Pre and postharvest hormonal changes of carrots.
Halloran N., Kasim M.U., Kasim R.
5th International Postharvest Symposium. Volume of Abstract. Verona, Italy 6-11 June 2004, p.76
2004
บทคัดย่อ
Pre and postharvest hormonal changes of carrots.
Auxin, gibberellins, cytokinin, ethylene and abcissic acid content were evaluated during growth, development and cold storage at 0 ° and 5 °C to determine the effect of hormonal profile on sprouting and rooting which are the most important postharvest quality criteria for carrots.Other quality parameters such as sensory quality, respiration rate, weight loss, total soluble solids and morphological differentiation on the roots were also investigated during the experiments.While auxine increased through harvest and decreased at harvest time, ABA and GA3 were low at the beginning of growth and development period and increased through harvest.The level of all those hormones were found higher in leaf tissues than roof samples.Ethylene production decreased in leaf tissues and increased in roots during growth and development period.Cyotkinis were accumulated in root tissues during this period then decreased at harvest maturity.
Auxine level increased while ABA and GA3 decreased during cold storage at 0 and 5 °C and rooting and sprouting occurred during this period.Ethylene level increased at the beginning of storage period and then decreased.Rooting was noticeable during low ethylene production period.Ethylene level increased again due to senescence at the end of storage.Cytokinin level showed a general decrease after reaching to a pick value during cold storage.Hormonal changes showed that there is a short dormancy period after harvest due to pre-harvest hormonal accumulation.Dormancy period ended with the decrease of ABA, ethylene and GA3 and with the decrease of cytokinin and auxine during storage period.All other criteria investigated in this research also proved the existence of dormancy period.