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Bosc is a winter cultivar of european pear ( Pyrus communis ) that has a relatively short storage life partially due to a high ethylene production rate (EPR) during cold storage. ‘Bosc’ pears were harvested at commercial maturity and treated with gas 1-methylcyclopropene (1-MCP) at 0, 0.15, and 0.3 µL·L −1  and stored at −1.1 °C for 8 months. Results indicated that all 1-MCP treatments inhibited EPR and respiration rate (RR), retarded the degradation of chlorophyll and titratable acidity (TA), and extended storage quality; but inhibited ripening capacity. 1-MCP at 0.15 and 0.3 µL·L −1  had the same efficacy on keeping fruit quality although its higher rate was more efficient on inhibiting EPR and RR. The expression of ethylene synthesis genes ( PcACS1 ,  PcACS2 ,  PcACS4 ,  PcACS5 , and  PcACO1 ) and receptor genes ( PcETR1 ,  PcETR2 , and  PcERS1 ) was upregulated in control fruit during storage and they were downregulated significantly by 1-MCP treatments. In contrast, the ethylene receptor genes of  PcETR5  and  PcCTR1  were downregulated in control fruit during storage and were unaffected by 1-MCP treatments. Although the transcription levels of chlorophyll degradation genes  PcPPH ,  PcNOL ,  PcSGR ,  PcRCCR ,  PcNYC , and  PcPAO  were all upregulated in control fruit during storage and downregulated by 1-MCP; only  PcCHL  was downregulated in the control and 1-MCP had no consistent effect on it. The relationship of ethylene biosynthesis/perception with chlorophyll degradation and storage quality in european pears was discussed.

journal of the american society for horticultural science

Inhibition of Ethylene Biosynthesis and Perception by 1-Methylcyclopropene and Its Consequences on Chlorophyll Catabolism and Storage Quality of ‘Bosc’ Pears