Near-freezing temperature (NFT) storage alleviates chilling injury by enhancing antioxidant metabolism of postharvest guava (Psidium guajava L.)

•NFT storage alleviated chilling injury of postharvest guava.•Guava stored at NFT showed compact cell structure and higher cell integrity.•NFT storage promoted antioxidant capacity and activities of CAT, SOD, POD.•NFT storage induced expression of APX, MDHAR, GR and activated ASA-GSH cycle. The effe...

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Bibliographic Details
Published in:Scientia horticulturae 2022-11, Vol.305, p.111395, Article 111395
Main Authors: Xiao, Jiaqi, Gu, Caiqin, Zhu, Dongxue, Chao, Haijing, Liang, Yongyi, Quan, Shiting
Format: Article
Language:English
Subjects:
ASA-GSH cycle
ascorbic acid
catalase
cell membranes
Chilling index
glutathione
Guava
guavas
hydrogen peroxide
malondialdehyde
membrane permeability
metabolism
NFT storage
peroxidase
Psidium guajava
Reactive oxygen metabolism
superoxide anion
superoxide dismutase
temperature
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Summary:•NFT storage alleviated chilling injury of postharvest guava.•Guava stored at NFT showed compact cell structure and higher cell integrity.•NFT storage promoted antioxidant capacity and activities of CAT, SOD, POD.•NFT storage induced expression of APX, MDHAR, GR and activated ASA-GSH cycle. The effects of near-freezing temperature (NFT) storage on chilling injury and antioxidant metabolism of postharvest guava were investigated in comparison with 6 °C and 10 °C storage. NFT storage showed significant inhibition effects on guava chilling injury occurrence, increment in cell membrane permeability and malondialdehyde accumulation, and contributed to compact and well-organized cell structure at the end of storage. Besides, remarkable enhancements in radical scavenging activities (DPPH, ABTS), ascorbic acid (ASA) and glutathione (GSH) contents, and activities of catalase (CAT), superoxide dismutases (SOD), peroxidase (POD) and the ASA-GSH cycle-related enzymes were observed in NFT group, leading to the elimination of excessive hydrogen peroxide (H2O2) and superoxide anion (O2−.). Further investigation of expression levels of genes related to the ASA-GSH cycle confirmed that NFT induced the transcriptions of PguAPX2, PguMDHAR1, PguMDHAR3, PguGR1 and PguGR2, and activated antioxidant related enzymes, alleviating cell membrane damage and cell disintegration during storage, thus inhibiting chilling injury of guava.
ISSN:0304-4238
1879-1018
DOI:10.1016/j.scienta.2022.111395