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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Sporoderm and tapetum development in Eupomatia laurina (Eupomatiaceae). An interpretation
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Sporoderm and tapetum development in Eupomatia laurina (Eupomatiaceae). An interpretation

机译：月桂叶Eupomatia laurina（Eupomatiaceae）的孢子皮和绒毡层发育。解释

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For the first time, the developmental events in the course of exine structure establishment have been traced in detail with TEM in Eupomatia, with the addition of cytochemical tests. A new look at unfolding events is suggested using our recent hypothesis on self-assembling micellar mesophases. The process proved to be unusual and includes “ghost” stages. The first units observed in the periplasmic space are spherical ones (= normal spherical micelles). These accumulate, resulting in a granular layer up to middle tetrad stage. Sporopollenin precursor accumulation on these units makes the ectexine layer looking as homogenous at late tetrad stage. Simultaneously, the columns of globules are added in the periplasmic space, which reminds an attempt to form columellae; but, the process failed. Instead, a fimbrillate endexine layer of compressed globules appears. The latter augments via additional globules, appearing in the periplasmic space in the free microspore period. The endexine formation is double-stepped spatially and temporally. The second, lamellate endexine layer (laminate micelles) appears late in development, when the channeled intine-I is already established—a very unusual feature. Moreover, a “fenestrated” stage comes unexpectedly at vacuolate stage, when hitherto amorphous ectexine appears pierced by cavernae—the results of reversal of normal spherical micelles (constituents of ectexine) to reverse the ones that open their cores for the entrance of hydrophilic nutrients from tapetum and give them over to the microspore cytoplasm by exchanging their solubilizates.
机译：首次通过透射电镜在Eupomatia中详细追踪了外在结构建立过程中的发育事件，并进行了细胞化学测试。使用我们最近关于自组装胶束中间相的假说，建议对发生的事件进行新的观察。该过程被证明是不寻常的，包括“幽灵”阶段。在周质空间中观察到的第一个单位是球形单位（=正常球形胶束）。这些积累，导致直到中间四级阶段的颗粒层。孢粉蛋白前体在这些单元上的积聚使四方后期的ectexine层看起来均匀。同时，在周质空间中添加了小球列，这提醒了人们尝试形成小肠的尝试。但是，该过程失败了。取而代之的是出现了压缩球状的纤维状内分泌层。后者通过在游离小孢子期的周质空间中出现的其他小球而增加。内啡肽的形成在空间和时间上是双重的。当已形成通道化的intine-I时，第二个层状内酯层（层状胶束）出现在发育后期，这是非常不寻常的功能。此外，空泡阶段出乎意料地出现了“开窗”阶段，当时迄今无定形的阿克西汀似乎被海绵刺穿了，这是正常球形胶束（阿克西汀的成分）逆转的结果，从而使那些为吸收亲水性养分而打开其核心的胶束逆转。绒毡层，并通过交换它们的溶解物将其交给小孢子细胞质。

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