Fruit quality characteristics and evaluation in F<sub>1</sub> generation of three hybrid combinations of ‘Yuhuanyou’（<italic>Citrus grandis</italic>）

<bold>Objective</bold> The fruit quality characteristics in F₁ generation of three hybrid combinations with ‘Yuhuanyou’ as female parent were evaluated to screen hybrid offspring with excellent comprehensive traits. <bold>Method</bold> The ‘Yuhuanyou’ was used as the female parent，and the three male parents of ‘Xinmuyou’（2010），‘Majiayou’（2011）and ‘Changshanhuyou’（2012）were cross-pollinated.At fruit maturity stage，the main fruit quality characteristics of YX-1（male parent ‘Xinmuyou’），YM-1（male parent ‘Majiayou’）and YC-1（male parent ‘Changshanhuyou’）with the best comprehensive performance were analyzed after preliminary screening of F₁ generation of three hybrid combinations，including fruit diameter and length，fruit shape index，fruit weight，segment number，seed number，peel thickness，edible rate，juice percentage，total soluble solid，soluble sugar，titratable acid，vitamin C，solid acid ratio，color index and sugar acid composition.Based on these factors，principal component analysis was used for comprehensive evaluation. <bold>Result</bold> The results showed that the YM-1 had red flesh，fruit weight was 1.75 kg，fruit seed number was 157.67，edible rate was 63.43%，juice percentage was 55.61%，total soluble solid content was 12.09%，soluble sugar content was 8.67%，titratable acid content was 0.72%，vitamin C content was 97.33 mg/100 g.The YC-1 had white flesh，fruit weight was 1.41 kg，fruit seed number was 105.50，edible rate was 62.83%，juice percentage was 66.76%，total soluble solid content was 10.98%，soluble sugar content was 10.87%，titratable acid content was 1.16%，vitamin C content was 92.67 mg/100 g.The YX-1 had red flesh，fruit weight was 1.08 kg，fruit seed number was 138.33，edible rate was 52.98%，juice percentage was 50.99%，total soluble solid content was 11.30%，soluble sugar content was 7.76%，titratable acid content was 0.68%，vitamin C content was 60.33 mg/100 g.There were significant differences in the main quality indexes of the three hybrid combinations F₁ generation with ‘Yuhuanyou’ as the female parent，the results of principal component analysis showed that YM-1 had the highest comprehensive score，followed by YC-1. <bold>Conclusion</bold> The YM-1 and YC-1 can be used as the next research focus for clone cultivation and evaluation.