Analysis of structure feature of granulated juice sacs in Citrus grandis'Sanhongmiyou'fruits
Granulation of juice sacs is the main cause for quality decline in pomelo(Citrus grandis)fruits.To investigate the structural feature and differences in the lignification degree of juice sacs in different parts of fruit,and differences in the lignification degree of different tissue,pomelo fruits harvested in Pinghe County,Fujian Province in late September and stored in the room temperature for one month were used as test material to analyze the structure feature of the juice sacs in different parts of fruit and evaluate the lignification degree a-mong juice sacs in different parts of fruit and different internal tissues within juice sacs.The results showed that there were two permutation types for juice sacs in pomelo fruits,including vertical and transversal permu-tation,which differed in quality characteristics and degree of granulation.Based on the results from both in si-tu staining and quantitative analysis,it was found that the vertical juice sacs(Jv)were more vulnerable to lig-nification,whose lignin concentration was 5.11±2.26 times that of transversal juice sacs(Jt).By analyzing the anatomical structure of granulated juice sacs,it was found that the simple tissues in Jv were more vulnera-ble to lignification with 79.95±23.00 times higher lignin concentration than that of in the lumen,and most of lignin was accumulated in sclerenchyma of simple tissues.The results laid a foundation for further analysis of the mechanism of granulation of juice sac in pomelo fruits.
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