Effect of Plant Growth Regulators on Fruit Quality of Fig (Ficus carica L.)

Abstract

     A study on the effect of plant growth regulators on fruit quality of fig cv. Black genoa was conducted at Pomology greenhouse, Maejo University, Chiang Mai province from December 2019 to May 2020. The experimental design was a completely randomized design (CRD) with 3 replications 4 treatments as 1) control (tap water) 2) 1- (2-chloropyridin-4-yl) -3-phenylurea (CPPU) 20 mg/L 3) Brassinosteroids (Brs) 1 mg/L and 4) 3,5,6-TPA Maxim® (3,5,6-trichloro-2-pyridinyloxyacetic acid) 30 mg/L. All treatments were single sprayed on the fruit at 7 weeks after fruit set.  After fruit harvest, fruit attributes were measured and analyzed. The results showed that the fruit sprayed with 1 mg/L Brs had the highest fruit weight as 68.13 g, the widest fruit 52.38 mm, the longest fruit 56.10 mm compared with the control. Furthermore, it was highest in TSS 17.12 ºBrix, anthocyanin content 19.46 mg/100gFW and phenolic compound content 936.26 µg GAE/g FW compared to others. In addition, the fruit sprayed with 30 mg/L 3,5,6-TPA was highest in fruit firmness as 85.77 kg/cm², while TSS/TA was lowest as 123.83. All treatments had no effect on TA, pH, and Total vitamin C.