Acta Horticulturae Sinica ›› 2022, Vol. 49 ›› Issue (5): 1102-1110.doi: 10.16420/j.issn.0513-353x.2021-0159

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Exogenous Melatonin Regulates Reactive Oxygen Metabolism to Induce Resistance of Postharvest Pear Fruit to Black Spot

XIANG Miaolian1, WU Fan1, LI Shucheng1, MA Qiaoli1, WANG Yinbao1, XIAO Liuhua1, CHEN Jinyin1,2, CHEN Ming1,*()   

  1. 1Collaborative Innovation Center of Postharvest Key Technology and Quality Safety of Fruits and Vegetables in Jiangxi Province,Jiangxi Key Laboratory for Postharvest Technology and Non-destructive Testing of Fruits & Vegetables,College of Agronomy,Jiangxi Agricultural University,Nanchang 330045,China
    2Pingxiang University,Pingxiang,Jiangxi 337055,China
  • Received:2022-01-12 Revised:2022-02-28 Online:2022-05-25 Published:2022-05-25
  • Contact: CHEN Ming


‘Cuiguan’pears were used as materials to explore the effect of exogenous melatonin(MT)on the induced resistance to postharvest pear black spot caused by Alternaria alternata. To this end,the resistance to A. alternata and black spot were detected in MT treated pear fruits. The results showed that MT treatment(0.025-0.300 mmol · L-1)had no significant inhibition on mycelial growth and spore germination rate of A. alternata. However,it could remarkably reduce black spot of pear fruit and 0.100 mmol · L-1 MT treatment had the highest induced resistance effect of 45.04%. In comparison with the control,the activities of CAT,SOD,POD,APX and PPO,as well as the content of total phenolics,were obviously increased in 0.100 mmol · L-1 MT treated fruits and the accumulation of MDA was just effectively reduced on the contrary. The above results indicated that exogenous melatonin inducing pear fruit resistance against A. alternata infection might be related to the regulation of reactive oxygen species metabolism.

Key words: pear, fruit, black spot, Alternaria alternata, melatonin, induced resistance, reactive oxygen metabolism

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