Prohexadione-CA modifies content of gibberellins and vitamin C, antioxidant capacity and enzymatic activity in apple
2010
Ramirez, H. | Leza-Hernandez, P.C. | Benavides, A. | Amado-Ramirez, C. | Martinez-Osorio, A. | Rivera-Cruz, C.E.
The present research was conducted to better understand the effects of prohexadione-Ca (P-Ca) on the gibberellin changes at the apex and on the antioxidants and enzyme behavior on ripening fruits of apple (Malus ×domestica). P-Ca was sprayed twice in the spring of 2008 on sixteen-year old ‘Red Delicious’/ M.106 apple trees when shoot growth reached 5 cm in length. The concentration dosages of the growth retardant were 0 (control), 125, 175 and 200 mg•L-1. The GC-MS analysis of experimental samples showed the presence of gibberellins A9 and A20 in P-Ca treated shoot tips; whereas gibberellins A1, A4, and A7 were identified in control samples. The total antioxidant content in ripening fruits was increased with any concentration of P-Ca. A similar pattern was also observed in those fruits when vitamin C, catalase and peroxidase enzymes content were measured.
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