Loss of Plastid Developmental Genes Coincides With a Reversion to Monoplastidy in Hornworts.
Authors
MacLeod, Alexander I
Raval, Parth K
Stockhorst, Simon
Knopp, Michael R
Frangedakis, Eftychios
Gould, Sven B
Publication Date
2022Journal Title
Front Plant Sci
ISSN
1664-462X
Publisher
Frontiers Media SA
Volume
13
Language
en
Type
Other
This Version
VoR
Metadata
Show full item recordCitation
MacLeod, A. I., Raval, P. K., Stockhorst, S., Knopp, M. R., Frangedakis, E., & Gould, S. B. (2022). Loss of Plastid Developmental Genes Coincides With a Reversion to Monoplastidy in Hornworts.. [Other]. https://doi.org/10.3389/fpls.2022.863076
Abstract
The first plastid evolved from an endosymbiotic cyanobacterium in the common ancestor of the Archaeplastida. The transformative steps from cyanobacterium to organelle included the transfer of control over developmental processes, a necessity for the host to orchestrate, for example, the fission of the organelle. The plastids of almost all embryophytes divide independently from nuclear division, leading to cells housing multiple plastids. Hornworts, however, are monoplastidic (or near-monoplastidic), and their photosynthetic organelles are a curious exception among embryophytes for reasons such as the occasional presence of pyrenoids. In this study, we screened genomic and transcriptomic data of eleven hornworts for components of plastid developmental pathways. We found intriguing differences among hornworts and specifically highlight that pathway components involved in regulating plastid development and biogenesis were differentially lost in this group of bryophytes. Our results also confirmed that hornworts underwent significant instances of gene loss, underpinning that the gene content of this group is significantly lower than other bryophytes and tracheophytes. In combination with ancestral state reconstruction, our data suggest that hornworts have reverted back to a monoplastidic phenotype due to the combined loss of two plastid division-associated genes, namely, ARC3 and FtsZ2.
Keywords
Plant Science, plastid evolution, bryophytes, hornworts, plant terrestrialization, plastid division
Identifiers
External DOI: https://doi.org/10.3389/fpls.2022.863076
This record's DOI: https://doi.org/10.17863/CAM.82935
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/
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