落花后外源喷施萘乙酸对海棠果实品质的影响OA

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.