Our understanding of diatom reprodu

Our understanding of diatom reproduction is limited, especially
for marine planktonic centric diatoms. This project
aimed to elucidate sexual behavior and gametogenesis
in the mediophycean diatom, Thalassiosira angulata,
and to determine the fine structure of its reproductive
cells. A monoclonal culture of T. angulata was successfully
induced and enumerated, and all stages of auxosporulation
documented. Spermatogenesis was absent
in all inductions. Nuclear behavior of the auxospore
mother cell (AMC) during auxosporulation indicated that
reproduction was autogamic. In our clone, reproduction
began with a differentiating mitosis and subsequent pervalvar
expansion of the AMC, a meiocyte. The smaller
cell often continued normal vegetative growth. In the
AMC, meiosis I was acytokinetic and resulted in one viable
haploid and one pycnotic nucleus. Meiosis II resulted
in the production of two viable haploid nuclei, which we
postulate later fused to produce the zygotic nucleus. Cell
expansion was observed in very young AMCs both prior
to and following autosyngamy. The initial cell valves were
produced after at least two acytokinetic and pycnotic
mitotic divisions, after which the cell was capable of
undergoing its first normal mitosis involving production
of two sibling hypovalves.

ผลลัพธ์ (อังกฤษ) 2:

Reproduction is our understanding of diatom Limited, especially
for Marine planktonic diatoms Centric. This Project
aimed to Elucidate Sexual behavior and Gametogenesis
in the Mediophycean diatom, Thalassiosira angulata,
and to Determine the fine structure of ITS Reproductive
cells. A monoclonal Culture of T. angulata was successfully
induced and enumerated, and all Stages of Auxosporulation
documented. Spermatogenesis was absent
in all inductions. Nuclear behavior of the Auxospore
Mother Cell (AMC) during Auxosporulation Indicated that
was Autogamic Reproduction. In our Clone, Reproduction
began with a differentiating Mitosis and Subsequent Pervalvar
Expansion of the AMC, a Meiocyte. The smaller
Cell often Continued Normal vegetative growth. In the
AMC, meiosis I was Acytokinetic and resulted in one viable
haploid and one Pycnotic Nucleus. Meiosis II resulted
in the Production of Two viable haploid nuclei, which we
postulate later fused to Produce the Zygotic Nucleus. Cell
Expansion was observed in very Young AMCs both prior
to and following Autosyngamy. The initial Cell valves were
produced after at least Pycnotic Two Acytokinetic and
mitotic divisions, after which the Cell was Capable of
undergoing ITS Mitosis involving First Normal Production
of Two sibling Hypovalves.