Conditions of Storage and Improvement ofost-storage Quality of Kalanchoe blossfeldiana Pollen
Date Issued
2007
Date
2007
Author(s)
Hung, Wen-Chiu
Abstract
The objectives of this study were to evaluate the effects of storage temperature and flowering stage on post storage quality of Kalanchoe blossfeldiana Pollen after simulated dark storage and causes of leaf chlorosis and flower abortioning after simulated dark storage. Subsequently, using antitranspirant or growth regulators to improve the poststorage quality.e defined three inch potted Kalanchoe with 0%, 10±5% and 35±5% flowering as stage 1, 2 and 3, respectively. Simulated dark storage of 5, 10 and 15℃ for 7 or 14 days were given to double Kalanchoe ‘Mona’. Leaf chlososis and flower abortion increased with lower temperature and extending duration. The quality of all stages were the best after 10℃ simulated dark storage for 7 days. Also, ‘Naomi’ at stage 2 or 3 and‘Gabrielle’, ‘Jodie’ and ‘Karen’ at stage 3 had the best poststorage quality after simulated dark storage. Thereby, 10℃ is the optimum storage temperature, and the period of simulated dark storage is 7 days at most. Plants with lower flower bud percentage more appropriate for low temperature dark storage, because five cutivars of Kalanchoe at stage 3 with high flowering percentage, can all reach 84.2% flowering rate after storage, and had less chlorosis and flower abortion. But at this stage, half of flowers had fully opened and some opened flowers began wilting and senescence, so postharvest longevity didn’t reach 6~8 weeks. However, plant at stage 1 or 2 had decreased flowering rate and increased abortion after storage, resulting in serious chlorosis ever with leaves dropping.ompare poststorage quality of ‘Mona’, ‘Naomi’, ‘Gabrielle’, ‘Karen’, and ‘Jodie’ after storage under 10℃, lower leaf chlorosis of ‘Mona’ is more serious than ‘Naomi’ and ‘Gabrielle’, which only partially chlorotic at leaf tip and ‘Jodie’ and ‘Karen’ did not chlorosis at all. ‘Mona’ is intolerant of dark storage due to the dramatic change of upper and lower leaf thickness and the leaves where thinner than other cultivar.Mona’, ‘Gabrielle’, and ‘Naomi’ sprayed with ethephon 100 or 300 ppm lead to chlorosis and abortioing after dark storage. Among the five cutivars, ‘Mona’ is sensitive to ethylene and easily damaged, because it appears extremely chlorosis and abortioning ever with water-soak browning characteristic. Also ABA 25 μM induced the same symptom. Fumigating 1-MCP 0.2, 04, or 0.8 ppm and Fluridone 25 or 50 μM can delay quality descending. Although 1-MCP and Fluridone can delay chlorosis and abortion, post storage flowering percentage did not reach 60%. 1-MCP is more effective than Fluridone on both leaf chlorosis nad flower abortioning.retreatment spraying of antitransiprant 4 or 8 mg•L-1 increased stomatal resistance, but did not increase transpiration rate and can not retard the chlorosis of lower leaves and flower abortion. Treatment with BA 25, 50, 100 μM, GA3 100 μM, GA4+7 25, 50 μM or Promalin at 50, 100 mg•L-1 all decrease leaf chlorosis and flower abortion; combine of GA3 and BA with half of concentration (50 μM) is just as effectively as GA3 or BA alone at full concentration (100 μM) can decreased chlorosis from 16.5 to 2.8 and abortioning from 27.7% to 10.8%. Except 100 μM of GA3, 100 μM BA and 50 μM BA+50 μM GA3 induced flower malformation and incompletely explodding. Consequently diminishing BA concentration, the 25 μM or 50 μM of BA or GA4+7, and 50 or 100 mg•L-1 Promalin which is 1.8% gibberellin4+7 combination with 1.8% benzyladenine, all significantly decreased number of chlorotic leaves and make flowering over 75.9%. The poststorage quality of GA4+7 and Promalin treatment were the best among all growth regulators used. Therefore by using the GA4+7 25 μM or Promalin 50 mg•L-1 for improving the quality of Kalanchoe after simulated dark storage can promote ornamental value.
Subjects
Kalanchoe
Storage
Quality
Type
thesis
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