Coleochaete and the origin of sporophytes

American Journal of Botany
David Haig

Abstract

• Zygotes of Coleochaete are provisioned by the maternal thallus before undergoing 3-5 rounds of division to produce 8-32 zoospores. An understanding of the selective forces favoring postzygotic divisions would be relevant not only to the interpretation of Coleochaete life history but also to the origin of a multicellular diploid phase in embryophytes.• Simple optimization models are developed of the number of zygotes per maternal thallus and number of zoospores per zygote.• Zygotic mitosis is favored once zygotic size exceeds a threshold, but natural selection usually promotes investment in additional zygotes before zygotes reach this threshold. Factors that favor production of fewer, larger zygotes include multiple paternity, low fecundity, and accessory costs of zygote production. Such factors can result in zygotes exceeding the size at which zygotic mitosis becomes profitable.• Coleochaete may possess large zygotes that undergo multiple fission because of accessory costs associated with matrotrophy, including costs of cortical cells and unfertilized oogonia. The unpredictability of fertilization on land is proposed to have increased accessory costs from unfertilized ova and, as a consequence, to have favored the production ...Continue Reading

References

Jul 25, 2000·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·L K Graham, L W Wilcox
Apr 15, 2006·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·David Haig, Amity Wilczek
Oct 30, 2009·The New Phytologist·Karl J Niklas, Ulrich Kutschera
Dec 24, 2013·American Journal of Botany·Karl J Niklas
Jan 21, 2014·Journal of Experimental Botany·Kateřina Bišová, Vilém Zachleder
Oct 18, 2014·Cold Spring Harbor Perspectives in Biology·James G Umen

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Citations

Mar 6, 2016·American Journal of Botany·Jeffrey P RoseKenneth J Sytsma
Jan 10, 2019·Journal of Computational Biology : a Journal of Computational Molecular Cell Biology·Yuandi WangNanjun Yan

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