Tree Genetics and Molecular Breeding 2024, Vol.14, No.6, 295-303 http://genbreedpublisher.com/index.php/tgmb 299 The differences in xanthophyll content were also notable, with DGF3 recording the highest xanthophyll content in the pulp (32.7 µg/g), while DGF2 showed the highest value in the peel (24.1 µg/g), demonstrating favorable nutritional accumulation. Antioxidant capacity was evaluated using the DPPH and ABTS methods. The results revealed that DGF2 had the highest antioxidant activity in the pulp, reaching 75.3% with the DPPH method and 87.9% with the ABTS method. In contrast, DGF4 exhibited the highest antioxidant activity in the peel, with DPPH and ABTS values of 81.2% and 89.8%, respectively (Abirami et al., 2021). These findings indicate that DGF2 and DGF4 genotypes exhibit exceptional antioxidant capacity, which contributes to their ability to scavenge free radicals and delay aging. Color parameter analysis further revealed variations in pigment composition between the peel and pulp of the four genotypes. The L value (brightness), a value (red-green), and b value (yellow-blue) ranged from 11.7-51.0, -0.6 to 21.4, and -2.5 to 2.5, respectively, for the pulp, and 13.6-40.8, 3.8 to 24.0, and 4.4 to 19.0, respectively, for the peel. The hue and chroma values for the pulp ranged from -76.0 to 77.5 and 2.1 to 21.5, respectively, while for the peel, they varied from 16.3 to 78.5 and 12.0 to 26.0. These color variations reflect differences in pigment accumulation and fruit appearance among the genotypes, which are likely associated with phenolic and carotenoid content (Figure 2) (Abirami et al., 2021). Figure 2 An illustration of important traits of three different Hylocereus species of dragon fruit (Adopted from Abirami et al., 2021) Image caption: Cladode characters: (A) length of segments (cm), (B) number of spines and (C) margin ribs of cladode; Flower characters: (D) flower bud shape and (E) shape of apex; fruit characters: (F) fruit length (cm) and (G) position towards the peel (Adopted from Abirami et al., 2021)
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