A conserved regulatory mechanism mediates the convergent evolution of plant shoot lateral organs.
Land plant shoot structures evolved a diversity of lateral organs as morphological adaptations to the terrestrial environment, with lateral organs arising independently in different lineages. Vascular plants and bryophytes (basally diverging land plants) develop lateral organs from meristems of spor...
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doaj-ee6d2e2197be4b128dc74ce3a25a97062021-07-02T16:26:48ZengPublic Library of Science (PLoS)PLoS Biology1544-91731545-78852019-12-011712e300056010.1371/journal.pbio.3000560A conserved regulatory mechanism mediates the convergent evolution of plant shoot lateral organs.Satoshi NaramotoVictor Arnold Shivas JonesNicola TrozziMayuko SatoKiminori ToyookaMasaki ShimamuraSakiko IshidaKazuhiko NishitaniKimitsune IshizakiRyuichi NishihamaTakayuki KohchiLiam DolanJunko KyozukaLand plant shoot structures evolved a diversity of lateral organs as morphological adaptations to the terrestrial environment, with lateral organs arising independently in different lineages. Vascular plants and bryophytes (basally diverging land plants) develop lateral organs from meristems of sporophytes and gametophytes, respectively. Understanding the mechanisms of lateral organ development among divergent plant lineages is crucial for understanding the evolutionary process of morphological diversification of land plants. However, our current knowledge of lateral organ differentiation mechanisms comes almost entirely from studies of seed plants, and thus, it remains unclear how these lateral structures evolved and whether common regulatory mechanisms control the development of analogous lateral organs. Here, we performed a mutant screen in the liverwort Marchantia polymorpha, a bryophyte, which produces gametophyte axes with nonphotosynthetic scalelike lateral organs. We found that an Arabidopsis LIGHT-DEPENDENT SHORT HYPOCOTYLS 1 and Oryza G1 (ALOG) family protein, named M. polymorpha LATERAL ORGAN SUPRESSOR 1 (MpLOS1), regulates meristem maintenance and lateral organ development in Marchantia. A mutation in MpLOS1, preferentially expressed in lateral organs, induces lateral organs with misspecified identity and increased cell number and, furthermore, causes defects in apical meristem maintenance. Remarkably, MpLOS1 expression rescued the elongated spikelet phenotype of a MpLOS1 homolog in rice. This suggests that ALOG genes regulate the development of lateral organs in both gametophyte and sporophyte shoots by repressing cell divisions. We propose that the recruitment of ALOG-mediated growth repression was in part responsible for the convergent evolution of independently evolved lateral organs among highly divergent plant lineages, contributing to the morphological diversification of land plants.https://doi.org/10.1371/journal.pbio.3000560 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Satoshi Naramoto Victor Arnold Shivas Jones Nicola Trozzi Mayuko Sato Kiminori Toyooka Masaki Shimamura Sakiko Ishida Kazuhiko Nishitani Kimitsune Ishizaki Ryuichi Nishihama Takayuki Kohchi Liam Dolan Junko Kyozuka |
spellingShingle |
Satoshi Naramoto Victor Arnold Shivas Jones Nicola Trozzi Mayuko Sato Kiminori Toyooka Masaki Shimamura Sakiko Ishida Kazuhiko Nishitani Kimitsune Ishizaki Ryuichi Nishihama Takayuki Kohchi Liam Dolan Junko Kyozuka A conserved regulatory mechanism mediates the convergent evolution of plant shoot lateral organs. PLoS Biology |
author_facet |
Satoshi Naramoto Victor Arnold Shivas Jones Nicola Trozzi Mayuko Sato Kiminori Toyooka Masaki Shimamura Sakiko Ishida Kazuhiko Nishitani Kimitsune Ishizaki Ryuichi Nishihama Takayuki Kohchi Liam Dolan Junko Kyozuka |
author_sort |
Satoshi Naramoto |
title |
A conserved regulatory mechanism mediates the convergent evolution of plant shoot lateral organs. |
title_short |
A conserved regulatory mechanism mediates the convergent evolution of plant shoot lateral organs. |
title_full |
A conserved regulatory mechanism mediates the convergent evolution of plant shoot lateral organs. |
title_fullStr |
A conserved regulatory mechanism mediates the convergent evolution of plant shoot lateral organs. |
title_full_unstemmed |
A conserved regulatory mechanism mediates the convergent evolution of plant shoot lateral organs. |
title_sort |
conserved regulatory mechanism mediates the convergent evolution of plant shoot lateral organs. |
publisher |
Public Library of Science (PLoS) |
series |
PLoS Biology |
issn |
1544-9173 1545-7885 |
publishDate |
2019-12-01 |
description |
Land plant shoot structures evolved a diversity of lateral organs as morphological adaptations to the terrestrial environment, with lateral organs arising independently in different lineages. Vascular plants and bryophytes (basally diverging land plants) develop lateral organs from meristems of sporophytes and gametophytes, respectively. Understanding the mechanisms of lateral organ development among divergent plant lineages is crucial for understanding the evolutionary process of morphological diversification of land plants. However, our current knowledge of lateral organ differentiation mechanisms comes almost entirely from studies of seed plants, and thus, it remains unclear how these lateral structures evolved and whether common regulatory mechanisms control the development of analogous lateral organs. Here, we performed a mutant screen in the liverwort Marchantia polymorpha, a bryophyte, which produces gametophyte axes with nonphotosynthetic scalelike lateral organs. We found that an Arabidopsis LIGHT-DEPENDENT SHORT HYPOCOTYLS 1 and Oryza G1 (ALOG) family protein, named M. polymorpha LATERAL ORGAN SUPRESSOR 1 (MpLOS1), regulates meristem maintenance and lateral organ development in Marchantia. A mutation in MpLOS1, preferentially expressed in lateral organs, induces lateral organs with misspecified identity and increased cell number and, furthermore, causes defects in apical meristem maintenance. Remarkably, MpLOS1 expression rescued the elongated spikelet phenotype of a MpLOS1 homolog in rice. This suggests that ALOG genes regulate the development of lateral organs in both gametophyte and sporophyte shoots by repressing cell divisions. We propose that the recruitment of ALOG-mediated growth repression was in part responsible for the convergent evolution of independently evolved lateral organs among highly divergent plant lineages, contributing to the morphological diversification of land plants. |
url |
https://doi.org/10.1371/journal.pbio.3000560 |
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