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. 2021 Mar 31;12:643971. doi: 10.3389/fpls.2021.643971

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Copyright © 2021 Duan, Li, Zhang, Cheng, Liu, Li, Zhou and Chen.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Starch accumulation on HLB-infected citrus leave and was reduced after FOS and CAC treatment. (A) TEM images of citrus leaves. A1: healthy leaves; A2: HLB-infected leaves. (B) PAS and phenol yellows dyeing of citrus leaves. B1: healthy leaves; B2: HLB-infected leaves. (C) The secretory tissues of citrus leaves in partial enlargement of (B). C1: healthy leaves; C2: HLB-infected leaves. (D) The changes of starch accumulation during FOS + CAC combination treatment 90 days. Asterisk indicates significant differences during FOS + CAC combination treatment 90 days (Student's t-test, *p < 0.05, ***p < 0.001), ns indicated no significant differences.