Effects of Two Plant Growth Regulators on Yield and Fruit Quality of Hainan Guifei Mango(Mangifera indica L.)
A mango cultivar "Guifei"(Mangifera indica L.)was used to study the effect of gibberellic acid(GA3)and forchlorfenuron(CPPU or KT-30) on the yield and fruit quality. Results:(1)GA3treatment had a better effect on the yield and fruit quality, and the concentrations of 150 mg/L and 250 mg/L significantly increased the yield,fruit form index, fruit weight, edible rate and sugar-acid ratio;( 2)CPPU treatments promoted fruit enlargement more obviously than GA3 treatment, and significantly increased the edible rate and fruit hardness, but could not significantly increase the yield, and significantly increase the number of abnormal fruit. Higher concentrations significantly reduced sugar-acid ratio(significantly increased titratable acid), while lower concentrations 5 mg/L and10 mg/L were suitable;(3)GA3150 mg/L+CPPU 5 mg/L treatment was significantly better than treatments with only GA3 or CPPU on fruit enlargement, and it lead to obviously lower yield, Soluble solids content, soluble sugar content and sugar-acid ratio over the treatment GA3150 mg/L;(4)CPPU treatment and lower concentrations of GA3treatment(50 mg/L and 150 mg/L) delayed the degradation of chlorophyll in mango peel, but higher concentrations(250 mg/L and 500 mg/L)promoted it and the synthesis of anthocyanin. GA3 and CPPU treatments promoted the accumulation of carotenoid. CPPU and the combination treatments inhibited the synthesis of anthocyanin. The study would provide a reference for the security production of mango fruit.