There are 1 to 4 rows and five types of cortical alveoli in the cortex of the pallas(Hemibarbus labeo)egg.From the outer to the inner of the cortex,the diameter of the cortical alveoli decreases gradually.We found a n...There are 1 to 4 rows and five types of cortical alveoli in the cortex of the pallas(Hemibarbus labeo)egg.From the outer to the inner of the cortex,the diameter of the cortical alveoli decreases gradually.We found a new structure named solicitation speckle at the low latitude of the animal pole and near the micropylar apparatus between the ovum envelope and cell membrane in the zygote of fish.The solicitation speckle similar to type I cortical alveoli was very purple in H.E chromosome,and it had no obvious boundary with the ovum envelope and membrane.Moreover,no membrane around the solicitation speckle in TEM was found.In SEM,the solicitation speckle looked flocculent.During cortical reaction,the solicitation speckle played a very important function in arousing cortical reaction.Thirty-five seconds after fertilization,cortical alveoli began to break down near the low latitude of the animal pole.At the same time,the same thing happened near the micropylar apparatus before cortical reaction.Both starting points encountered and healed up at the vestibule of the micropylar apparatus.The cortical reaction that happened near the low latitude of the animal pole was another new pattern.The cortical reaction was divided into four parts that included latent period,developmental period,climactic period and declining period.In the latent period,no cortical alveoli were released.In the developmental period,a few cortical alveoli were released outside the cortex.In the climactic period,several cortical alveoli were inosculated into a big vesicle and released intensely.In the declining period,the type V cortical alveoli and the other remnant cortical alveoli were released.Five minutes after fertilization,cortical alveoli were released entirely in the animal pole.Five minutes after fertilization,all of the remnant cortical alveoli were released.This leads us to conclude that cortical reaction is induced by type I cortical alveoli,and the solicitation speckle is a volcanic chain reaction under water or the other lower osmotic pressure of fluids.The outer cortical reaction can accelerate the inner cortical reaction.While cortical alveoli releases in batches,the cell plasma membrane is reorganized over and over.No cortical alveoli were found below the micropylar tube where sperm enters the ovum,which suggests that the cortical reaction prevents polyspermy.展开更多
采用人工催产和干法授精技术,在ZOOM645S解剖镜下对花(Hemibarbus maculatus)(♀)×唇(H.labeo)(♂)杂交子一代(F1)胚胎发育过程中各发育时期的发育时序和形态特征进行了观察。结果表明,受精卵为强黏性卵,卵径为1.60～1.80 mm。在...采用人工催产和干法授精技术,在ZOOM645S解剖镜下对花(Hemibarbus maculatus)(♀)×唇(H.labeo)(♂)杂交子一代(F1)胚胎发育过程中各发育时期的发育时序和形态特征进行了观察。结果表明,受精卵为强黏性卵,卵径为1.60～1.80 mm。在孵化水温为(20±1)℃条件下,受精后1 h胚盘隆起;1 h20 min进入卵裂期;6 h 20 min进入桑椹期;8 h 20 min进入囊胚期;13 h 10 min进入原肠期;16 h 20min进入神经胚期;受精后18 h进入胚孔封闭期;21 h 30 min进入肌节出现期;27 h 20 min进入眼基出现期;28 h 40 min进入眼囊期;30 h 40 min进入尾芽期;32 h 30 min进入晶体出现期;34 h 40 min进入肌肉效应期;36 h 40 min进入耳石出现期;44 h进入心跳期;53 h 40 min进入眼色素形成期;60 h 40min进入血液循环期;68 h 30 min后开始出膜。杂交F1胚胎发育时序及形态特征均偏向母本花。展开更多
基金This paper was supported by Chongqing Scien-tific Committee Project(No.2001-6630)Three Gorges Reservoir Area Environmental Key Laboratory of Ministry of Education Fund(No.03121).
文摘There are 1 to 4 rows and five types of cortical alveoli in the cortex of the pallas(Hemibarbus labeo)egg.From the outer to the inner of the cortex,the diameter of the cortical alveoli decreases gradually.We found a new structure named solicitation speckle at the low latitude of the animal pole and near the micropylar apparatus between the ovum envelope and cell membrane in the zygote of fish.The solicitation speckle similar to type I cortical alveoli was very purple in H.E chromosome,and it had no obvious boundary with the ovum envelope and membrane.Moreover,no membrane around the solicitation speckle in TEM was found.In SEM,the solicitation speckle looked flocculent.During cortical reaction,the solicitation speckle played a very important function in arousing cortical reaction.Thirty-five seconds after fertilization,cortical alveoli began to break down near the low latitude of the animal pole.At the same time,the same thing happened near the micropylar apparatus before cortical reaction.Both starting points encountered and healed up at the vestibule of the micropylar apparatus.The cortical reaction that happened near the low latitude of the animal pole was another new pattern.The cortical reaction was divided into four parts that included latent period,developmental period,climactic period and declining period.In the latent period,no cortical alveoli were released.In the developmental period,a few cortical alveoli were released outside the cortex.In the climactic period,several cortical alveoli were inosculated into a big vesicle and released intensely.In the declining period,the type V cortical alveoli and the other remnant cortical alveoli were released.Five minutes after fertilization,cortical alveoli were released entirely in the animal pole.Five minutes after fertilization,all of the remnant cortical alveoli were released.This leads us to conclude that cortical reaction is induced by type I cortical alveoli,and the solicitation speckle is a volcanic chain reaction under water or the other lower osmotic pressure of fluids.The outer cortical reaction can accelerate the inner cortical reaction.While cortical alveoli releases in batches,the cell plasma membrane is reorganized over and over.No cortical alveoli were found below the micropylar tube where sperm enters the ovum,which suggests that the cortical reaction prevents polyspermy.
文摘采用人工催产和干法授精技术,在ZOOM645S解剖镜下对花(Hemibarbus maculatus)(♀)×唇(H.labeo)(♂)杂交子一代(F1)胚胎发育过程中各发育时期的发育时序和形态特征进行了观察。结果表明,受精卵为强黏性卵,卵径为1.60～1.80 mm。在孵化水温为(20±1)℃条件下,受精后1 h胚盘隆起;1 h20 min进入卵裂期;6 h 20 min进入桑椹期;8 h 20 min进入囊胚期;13 h 10 min进入原肠期;16 h 20min进入神经胚期;受精后18 h进入胚孔封闭期;21 h 30 min进入肌节出现期;27 h 20 min进入眼基出现期;28 h 40 min进入眼囊期;30 h 40 min进入尾芽期;32 h 30 min进入晶体出现期;34 h 40 min进入肌肉效应期;36 h 40 min进入耳石出现期;44 h进入心跳期;53 h 40 min进入眼色素形成期;60 h 40min进入血液循环期;68 h 30 min后开始出膜。杂交F1胚胎发育时序及形态特征均偏向母本花。
