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Acta Horticulturae Sinica ›› 2021, Vol. 48 ›› Issue (5): 973-986.doi: 10.16420/j.issn.0513-353x.2020-0586

• Research Papers • Previous Articles     Next Articles

Soluble Sugar,Organic Acid Quality and Volatile Compounds Contents in Tomato Fruits can be Promoted by Exogenous ALA

WANG Junwen1, WU Yue1,*(), YU Jihua1,2,*(), ZHANG Jing1, XIE Jianming1, FENG Zhi1, TANG Zhongqi1, LIU Xiaoqi1, LI Jing1, ZHONG Yuan2   

  1. 1College of Horticulture,Gansu Agricultural University,Lanzhou 730070,China
    2Gansu Provincial Key Laboratory of Aridland Crop Science,Lanzhou 730070,China
  • Received:2020-07-27 Revised:2020-09-01 Online:2021-05-25 Published:2021-06-07
  • Contact: WU Yue,YU Jihua E-mail:wuy@gsau.edu.cn;yujihua@gsau.edu.cn

Abstract:

The overall objective of this research was to explore the effects of exogenous 5-Aminolevulinic acid(ALA)on the flavor quality of tomato fruit. Tomato(Solanum lycopersicum‘Yuanwei 1’)fruits were applied with different concentration of ALA(0,100 and 200 mg·L-1)being daubed on the surface at the mature green fruit stage. The soluble sugars,organic acids and volatile compounds were determined during maturation of tomato fruits. The results indicated that 200 mg·L -1 exogenous ALA promoted the maturity of tomato fruits,advanced the tomato fruits maturation period by 4 days,and significantly increased the content of fructose,glucose and total soluble sugar in tomato fruits. Meanwhile,the tartaric acid,citric acid,oxalic acid,quinic acid,shikimic acid and total organic acid content were significantly reduced through the application of 200 mg·L-1 exogenous ALA,thereby,the sugar acid ratio of the tomato fruits increased markedly. 96 volatile compounds were detected in tomato fruits,including 35 alcohols,25 aldehydes,12 hydrocarbons,nine ketones,six esters,five phenols and four other compounds. The content of volatile compounds in 0(control),100 and 200 mg·L -1ALA treatment were:1 065.72,1 478.60 and 2 374.50 µg·kg -1. The total contents of alcohols,aldehydes,hydrocarbons,ketones,esters,phenols and other compounds in tomato fruits were significantly increased by 200 mg·L -1 ALA,while the species of alcohols,ketones,hydrocarbons and other substances were increased by 100 mg·L -1 ALA. Ten characteristic volatile compounds were detected in tomato fruits,among which 200 mg·L -1 ALA treatment had the highest content(1 074.78 µg·kg -1). In conclusion,applying an appropriate concentration of exogenous ALA(200 mg·L -1)during maturation of tomato not only enhance the flavor quality of the fruits,but also advance the tomato fruits maturation period.

Key words: tomato, fruit, exogenous 5-aminolevulinic acid, soluble sugars and organic acids, volatile compounds, gas chromatography-mass spectrometry(GC-MS)

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