期刊
PLANT PHYSIOLOGY AND BIOCHEMISTRY
卷 169, 期 -, 页码 92-101出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2021.11.008
关键词
Malus domestica; gamma-Aminobutyric acid; Polyamine; Ethylene; GABA shunt
资金
- National Natural Science Foundation of China [31801595]
- First-class Discipline Project of Liaoning Province [LNSPXKBD2020305]
The study demonstrates that exogenous GABA has significant effects on quality parameters, ethylene anabolism, polyamine metabolism, and GABA shunt in 'Golden Delicious' apples, helping to maintain fruit quality by suppressing unfavorable factors.
In this study, 'Golden Delicious' apples were dipped with gamma-aminobutyric acid (GABA) solution to investigate the changes of quality parameters, ethylene anabolism, polyamine metabolism and GABA shunt. Results showed that GABA distinctly suppressed respiratory rate, reduced titratable acidity, maintained higher soluble solid content and pericarp firmness of apples. Compared to the control, GABA also repressed the activities and gene expres-sions of polyamine oxidase (PAO) and diamine oxidase (DAO), enhanced MdMT, MdMS, MdSAMS, MdSAMDC, MdSPDS, MdODC, MdADC, and MdACL5 expressions, and accelerated the accumulation of putrescine, spermi-dine, and spermine in the exocarp of apples. Moreover, GABA decreased ethylene release, MdACS and MdACO gene expressions in the exocarp. In addition, exogenous GABA activated MdGAD, MdGDH, MdGS expressions and inhibited MdGABA-T and MdSSADH expressions in the GABA shunt, therefore increased endogenous GABA, pyruvic acid and glutamate contents in the exocarp. These findings suggest that exogenous GABA regulates ethylene anabolism, polyamine metabolism and GABA shunt to maintain fruit quality of 'Golden Delicious' apples.
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