Biotechnology Bulletin ›› 2022, Vol. 38 ›› Issue (3): 69-78.doi: 10.13560/j.cnki.biotech.bull.1985.2021-0521

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Screening of Antagonist Against Tomato Fruit Rot and Their Preservation Qualities on Tomato

ZHANG Hong-yan(), LIN Guo-li, LI Ru-lian, JI Xiao-qi   

  1. Life Science and Technology School,Lingnan Normal University,Zhanjiang 524048
  • Received:2021-04-19 Online:2022-03-26 Published:2022-04-06

Abstract:

A strain of fruit rot pathogen was isolated from storing tomatoes. In order to clarify the taxonomic status and investigate the suitable biocontrol strain,its morphology and phylogenetic analysis were conducted. The antagonistic Streptomyces was isolated and identified,and its effect on the preservation of tomato was studied. The results showed that the pathogen Qyg16-2 that caused the fruit rot of tomato was Botryosphaeria dothidea. The actinomecetes X13 with good antagonistic effects from healthy tomato rhizospheric soil on Qyg16-2 was identified as Streptomyces sampsonii by morphology,physiological and biochemical characteristics and 16S rDNA sequence. X13 significantly inhibited the colony extension and spore germination of pathogen B. dothidea,its cell-free fermentation filtrate significantly increased the activity of PPO,POD and PAL,decreased the decay index of stored tomato,and delayed the decline of post-harvest tomato fruit firmness,soluble solid content,titration acid content and vitamin C content. Conclusively,S. sampsonii X13 has significant antagonistic effects on B. dothidea,and has promising preservation effect in storing tomato fruit.

Key words: post-harvest tomato, Botryosphaeria dothidea, Streptomyces sampsonii, screening, preservation