Physiological and Ultrastructural Alterations Linked to Intrinsic Mastication Inferiority of Segment Membranes in Satsuma Mandarin (Citrus unshiu Marc.) Fruits

文献类型： 外文期刊

第一作者： Lian, Xuefei

作者： Lian, Xuefei;Chang, Yuanyuan;Zhou, Tie;Chen, Yuewen;Yin, Tao;Li, Yunsong;Ye, Li;Jin, Yan;Lu, Xiaopeng;Lian, Xuefei;Chang, Yuanyuan;Zhou, Tie;Chen, Yuewen;Yin, Tao;Li, Yunsong;Ye, Li;Jin, Yan;Lu, Xiaopeng;Li, Feifei

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关键词： Satsuma mandarin; intrinsic mastication inferiority; segment membrane; pectin; gene expression

期刊名称：PLANTS-BASEL （ 影响因子：4.658； 五年影响因子：4.827 ）

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年卷期： 2022 年 11 卷 1 期

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收录情况： SCI

摘要： Chewing texture is important for fresh citrus fruits, and the mastication trait of a segment directly determines chewing texture. Roughing disorder impairs the quality of Satsuma mandarin fruits, and it is typically correlated with intrinsic mastication inferiority (IMI). This study explored the role of segment membranes (SMs) in IMI. Similar to IMI in roughing-disordered fruits, segment shear force significantly enhanced relative to controls (CK); cell layers and cell wall thickness increased also in inferior masticating SMs. The 'Miyamoto Wase' cultivar exhibited larger segment shear force and more SM cell layers than 'Juxiangzao'. In SMs, vessel cells could be divided into outside layers where segments adjoin and inside layers where juice sacs grow from. The inside vessel cell layers in the inferior masticating SMs were denser. Vessels with a length of 200 to 300 mu m and a diameter of 5 to 15 mu m predominated in SMs. The average vessel diameter enlarged by 13% to 16.5% in inferior masticating SMs, depending on cultivars. Furthermore, there was a decrease in vessels with a diameter 10 mu m in the inferior masticating SMs. Between phenotypes, protopectin increased significantly throughout development of inferior masticating SMs, while water-soluble pectin increased during the later stages of development. In one inferior masticating SM sample, protopectin and water-soluble pectin levels were higher in the inner-ring area than those in the outer-ring area. Correspondingly, expression of CuPME21 which is involved in pectin hydrolysis was consistently upregulated in the inferior masticating SMs throughout fruit development. The findings in this work provide novel insights into citrus SM structure and its IMI.

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