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Acta Horticulturae Sinica ›› 2026, Vol. 53 ›› Issue (7): 2092-2106.doi: 10.16420/j.issn.0513-353x.2026-0281

• Cultivation · Physiology & Biochemistry • Previous Articles     Next Articles

Effects of Exogenous Melatonin and Dopamine on Nutrient Absorption and Drought Resistance Evaluation of Apple Plants Under Drought Stress

SUN Nan1, LIU Huaite1, CAO Yang1,2, DU Peihua1,2, ZHANG Xueying1,*(), LIANG Bowen1()   

  1. 1 College of HorticultureHebei Agricultural University,Hebei, Baoding 071000, China
    2 College of Horticulture and ForestryTarim University;The National and Local Joint Engineering Laboratory of High Efficiency and Superior-Quality Cultivation and Fruit Deep Processing Technology of Characteristic Fruit Trees in Southern Xinjiang,Alar, Xinjiang 843300, China
  • Received:2026-03-23 Revised:2026-06-12 Online:2026-07-25 Published:2026-07-23
  • Contact: ZHANG Xueying, LIANG Bowen

Abstract:

Using grafted seedlings of‘Tianhong 2’/Malus hupehensis as experimental materials,a pot experiment was conducted with two water regimes(moderate drought and normal water supply)combined with three exogenous treatments:no exogenous substance application,melatonin application (100 μmol · L-1),and dopamine application(100 μmol · L-1),resulting in six treatments in total. After 60 days of treatment,the dry weight of each plant part,mineral element contents,uptake flux,translocation rate,and accumulation amount were measured. The regulatory effects of exogenous melatonin and dopamine on nutrient uptake and utilization in apple plants under drought stress were analyzed. Meanwhile,principal component analysis and the membership function method were used to comprehensively evaluate drought resistance. The results showed that drought stress significantly decreased the dry weight of roots,stems,and leaves,reduced mineral element uptake and their accumulation in roots,and significantly inhibited the translocation rates of mineral elements to leaves and stems. Exogenous application of melatonin and dopamine significantly increased the dry weight of each plant part and the uptake of mineral elements under drought stress,and simultaneously enhanced the translocation rates of mineral elements to leaves and stems as well as their accumulation in roots. Mineral element contents were significantly or highly significantly correlated with organ dry weight and nitrogen,phosphorus,and potassium content. The drought resistance of plants treated with melatonin was higher than that of plants treated with dopamine. In conclusion,melatonin and dopamine can promote apple plant growth and improve drought resistance by regulating nutrient uptake and utilization,with melatonin being more effective than dopamine.

Key words: apple, drought tolerance, melatonin, dopamine, nutrient uptake, comprehensive evaluation