Overexpression of Physcomitrium Patens Cell Cycle Regulators Leads to Larger Gametophytes

Overview

Journal Sci Rep

Specialty Science

Date 2023 Mar 16

PMID 36922580

Authors

Anantha Peramuna

Carmen Quinonero Lopez

Francisco Javier Astorga Rios

Hansol Bae

Jonatan Ulrik Fangel

Rituraj Batth

Jesper Harholt

Henrik Toft Simonsen

Affiliations

Soon will be listed here.

Abstract

Regulation of cell division is crucial for the development of multicellular organisms, and in plants, this is in part regulated by the D-type cyclins (CYCD) and cyclin-dependent kinase A (CDKA) complex. Cell division regulation in Physcomitrium differs from other plants, by having cell division checks at both the G1 to S and G2 to M transition, controlled by the CYCD1/CDKA2 and CYCD2/CDKA1 complexes, respectively. This led us to hypothesize that upregulation of cell division could be archived in Bryophytes, without the devastating phenotypes observed in Arabidopsis. Overexpressing lines of PpCYCD1, PpCYCD2, PpCDKA1, or PpCDKA2 under Ubiquitin promotor control provided transcriptomic and phenotypical data that confirmed their involvement in the G1 to S or G2 to M transition control. Interestingly, combinatorial overexpression of all four genes produced plants with dominant PpCDKA2 and PpCYCD1 phenotypes and led to plants with twice as large gametophores. No detrimental phenotypes were observed in this line and two of the major carbon sinks in plants, the cell wall and starch, were unaffected by the increased growth rate. These results show that the cell cycle characteristics of P. patens can be manipulated by the ectopic expression of cell cycle regulators.

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