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Isolation and Identification of Sour Rot Pathogen of Satsuma Mandarin and Inhibitory Effects of Three Antifungal Substances on It

ZHAO Yijie1, TANG Yi1, WANG Weihao1, YAO Shixiang1, DENG Lili1,2, ZENG Kaifang1,2,*   

  1. 1. College of Food Science, Southwest University, Chongqing 400715, China;
    2. Chongqing Engineering Research Center of Regional Food, Chongqing 400715, China
  • Online:2017-04-15 Published:2017-04-24

Abstract: This investigation aimed to identify the sour rot pathogen of satsuma mandarin and to test the effect of Pichia membranaefaciens, salicylic acid and chitosan oligosaccharide in controlling this pathogen. We isolated a fungal pathogen from naturally infected citrus fruits and identified it as Geotrichum candidum on the basis of morphological characteristics, rDNA-ITS sequence analysis and pathogenicity. In addition, 2.5 mmol/L salicylic acid and 1.5% chitosan oligosaccharide could significantly inhibit the germination and mycelial growth of G. candidum under detached conditions. The volatile substances of P. membranaefaciens could inhibit the mycelial growth of G. candidum. Similarly, 1 × 108 CFU/mL P. membranaefaciens, 2.5 mmol/L salicylic acid and 1.5% chitosan oligosaccharide treatment of the same and different wounds could control sour rot incidence and lesion diameter, especially P. membranaefaciens and salicylic acid through inoculation on the same wounds and different wounds, respectively.

Key words: satsuma mandarin, sour rot, Pichia membranaefaciens, salicylic acid, chitosan oligosaccharide

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