ATHB2 is a negative regulator of germination in Arabidopsis thaliana seeds

Abstract The germination timing of seeds is of the utmost adaptive importance for plant populations. Light is one of the best characterized factors promoting seed germination in several species. The germination is also finely regulated by changes in hormones levels, mainly those of gibberellin (GA)...

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Autores principales:	Tognacca Rocío Soledad, Carabelli Monica, Morelli Giorgio, Ruberti Ida, Botto Javier Francisco
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/82da4b4ef1a24933a0abadb0411f62da
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spelling	oai:doaj.org-article:82da4b4ef1a24933a0abadb0411f62da2021-12-02T16:51:49ZATHB2 is a negative regulator of germination in Arabidopsis thaliana seeds10.1038/s41598-021-88874-52045-2322https://doaj.org/article/82da4b4ef1a24933a0abadb0411f62da2021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-88874-5https://doaj.org/toc/2045-2322Abstract The germination timing of seeds is of the utmost adaptive importance for plant populations. Light is one of the best characterized factors promoting seed germination in several species. The germination is also finely regulated by changes in hormones levels, mainly those of gibberellin (GA) and abscisic acid (ABA). Here, we performed physiological, pharmacological, and molecular analyses to uncover the role of ATHB2, an HD-ZIP II transcription factor, in germination of Arabidopsis seeds. Our study demonstrated that ATHB2 is a negative regulator and sustains the expression of transcription factors to block germination promoted by light. Besides, we found that ATHB2 increases ABA sensitivity. Moreover, ABA and auxin content in athb2-2 mutant is higher than wild-type in dry seeds, but the differences disappeared during the imbibition in darkness and the first hours of exposition to light, respectively. Some ABA and light transcription factors are up-regulated by ATHB2, such as ABI5, ABI3, XERICO, SOMNUS and PIL5/PIF1. In opposition, PIN7, an auxin transport, is down-regulated. The role of ATHB2 as a repressor of germination induced by light affecting the gemination timing, could have differential effects on the establishment of seedlings altering the competitiveness between crops and weeds in the field.Tognacca Rocío SoledadCarabelli MonicaMorelli GiorgioRuberti IdaBotto Javier FranciscoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tognacca Rocío Soledad Carabelli Monica Morelli Giorgio Ruberti Ida Botto Javier Francisco ATHB2 is a negative regulator of germination in Arabidopsis thaliana seeds
description	Abstract The germination timing of seeds is of the utmost adaptive importance for plant populations. Light is one of the best characterized factors promoting seed germination in several species. The germination is also finely regulated by changes in hormones levels, mainly those of gibberellin (GA) and abscisic acid (ABA). Here, we performed physiological, pharmacological, and molecular analyses to uncover the role of ATHB2, an HD-ZIP II transcription factor, in germination of Arabidopsis seeds. Our study demonstrated that ATHB2 is a negative regulator and sustains the expression of transcription factors to block germination promoted by light. Besides, we found that ATHB2 increases ABA sensitivity. Moreover, ABA and auxin content in athb2-2 mutant is higher than wild-type in dry seeds, but the differences disappeared during the imbibition in darkness and the first hours of exposition to light, respectively. Some ABA and light transcription factors are up-regulated by ATHB2, such as ABI5, ABI3, XERICO, SOMNUS and PIL5/PIF1. In opposition, PIN7, an auxin transport, is down-regulated. The role of ATHB2 as a repressor of germination induced by light affecting the gemination timing, could have differential effects on the establishment of seedlings altering the competitiveness between crops and weeds in the field.
format	article
author	Tognacca Rocío Soledad Carabelli Monica Morelli Giorgio Ruberti Ida Botto Javier Francisco
author_facet	Tognacca Rocío Soledad Carabelli Monica Morelli Giorgio Ruberti Ida Botto Javier Francisco
author_sort	Tognacca Rocío Soledad
title	ATHB2 is a negative regulator of germination in Arabidopsis thaliana seeds
title_short	ATHB2 is a negative regulator of germination in Arabidopsis thaliana seeds
title_full	ATHB2 is a negative regulator of germination in Arabidopsis thaliana seeds
title_fullStr	ATHB2 is a negative regulator of germination in Arabidopsis thaliana seeds
title_full_unstemmed	ATHB2 is a negative regulator of germination in Arabidopsis thaliana seeds
title_sort	athb2 is a negative regulator of germination in arabidopsis thaliana seeds
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/82da4b4ef1a24933a0abadb0411f62da
work_keys_str_mv	AT tognaccarociosoledad athb2isanegativeregulatorofgerminationinarabidopsisthalianaseeds AT carabellimonica athb2isanegativeregulatorofgerminationinarabidopsisthalianaseeds AT morelligiorgio athb2isanegativeregulatorofgerminationinarabidopsisthalianaseeds AT rubertiida athb2isanegativeregulatorofgerminationinarabidopsisthalianaseeds AT bottojavierfrancisco athb2isanegativeregulatorofgerminationinarabidopsisthalianaseeds
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ATHB2 is a negative regulator of germination in Arabidopsis thaliana seeds

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