Abstract
Key message
γ-Decalactone accumulation in peach mesocarp was highly correlated with ACX enzyme activity and natural PpACX1 content. Adding the purified recombinant PpACX1 induced γ-decalactone biosynthesis in cultured mesocarp discs in vitro.
Abstract
Previous gene expression studies have implied that acyl coenzyme A oxidase (ACX) is related to lactones synthesis, the characteristic aroma compounds of peach. Here, we analysed the correlation between γ-decalactone content and ACX enzyme activity in mesocarp of five different types of fully ripe peach varieties. Furthermore, ‘Hu Jing Mi Lu’ (‘HJ’) and ‘Feng Hua Yu Lu’ (‘YL’), which have strong aroma among them, at four ripening stages were selected to study the role of ACX in lactone biosynthesis. The result showed that γ-decalactone was the most abundant lactone compound. γ-Decalactone accumulation was highly correlated with ACX enzyme activity. Mass spectrometry (MS) showed that PpACX1 was the most abundant PpACX protein in fully ripe mesocarp of cv. ‘HJ’. To further elucidate the function of the PpACX1 protein, the PpACX1 gene was heterologously expressed in a bacterial system and characterized in vitro. MS identification gave the molecular weight of the recombinant PpACX1 as 94.44 kDa and the coverage rate of the peptide segments was 47.3%. In cultured mesocarp discs in vitro, adding the purified recombinant PpACX1 and C16-CoA substrate induced the expected γ-decalactone biosynthesis. Using a sandwich ELISA based on mixed mono- and polyclonal antibodies against recombinant PpACX1, PpACX1 content in mesocarp was found to be highly correlated with γ-decalactone accumulation in mesocarp of five fully ripe varieties and four ripening stages of ‘HJ’ and ‘YL’. This study revealed the vital function of PpACX1 in γ-decalactone biosynthesis in peach fruit.
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Abbreviations
- ACX:
-
Acyl coenzyme A oxidase
- BSA:
-
Bovine serum albumin
- ELISA:
-
Enzyme-linked immunosorbent assay
- ETH:
-
Ethephon
- FW:
-
Fresh weight
- GC–MS:
-
Gas chromatography–mass spectrometry
- HJ:
-
Hu Jing Mi Lu
- IPTG:
-
Isopropyl-beta-d-thiogalactopyranoside
- LB:
-
Luria–Bertani
- mAbs:
-
Monoclonal antibodies
- MS:
-
Mass spectrometry
- pAbs:
-
Polyclonal antibodies
- qPCR:
-
Real-time quantitative polymerase chain reaction
- RT-PCR:
-
Reverse transcription PCR
- SE:
-
Standard error
- TG:
-
Tai Gu Rou Tao
- TSS:
-
Total soluble solids
- μ HPLC:
-
Capillary electrophoresis and high performance liquid chromatography
- YL:
-
Feng Hua Yu Lu
- ZH:
-
Zhong Hua Shou Tao
- ZN16:
-
Zhong Nectarine 16
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Acknowledgements
This study was funded by the National Science Foundation of China (31372040, 31401833), the State Ministry of Science and Technology of China (International Cooperation 1114), the Key Project for New Agricultural Cultivar Breeding in Zhejiang Province, China (2016C02052-5) and the Chinese Postdoctoral Science Foundation (2014M551753).
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Communicated by Kathryn K. Kamo.
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Zhang, L., Li, H., Gao, L. et al. Acyl-CoA oxidase 1 is involved in γ-decalactone release from peach (Prunus persica) fruit. Plant Cell Rep 36, 829–842 (2017). https://doi.org/10.1007/s00299-017-2113-4
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DOI: https://doi.org/10.1007/s00299-017-2113-4