Class III HD-Zip activity coordinates leaf development in Physcomitrella patens

Developmental Biology
Hoichong Karen YipJohn L Bowman

Abstract

Land plant bodies develop from meristems, groups of pluripotent stem cells, which may persist throughout the life of a plant or, alternatively, have a transitory existence. Early diverging land plants exhibit indeterminate (persistent) growth in their haploid gametophytic generation, whereas later diverging lineages exhibit indeterminate growth in their diploid sporophytic generation, raising the question of whether genetic machinery directing meristematic functions was co-opted between generations. Class III HD-Zip (C3HDZ) genes are required for the establishment and maintenance of shoot apical meristems in flowering plants. We demonstrate that in the moss Physcomitrella patens, C3HDZ genes are expressed in transitory meristems in both the gametophytic and sporophytic generations, but not in the persistent shoot meristem of the gametyphyte. Loss-of-function of P. patens C3HDZ was engineered using ectopic expression of miR166, an endogenous regulator of C3HDZ gene activity. Loss of C3HDZ gene function impaired the function of gametophytic transitory meristematic activity but did not compromise the functioning of the persistent shoot apical meristem during the gametophyte generation. These results argue against a wholesale co-op...Continue Reading

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Citations

Jul 8, 2016·The New Phytologist·Alejandra VascoBarbara A Ambrose
Sep 18, 2016·Developmental Biology·Daniel H Chitwood, Vivian F Irish
Oct 30, 2016·Journal of Experimental Botany·Prashanth RamachandranJ Peter Etchells
Dec 21, 2016·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·C Jill Harrison
Sep 13, 2016·Annual Review of Genetics·John L BowmanTom Dierschke
Oct 16, 2018·Frontiers in Plant Science·Frauke Augstein, Annelie Carlsbecker
Dec 29, 2020·The New Phytologist·Facundo Romani, Javier E Moreno
Oct 13, 2021·Current Biology : CB·Philip C J DonoghueHarald Schneider
Nov 24, 2021·Plant Reproduction·Cecilia Oliver, German Martinez

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