Effects of Exogenous Spraying of Naphthalene Acetic Acid on Quality of Crabapple Fruits after Flower Fall
Zhao Mingjie
Li Luoya
Zong Xiajing
Fan Yuwei
Guo Xiaoqian
Zou Feiran
Niu Yunhua
Yang Luguang
Wang Haiyan
Zhang Manman
Mao Yunfei
Shen Xiang
Abstract：One of the primary challenges facing crabapple(Malus spectabilis)development in China is the small fruit,and among the various strategies to address this issue,spraying hormones is one of the most ef-fective measures.In this study,the low-priced,eco-friendly plant hormone naphthalene acetic acid(NAA)was used as the test material,four treatments of spraying different concentrations of NAA or mixture of NAA and 2,3,5-triiodobenzoic acid(TIBA)after crabapple flower fall were set with spraying water as control(CK),and their effects on the crabapple fruit quality was studied.The results showed that spraying 1.0 μmol/L NAA alone could significantly increase the single fruit weight of crabapple by 29.23%compared with the control,which decreased by 16.76%compared with the controlin 1.0 μmol/L NAA+100 μmol/L TIBA treat-ment.The contents of flavonoid,anthocyanin and soluble sugar in treatments of spraying NAA alone were sig-nificantly higher than those of control,and the vitamin C content was obviously higher than that of control,which were higher in 1.0 μmol/L NAA treatment than those in 0.1 μmol/L NAA treatment.The treatments with mixture of NAA and TIBA reduced contents of flavonoid,anthocyanin,soluble sugar and vitamin C in fruits.Spraying 1.0 μmol/L NAA alone could significantly increase the contents of nitrogen and phosphorus and the activities of phenylalanine ammonia-lyase and superoxide dismutase,which were reduced treatments with mixture of NAA and TIBA,but no significant difference was observed.In summary,spraying 1.0 μmol/L NAA alone could greatly increase the single fruit weight,improve the disadvantage of small fruit,and im-prove the intrinsic quality and mineral element content of crabapple fruits.The results of this study could lay a theoretical foundation for the cultivation of high-quality crabapple varieties with large fruits,and also provide a technical reference for improving the ornamental value of crabapple and the development of crabapple fruit val-ue.
Keywords：Naphthalene acetic acidCrabapple(Malus spectabilis)Fruit qualityFruit size
Publication Date：2026-01-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 47-53 )