克氏原螫虾大颚器在卵巢发育周期中的组织结构变化

STRUCTURAL CHANGES OF MANDIBULAR ORGAN DURING THE OVARY DEVELOPING CYCLE IN CRAYFISH

在克氏原螫虾的卵巢发育周期中，大颚器的组织结构呈现周期性变化：大颚器逐渐增大，颜色由白色透明变为淡土黄色；细胞数目增多，细胞直径和细胞间隙增大；基膜逐渐形成并增厚；颗粒血细胞逐渐增多。到卵黄发生期，大颚器的这些形态结构变化到达顶峰。产卵后大颚器细胞解体；随着卵巢的重新发育，大颚器也重新发育。同时，在卵巢发育周期中，卵黄发生期大颚器细胞直径与卵母细胞直径的线性关系最为显著，相关系数最大，r＝0．926；大颚器细胞直径也最大，与其它时期相比都具有极显著性差异。

During the ovary developing cycle in crayfish (Procambarus clarkii), the histological structures of mandibular organ(MO) show a cyclical change: MO grows bigger, and its color turns from pale to yellow. Cell number becomes more, cell diameter and cell space become larger. Basical membrance forms slowly and then grows thicker. Granular hemocytes become more and more. These histological structure changes of MO reach to the top at vitellogenesis stage. MO cells breakdown after spawning. With ovary re-developing next year, MO develops again. Meanwhile, at vitellogenesis stage, the linear relation between the diameter of MO cell and oocyte diameter is the most significant, and the correlation coefficient is the biggest, r = 0. 926. Moreover, the diameter of MO cell is the largest, there are significant differences between the diameter of MO cell at vitellogenesis stage and that of other stages of the ovary developing cycle.