Journal
POSTHARVEST BIOLOGY AND TECHNOLOGY
Volume 142, Issue -, Pages 81-92Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.postharvbio.2018.01.021
Keywords
Salicylic acid; Pichia membranaefaciens; Oligochitosan; Citrus fruit; Induced resistance; Phenylpropanoids
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Funding
- Projects in the National Science & Technology Pillar Program during the Twelfth Five-year Plan Period [2015BAD16B07]
- National Natural Science Foundation of China [31471631]
- Technology Innovation Fund of Chongqing [cstc2016shms-ztzx80005]
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The effects of salicylic acid (SA), Pichia membranaefaciens and oligochitosan on induction of disease resistance in citrus fruit were investigated using transcriptomic and biochemical analysis in this study. The results of disease incidence and lesion diameter showed that application of exogenous elicitors SA (2.5 mmol L-1), P. membranaefaciens (1 x 10(8) cells mL(-1)) or oligochitosan (15 g L-1) were all effective in inhibiting blue and green molds in citrus fruit. Transcript profiling analysis of citrus fruit peel tissues revealed more differentially expressed genes in phenylpropanoid pathway metabolism induced by the three elicitors compared with other biological pathways. Moreover, biochemical analysis demonstrated that the three elicitors effectively enhanced phenylpropanoid pathway-related enzyme activities and stimulated the synthesis of phenolic acids and their subsequent metabolite lignin. Therefore, global results indicated that the activation of the phenylpropanoid biosynthesis pathway plays an important role in the induction of resistance in citrus fruit by the three elicitors.
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