图3. OTC处理前后Valencia组织横截面光学显微照片
A—F：初感染Valencia植株树干注射OTC前后对比图。其中A为处理前成熟叶片;B为处理后90 d成熟叶片;C为处理前嫩叶;D为处理后90 d嫩叶;E为处理前的茎;F为处理后90 d的茎。G—L：重度发病Valencia植株树干注射OTC前后对比图。其中G为处理前成熟叶片;H为处理后90 d成熟叶片;I为处理前嫩叶;J为处理后90 d嫩叶;K为处理前的茎;L为处理后90 d的茎。M—O：健康Valencia植株对照。其中M为健康老熟叶片;N为健康幼嫩叶片;O为健康的茎。非木质化/纤维素细胞壁染色为红色或紫色,胞浆蓝色,淀粉颗粒红黄色。蓝色箭头指示的蓝色点代表韧皮部堵塞,黄色箭头表示的红黄色颗粒代表淀粉。Co：皮层;P：韧皮部;Fi：纤维;Pi：髓;X：木质部

Fig. 3. Light micrographs of Valencia tissue cross sections before and after OTC treatment
A-F: Contrast charts of newly infected Valencia before and after OTC injection. Among them, A is the mature leaf before treatment; B is the mature leaf after treatment 90 days; C is the tender leaf before treatment; D is the tender leaf after treatment 90 days; E is the stem before treatment; F is the stem after treatment 90 days. G-L: Contrast charts of severely infected Valencia before and after OTC injection. Among them, G is the mature leaf before treatment; H is the mature leaf after treatment 90 days; I is the tender leaf before treatment; J is the tender leaf after treatment 90 days; K is the stem before treatment; L is the stem after treatment 90 days. M-O: Healthy Valencia plant control. Among them, M is healthy mature leaf; N is healthy young leaf; O is healthy stem. Non-lignified/cellulose cell walls are stained red or purple, cytoplasm blue, and starch granules reddish yellow. The blue spots indicated by blue arrows represent phloem plugging. The reddish yellow granules indicated by yellow arrows represent starch. Co: Cortex; Fi: Fiber; P: Phloem; Pi: Pith; X: Xylem