Abstract
‘Gold Rush’ pear (Pyrus communis L.) is a russet-coloured fruit with soft buttery textured flesh and is gaining wide popularity in Australia and other countries along with other pear cultivars. The fruit are sensitive to ethylene, and exposure even at very low concentrations significantly reduces the storage duration as well as fruit quality during storage. The efficacy of two new ethylene antagonist compounds, namely, 1H-cyclopropabenzene (BC) and 1H-cyclopropa[b]naphthalene (NC), as well as 1-methylcyclopropene (1-MCP) in regulating ethylene production, respiration rates and maintaining the fruit quality of ‘Gold Rush' pear during 150 d and 200 d of controlled atmosphere (CA) storage (2.3 ± 0.5% O2 and 0.4 ± 0.15% CO2 and 0.50 ± 0.71 °C) was investigated. The pear fruit was fumigated with 1 µM BC (0.09 µL L−1) or 1 µM NC (0.14 µL L−1) or 18 µM 1-MCP (1 µL L−1) for 18 h at room temperature and the untreated fruit was considered as the control. Following 150 d and 200 d CA storage, the fruit fumigated with BC and NC exhibited significantly reduced ethylene and respiratory climacteric peak rates and they were lowest in the fruit treated with 1-MCP. The pear fruit fumigated with ethylene antagonists (BC, NC and 1-MCP) exhibited lower physiological loss of weight (PLW) (up to 2.06 times) and higher fruit firmness (up to 1.07 times) throughout the CA storage period, compared to the control fruit. The fruit fumigated with BC and NC had lower levels of SSC, glucose and sorbitol compared to other treatments. There was no significant effect of ethylene antagonist treatments on levels of individual organic acids, total phenols, ascorbic acid and total antioxidant capacity of the fruit pulp. Therefore, new ethylene antagonist compounds, BC and NC, exhibit the potential to act as ethylene antagonists in long-term CA-stored ‘Gold Rush’ pears to retard the fruit ripening process, extend storage life and maintain the fruit quality. The effectiveness of the different concentrations of BC and NC in suppressing ethylene production in different cultivars of pears warrants further investigation.
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Abbreviations
- BC:
-
1H-Cyclopropabenzene
- NC:
-
1H-Cyclopropa[b]naphthalene
- 1-MCP:
-
1-Methylcyclopropene
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Acknowledgements
V.Y. Tokala would like to thank the Australian Government and Curtin University for the Australian Government Research Training Program Scholarship (formerly known as International Postgraduate Research Scholarship) to pursue his PhD research program. Casuarina Valley Orchards, Beedelup, WA is gratefully acknowledged for providing the experimental fruit and access to CA storage facilities at Carmel, WA. The authors are obliged to Dr Alan D. Payne, for synthesising the BC, NC and 1-MCP and Ms Susan Petersen for the technical support provided during the experiment. The authors are thankful to Dr Satvinder Dhaliwal, Professor of Biostatistics, Curtin University for providing insights into the statistical analysis.
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VYT: Conceptualization, data curation, formal analysis, investigation, methodology, writing—original draft. ZS: Conceptualization, methodology, supervision, resources, writing—review and editing. PNK: Investigation, methodology, writing—review and editing.
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Tokala, V.Y., Singh, Z. & Kyaw, P.N. 1H-Cyclopropabenzene and 1H-Cyclopropa[b]naphthalene Fumigation Suppresses Climacteric Ethylene and Respiration Rates and Modulates Fruit Quality in Long-term Controlled Atmosphere-Stored ‘Gold Rush’ Pear Fruit. J Plant Growth Regul 40, 2276–2285 (2021). https://doi.org/10.1007/s00344-021-10387-2
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DOI: https://doi.org/10.1007/s00344-021-10387-2