Affiliation:
1. Institute of Pomology, Fujian Academy of Agricultural Sciences, Fuzhou 350000, China
Abstract
Granulation is a physiological disorder of juice sacs in citrus fruits, which develops through secondary cell wall formation. However, the synergistic changes in the cytoplasm of juice sac cells remain largely unknown. This study investigated the dynamic ultrastructure of juice sacs of “Guanxi” pummelo fruits by transmission electron microscopy and determined their cell wall material, soluble sugar, and organic acid contents. The results showed that lignin and hemicellulose are accumulated in juice sacs isolated from dorsal vascular bundles, while lignin and cellulose contribute to the granulation of juice sacs isolated from septal vascular bundles. The significant differences in lignin, cellulose, and hemicellulose contents between the two types of juice sacs began to be observed at 30 days of storage. Fructose levels were elevated in juice sacs isolated from the dorsal vascular bundles from 10 to 60 days. Sucrose contents significantly decreased in juice sacs isolated from the septal vascular bundles from 30 to 60 days. Meanwhile glucose, citric acid, and malic acid contents exhibited no apparent changes in both types of juice sacs. Based on the comprehensive analysis of the ultrastructure of both types of juice sacs, it was clearly found that plasma membrane ruptures induce cell wall material synthesis in intracellular spaces; however, cell wall substance contents did not significantly increase until the number of mitochondria sharply increased. In particular, sucrose contents began to decrease significantly just after the mitochondria amount largely increased in juice sacs isolated from the septal vascular bundles, indicating that mitochondria play a key role in regulating carbon source sugar partitioning for cell wall component synthesis.
Funder
Fujian Academy of Agricultural Sciences
Subject
Safety, Risk, Reliability and Quality,Food Science
Reference65 articles.
1. Characteristics of citrus fruits in relation to granulation
2. Influence of on-tree and cold storage on quality of Lane Late and Navelate oranges in Chile.
3. Anatomical observation on differentiation and granulation processes of juice sacs in Citrus grandis;Z. Y. Zhang;Acta Botanica Sinica,1999
4. Analysis of the reasons caused granulation of juice sacs in Guanximiyou pomelo variety;D. M. Pan;Journal of Fruit Science,1999
5. Relationship between granulation and materials of cell wall, polyamine in Huangguogan fruit;B. Xiong;Acta Agriculturae Boreali-Simica,2014
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