Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 67, Issue 12, Pages 3293-3304Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.9b00031
Keywords
Solanum lycopersicum; immune response; Rhodosporidium paludigenum; pectinolytic enzymes; pectin methylesterases
Funding
- National Natural Science Foundation of China [31701668, 31571897]
- Key Technologies R&D Program of Tianjin [16YFZCNC00700]
- Natural Science Foundation of Tianjin [17JCQNJC14300]
- Open Project Program of State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science Technology [SKLFNS-KF-201827]
- Project program of Key Laboratory of Food Nutrition and Safety, Ministry of Education [2018011]
- Foundation of Tianjin University of Science and Technology, Institute for New Rural Development, P. R China [xnc201706]
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The acquisition of susceptibility to necrotrophy over the course of ripening is one of the critical factors limiting shelf life. In this study, phytopathology and molecular biology were employed to explore the roles of pectinase in fruit susceptibility and ripening. Solanum lycopersicum fruit softened dramatically from entirely green to 50% red, which was accompanied by a continuously high expressed SlPG2 gene. The necrotrophic fungus Botrytis cinerea further activated the expression of SlPGs and SlPMEs to accelerate cell wall disassembly, while most of the polygalacturonase inhibitor proteins encoding genes expression were postponed in ripe fruit following the pathogen attack. Pectin induced the antagonistic yeast to secrete pectinolytic enzymes to increase fruit resistance against gray mold. The activities of pathogenic pectinase of B. cinerea were correspondingly depressed in the pectin-inducible yeast enzyme elicited ripe fruit. These data suggest that pectinase is a molecular target for regulation of disease resistance during fruit ripening.
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