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‘Starkrimson’ is a highly profitable red-skinned european pear ( Pyrus communis ) cultivar that has a short storage life due mainly to the development of a mealy texture upon ripening and an internal browning (IB) disorder during or after storage. In 2013, ‘Starkrimson’ pears were sprayed with aminoethoxyvinylglycine (AVG) at 0, 30, 60, and 120 mg·L −1  1 week before harvest or treated with 1-methylcyclopropene (1-MCP) at 0.3 µL·L −1  for 24 hours shortly after harvest, then stored at −1.1 °C and evaluated over a 16-week period. The experiment was repeated in 2014. After 2 weeks of storage, control fruit (nontreated) had a higher respiration rate and ethylene biosynthesis than AVG or 1-MCP-treated fruit. Following 12 weeks of storage, control fruit exhibited a greater incidence of mealy texture and greater extractable juice (EJ) after ripening, and by 16 weeks significantly higher IB relative to AVG and 1-MCP-treated fruit. AVG at 30 mg·L −1  had little effect on any of the storage responses measured compared with control. AVG at 60 mg·L −1  reduced ethylene synthesis, respiration rate, and titratable acidity (TA) loss and maintained high eating quality with low EJ. Fruit treated with 60 mg·L −1  AVG also developed markedly less IB following 16 weeks of storage than control or 30 mg·L −1  AVG treatments. AVG at 120 mg·L −1  did not improve storage quality achieved with 60 mg·L −1  but delayed ripening capacity by 1 month. 1-MCP markedly inhibited ethylene synthesis and respiration rate and eliminated IB during 16 weeks of storage; however, 1-MCP-treated fruit required 14 days at 20 °C to ripen to high eating quality following 12 to 16 weeks of storage compared with 5 days for 60 mg − L −1  AVG. Both AVG and 1-MCP suppressed the expressions of ethylene synthesis ( PcACS1 ,  PcACS4 ,  PcACS5 , and  PcACO1 ) and perception genes ( PcETR1 ,  PcETR2 , and  PcETR5 ) although 1-MCP was more efficient than AVG. In conclusion, preharvest AVG applications at 60 mg·L −1  or postharvest 1-MCP treatment at 0.3 µL·L −1  extended storage life of ‘Starkrimson’; however, 1-MCP inhibited ripening capacity whereas 60 mg·L −1  AVG did not.

journal of the american society for horticultural science

Inhibition of Ethylene Biosynthesis and Associated Gene Expression by Aminoethoxyvinylglycine and 1-Methylcyclopropene and Their Consequences on Eating Quality and Internal Browning of ‘Starkrimson’ Pears