图3 裂溶生间隙——柑橘属植物果实分泌腔形成示意图(Chen and Wu, 2010; Liu et al., 2012)(A) 原始细胞期, 分泌腔几个中央细胞核大, 质浓厚; (B) 腔隙形成期(分泌细胞分化期), 分泌腔中央细胞中层溶解, 胞间隙形成, 同时中央细胞开始液泡化, 核膜破毁, 胞质稀疏; (C) 腔隙扩大期(分泌细胞降解期), 随着中央细胞中层的溶解和周围细胞侵入生长, 以及几个中央细胞的自溶破毁, 腔隙进一步扩大; (D) 成熟分泌腔, 1层上皮细胞和2-3层鞘细胞围绕腔道形成的成熟分泌腔。
Figure 3 The formation of schizolysigenous space of secretory cavity in fruit of Citrus (Chen and Wu, 2010; Liu et al., 2012)(A) Showing initial cells stage of secretory cavity with large nucleus and dense cytoplasm; (B) Showing intercellular space- forming stage (differentiation stage of secretory cell), the middle lamellar of central cells of secretory cavity dissolved to form intercellular space, in the meantime, the central cells are characterized by evident vacuolization, broken nuclear membranes, and disorganized cytoplasm; (C) Showing intercellular space-expending stage (degenerating stage of secretory cell), the middle lamellar of central cells of secretory cavity continued to dissolve and the surrounded cells were intrusive growth to enlarge the intercellular space, meanwhile the central cells are apoptosis and broken, the lumen is further enlarged; (D) Showing mature secretory cavity with 1 layer of functional epithelial cells and 2–3 layers of sheath cells around the outside of epithelial cells.