Ensieh Ghorbani; Davood Bakhshi; Esmaiel Fallahi; Babak Rabiei
Abstract
In this study, calcium chloride (CaCl2) and two organic calcium compounds namely Calcicat and Folical were applied at four different spray programs including All-, Early-, Mid- and Late-season spray at the Abhar region in Zanjan were compared in 2012. Some qualitative characteristics of ‘Fuji’ ...
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In this study, calcium chloride (CaCl2) and two organic calcium compounds namely Calcicat and Folical were applied at four different spray programs including All-, Early-, Mid- and Late-season spray at the Abhar region in Zanjan were compared in 2012. Some qualitative characteristics of ‘Fuji’ apple fruit such as peel color and anthocyanin, internal ethylene concentration, total phenolic content and percentage of internal browning incidence were studied at harvest and during storage. The color indices namely L*، C*and h °were influenced by the calcium solution spray. Folical increased the L* index compared to control. Fruits which received calcium solutions had higher h° index and lower C* index than control. The anthocyanin content of fruit peel was influenced only by spray timing, at harvest. Late season spray resulted in less anthocyanin accumulation compared to other programs. Total phenolic content of the peel and pulp was affected by calcium compounds and spray programs in differently ways. There was not a clear trend in phenolic compounds change during storage; meanwhile, total phenolics decreased in the fruits peel and pulp. Calcium application decreased internal ethylene concentration. All calcium treatments significantly decreased the internal browning; however, it was not observed insprayed fruits by early season Folical and midseason Calcicat.
Kazem Arzani; Hassan Khoshghalb; Mohamad Jafar Malakouti; Mohsen Barzegar
Volume 12, Issue 2 , November 2010, , Pages 1-9
Abstract
The effect of Ca, Zn and B foliar application (five g l-1) and their mixed applications as well as two harvest dates (1st and 15st of August) on PPO activity of two commercial Asian pears (‘KS’9 and ‘KS’13) fruits at the time of harvest and during storage were investigated. Results ...
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The effect of Ca, Zn and B foliar application (five g l-1) and their mixed applications as well as two harvest dates (1st and 15st of August) on PPO activity of two commercial Asian pears (‘KS’9 and ‘KS’13) fruits at the time of harvest and during storage were investigated. Results showed that the PPO activity increased from harvest time to three months after storage and then decreased. During storage, PPO showed lower activity in the fruits harvested from foliar sprayed trees compared with nonsprayed trees for both harvest dates and in both cultivars. In the first harvest date (1st of August), PPO activity of foliar sprayed treatments were 256 (control), 212 (Ca), 163 (Zn), 171 (B) and 112 (Ca + Zn + B) for ‘KS’9 and 286 (control), 240 (Ca), 184 (Zn), 193 (B) and 136 unit activity min-1 per 100g-1 FW (Ca + Zn + B) for ‘KS’13. In the early harvested fruits (1st of August), the amount of PPO showed lower activity than the late harvested fruit during five months storage in two studied cultivars. Hence, it is concluded that Ca, Zn and B applications and earlier fruit harvest could affected to decrease in the enzymatic browning disorder and increase the storage longivity of fruits.