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Open AccessArticle

Lignin Accumulation in Three Pumelo Cultivars in Association with Sucrose and Energy Depletion

Guangdong Key Lab of Sugarcane Improvement & Biorefinery, Guangdong Provincial Bioengineering Institute (Guangzhou Sugarcane Industry Research Institute), Guangdong Academy of Sciences, Guangzhou 510316, China
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Biomolecules 2019, 9(11), 701; https://doi.org/10.3390/biom9110701
Received: 16 August 2019 / Revised: 28 October 2019 / Accepted: 31 October 2019 / Published: 5 November 2019
(This article belongs to the Section Biochemistry)
Lignification, which occurs in many horticultural fruit and vegetables, brings about undesirable texture and unfavorable consumer preference. However, this problem has rarely been studied. In this work, three pumelo cultivars cvs “Hongroumiyou” (HR), “Bairoumiyou” (BR), and “Huangroumiyou” (HuR) were stored at 25 °C for 90 days, and juice sacs were sampled to explore the lignin accumulation and its relationship to sucrose and energy depletion were investigated. The results displayed that HuR contained lower sucrose content, lower ATP level, but higher lignin content compared to BR and HR during postharvest storage, indicating that the sequence according to storage resistance on the basis of lignin content is as follows: HuR < BR < HR. Furthermore, sucrose degradation attributed to enhanced activities of neutral invertase (NI), soluble acid invertase (S-AI), cell wall-bound invertase (B-AI), and energy deficit on account of declined ATP level, showed significantly negative correlation with lignin accumulation, suggesting that lignin accumulation occurrence could induce sucrose degradation and energy deficit during postharvest storage. Additionally, higher activities of phenylalanine ammonia-lyase (PAL), polyphenol oxidase (PPO), peroxidase (POD) could accelerate lignin synthesis and resulted in lignin accumulation during postharvest pumelo storage. View Full-Text
Keywords: pummelo; lignin; ATP; sucrose; neutral invertase; soluble acid invertase; cell wall-bound invertase; phenylalanine ammonia-lyase pummelo; lignin; ATP; sucrose; neutral invertase; soluble acid invertase; cell wall-bound invertase; phenylalanine ammonia-lyase
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MDPI and ACS Style

Liu, J.; Huang, Q.; Kang, P.; Liang, L.; Chen, J. Lignin Accumulation in Three Pumelo Cultivars in Association with Sucrose and Energy Depletion. Biomolecules 2019, 9, 701.

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