Boiani L, Casanova G, Olivera A, Berois N
Sección Biología Celular, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay.
Tissue Cell. 2007 Aug;39(4):267-75. doi: 10.1016/j.tice.2007.05.001. Epub 2007 Aug 1.
Oligoryzomys flavescens, a common rodent of the temperate regions of South America, has been identified as a Hantavirus reservoir. There is still little information concerning its reproductive biology, which is essential to devise effective control measurement of natural populations. This rodent is a seasonal breeder and adult males exhibit a short period of testicular regression during winter months (June-August). In the present study we provided a histological and ultrastructural analysis of the composition of the testis of sexually mature O. flavescens during the breeding season. Over 95% of the testicular parenchyma was occupied by the seminiferous tubules and less than 5% by the interstitial tissue. The mean tubular diameter and epithelium height were 147.2 and 57.8 microm, respectively. The spermatogenic wave was characterized and eight spermatogenesis stages were identified according to the tubular morphology method. Their length, estimated as their relative frequencies, were (I-VIII) 8.8, 14.9, 4.0, 5.0, 10.4, 5.8, 27.0, and 23.9. Ultrastructural features of spermiogenesis are shown for the first time in a sigmodontine rodent.
黄腹鼠（Oligoryzomys flavescens）是南美洲温带地区常见的啮齿动物，已被确定为汉坦病毒的宿主。关于其生殖生物学的信息仍然很少，而这对于制定有效的自然种群控制措施至关重要。这种啮齿动物是季节性繁殖者，成年雄性在冬季月份（6月至8月）会出现短期的睾丸退化。在本研究中，我们对性成熟的黄腹鼠在繁殖季节的睾丸组成进行了组织学和超微结构分析。超过95%的睾丸实质由生精小管占据，间质组织占比不到5%。生精小管的平均直径和上皮高度分别为147.2微米和57.8微米。根据生精小管形态学方法对精子发生波进行了表征，并确定了八个精子发生阶段。它们的长度以相对频率估计，分别为（I - VIII）8.8、14.9、4.0、5.0、10.4、5.8、27.0和23.9。首次在稻鼠亚科啮齿动物中展示了精子形成的超微结构特征。
