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• W2019105844 abstract "Auxosporulation of the freshwater epipelic diatom Pinnularia nodosa (Ehrenb.) W. Sm. was studied in a clonal culture. Interphase cells possessed two chloroplasts with invaginated pyrenoids. The nucleus contained a single small body of heterochromatin at one end, also visible during most of meiotic prophase. During auxosporulation, induced by transfer of stationary‐phase cells to fresh medium and suppressed by high nitrogen (N), an unpaired mother cell produced a single auxospore. Although meiosis II and nuclear fusion were not observed, indirect evidence indicated that auxosporulation was autogamous (rarely reported in pennate diatoms), rather than apomictic; paedogamy was excluded. The protoplast produced after meiosis either (1) matured into a “pseudozygote,” via an asymmetrical contraction after meiosis I to form a single spherical cell at one end of the mother cell (pathway 1); or (2) constricted into two spherical cells (pathway 2). In pathway 2, the “pseudogametes” never fused and only one or none developed into a pseudozygote and then into an auxospore. Pathway 2 could be suppressed by continuous light. During metamorphosis of the spherical pseudozygote into an elongate young auxospore, a complete covering of thin siliceous incunabular strips was formed, separate from the organic wall formed around the pseudozygote when first formed and from the perizonium. Mature auxospores produced via pathway 2 had 60% of the volume as those produced via pathway 1 and had smaller chloroplasts (through loss of fragments during protoplast cleavage), but they achieved exactly the same lengths, suggesting that absolute length is monitored during expansion." @default.
• W2019105844 created "2016-06-24" @default.
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• W2019105844 date "2008-03-19" @default.
• W2019105844 modified "2023-10-16" @default.
• W2019105844 title "AUTOGAMOUS AUXOSPORULATION IN<i>PINNULARIA NODOSA</i>(BACILLARIOPHYCEAE)" @default.
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• W2019105844 doi "https://doi.org/10.1111/j.1529-8817.2008.00475.x" @default.
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