Novel insights on the structure and composition of pseudostomata of Sphagnum

American Journal of Botany
Amelia Merced

Abstract

• The occurrence of stomata on sporophytes of mosses and hornworts is congruent with a single origin in land plants. Although true stomata are absent in early-divergent mosses, Sphagnum has specialized epidermal cells, pseudostomata, that partially separate but do not open to the inside. This research examined two competing hypotheses that explain the origin of pseudostomata: (1) they are modified stomata, or (2) they evolved from epidermal cells independently from stomata.• Capsule anatomy and ultrastructure of pseudostomata were studied using light and electron microscopy, including immunolocalization of pectins.• Cell walls in pseudostomata are thin, two-layered, and rich in pectins, similar to young moss stomata, including the presence of cuticle on exterior walls. Outer and ventral walls have a thick cuticle that suggests that initial separation of ventral walls involves cuticle deposition as in true stomata. Further mechanical separation between ventral walls does not form a pore and occurs as the capsule dries.• As in moss stomata, pseudostomata wall architecture and behavior facilitate capsule dehydration, shape change, and dehiscence, supporting a common function. The divergent structure and fate of pseudostomata may b...Continue Reading

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Citations

Jan 18, 2017·Journal of Integrative Plant Biology·Frances C SussmilchScott A M McAdam
Dec 20, 2017·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Jeffrey G Duckett, Silvia Pressel
Nov 18, 2018·The New Phytologist·Frances C SussmilchRainer Hedrich
Oct 10, 2019·The Plant Journal : for Cell and Molecular Biology·Timothy J BrodribbScott A M McAdam
Jun 14, 2018·Annals of Botany·Silvia PresselJeffrey G Duckett
Jun 18, 2020·Frontiers in Plant Science·Karen S RenzagliaAmelia Merced
Jun 24, 2020·Seminars in Cell & Developmental Biology·Scott A M McAdam, Frances C Sussmilch
Mar 10, 2021·American Journal of Botany·Scott A M McAdamAmelia Merced

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