-pupation inducing temperatures retained minimal levels. There were no marked changes in the concentrations of IAA in relation to pupation. The concentrations of zeatin tended to show peaks at the early stage of pupation and decrease thereafter. | |
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