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Preharvest GA3 treatment at optimized time points enhanced the storability of 'Shixia' longan fruit

文献类型： 外文期刊

作者： Luo, Tao 1 ; Long, Libing 1 ; Lai, Tingting 1 ; Lin, Xiaolan 1 ; Ning, Chenning 1 ; Lai, Ziying 1 ; Du, Xinxin 1 ; Shuai, Liang 4 ; Han, Dongmei 2 ; Wu, Zhenxian 1 ;

作者机构： 1.South China Agr Univ, Coll Hort, Guangdong Prov Key Lab Postharvest Sci Fruits & Ve, Engn Res Ctr Southern Hort Prod Preservat,Minist E, Guangzhou 510642, Peoples R China

2.Guangdong Acad Agr Sci, Inst Fruit Tree Res, Minist Agr, Key Lab South Subtrop Fruit Biol & Genet Resource, Guangzhou 510640, Peoples R China

3.South China Agr Univ, Coll Hort, Key Lab Biol & Genet Improvement Hort Crops South, Minist Agr & Rural Affairs, Guangzhou 510642, Peoples R China

4.Nanchang Normal Univ, Coll Chem & Food Sci, Nanchang 330032, Jiangxi, Peoples R China

关键词： Longan(Dimocarpus longan Lour.) fruit; Preharvest GA3 treatment; Storability; Pericarp browning; Plant hormone

期刊名称：POSTHARVEST BIOLOGY AND TECHNOLOGY （ 影响因子：7.0； 五年影响因子：6.9 ）

ISSN： 0925-5214

年卷期： 2024 年 214 卷

页码：

收录情况： SCI

摘要： The effects of 50 mg L-1 GA3 spraying at 65+75 days after flowering (DAF) (GA3_a), 75+85 DAF (GA3_b) and 85+95 DAF (GA3_c) on the room-temperature storability were compared to screen the ideal treatment timepoints. GA3_b significantly inhibited the increasing of mass loss, rotting, aril breakdown, electrolyte leakage and pericarp browning. More importantly, GA3_b enhanced ROS-scavenging capacity through up-regulating activities of PAL (phenylalanine ammonia-lyase), CAT (catalase) and APX (ascorbate peroxidase), therefore reduced H2O2 and malondialdehyde, retained phenolics, chlorophylls and carotenoid in pericarp at the later storage stages. GA3_b significantly inhibited pericarp enzymatic-browning by down-regulating expression and activities of POD (peroxidase), PPO (polyphenol oxidase) and LAC (laccase) and postharvest flavan-3-ols' polymerization. Moreover, GA3_b up-regulated GA3, SA and MeJA content at ripening & earlier storage, inhibited ABA biosynthesis at 85 DAF, up-regulated postharvest expression of NCED (9-cis-epoxycarotenoid dioxygenase), ABF (Abscisic acid-insensitive 5-like protein), NPR1 (non-expresser of pathogenesis related [PR] 1) expression but down-regulated PR1 (pathogen-related protein 1) and might promote survival of pericarp cell. In summary, 50 mg L-1 GA3 spraying at 75+85 DAF was an ideal treatment to effectively improved the storability of longan fruit through enhancing ROS-scavenging capacity, inhibiting enzymatic-browning and promoting the survival of pericarp cell by reprogramming phytohormone.

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