![]() No significant changes were seen in JA or SA levels. CPPU significantly increased levels of GA3 and IAA, while ABA levels decreased in the calyx in all treatments. ![]() Additionally, phytohormones (indole-3-acetic acid, IAA gibberellic acid, GA3 zeatin 2-cis-trans-abscisic acid, ABA jasmonic acid, JA and salicylic acid, SA) were analyzed to elucidate the relationship between fruit enlargement and calyx development. The length and width of the calyx were greatest in CPPU-treated fruits, and the width of the long or short side of the fruit was greatest in urea-treated fruits. Changes in physiological parameters (length, weight, and height of calyxes, number of seeds, fruit firmness, and soluble solids content) were investigated in response to CPPU and urea. Calyx-end cracking decreased with the application of both CPPU and urea. Persimmon (Diospyros kaki ‘Fuyu’) trees were sprayed with 10 mg∙L -1 of CPPU or 1% urea at blooming to determine whether application of these substances would reduce the incidence of calyx-end cracking.
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