Effect of chitin on the antagonistic activity of Rhodosporidium paludigenum against Penicillium expansum in apple fruit |
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| Institution: | 1. College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China;2. National Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang University, Hangzhou 310058, China;3. Key Laboratory for Agro-Products Postharvest Handling of Ministry of Agriculture, Zhejiang University, Hangzhou 310058, China;4. Zhejiang Key Laboratory for Agro-Food Processing, Zhejiang University, Hangzhou 310058, China;1. Department of Food Science and Technology, College of Agriculture, Isfahan University of Technology, Isfahan 84156, 83111, Iran;2. Institute of Biotechnology and Bioengineering, Isfahan University of Technology, Isfahan, Iran;1. College of Food Science, Southwest University, Chongqing 400715, PR China;2. Chongqing Special Food Programme and Technology Research Center, Chongqing 400715, PR China;1. Universidade Federal de Santa Catarina, Departamento de Engenharia Química e Engenharia de Alimentos, Campus Universitário-Trindade, 88040-900 Florianópolis, SC, Brazil;2. Centre de Tecnologia Postcollita (CTP), Institut Valencià d’Investigacions Agràries (IVIA), Apartat Oficial, 46113 Montcada, València, Spain;3. Fundación AGROALIMED, Spain |
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| Abstract: | This study aimed to investigate the effect of chitin on the antagonistic activity of Rhodosporidium paludigenum against Penicillium expansum, the cause of blue mold in apple fruit, and the possible mechanisms involved. Our results showed that biocontrol efficacy and population growth of R. paludigenum were greatly enhanced when it was harvested from nutrient yeast dextrose with added chitin (NYCB) medium compared with that harvested from nutrient yeast dextrose (NYDB) medium. The ability of R. paludigenum produced in NYCB to induce resistance to blue mold in apple fruit was significantly enhanced. The enhanced disease control efficacy was correlated with higher levels of polyphenoloxidase (PPO) and superoxide dismutase (SOD) activities in apple fruit treated with R. paludigenum. Moreover, the SOD and catalase (CAT) activities of R. paludigenum were stimulated by cultivating in NYCB, while malondialdehyde (MDA) accumulation in the yeast cells was suppressed. These results indicated that adding chitin to normal media might be an effective method to improve the antagonistic activity of R. paludigenum and the active oxygen metabolism of R. paludigenum might be closely related to the biocontrol activity of the yeast. |
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| Keywords: | Apple fruit Chitin Postharvest biological control |
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