Arbuscular mycorrhizal fungi alter root and foliar responses to fissure-induced root damage stress

Ground subsidence caused by coal mining can produce large amounts of surface ground fissures which may damage the surrounding plant roots. Here, a device was used that simulates root damage and we observed the growth of maize roots in real time, the morphological responses of roots and leaves to fis...

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Autores principales:	Jian Zhang, Yinli Bi, Ziheng Song, Li Xiao, Peter Christie
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Endogenous hormones Fine roots Ground fissures Mycorrhizal bioremediation Root system morphology Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/63812d33969f474db950d56d7e5dd95e
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spelling	oai:doaj.org-article:63812d33969f474db950d56d7e5dd95e2021-12-01T04:53:47ZArbuscular mycorrhizal fungi alter root and foliar responses to fissure-induced root damage stress1470-160X10.1016/j.ecolind.2021.107800https://doaj.org/article/63812d33969f474db950d56d7e5dd95e2021-08-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21004659https://doaj.org/toc/1470-160XGround subsidence caused by coal mining can produce large amounts of surface ground fissures which may damage the surrounding plant roots. Here, a device was used that simulates root damage and we observed the growth of maize roots in real time, the morphological responses of roots and leaves to fissure-induced root damage stress, and the effects of arbuscular mycorrhizal fungi (AMF). Time series of root and leaf growth and hormonal changes in mycorrhizal and control plants with damaged root systems were observed for the first time. Indole-3-acetic acid (IAA) and cytokinin (CTK) levels in roots and leaves decreased significantly one week after ground fissuring. Abscisic acid (ABA) levels increased and the growth of roots and leaves was inhibited. Arbuscular mycorrhizal fungi (AMF) reversed these trends and significantly increased the percentages of root tips and fine roots compared with uninoculated controls. IAA and CTK levels declined significantly in roots and leaves six weeks after ground fissuring but ABA levels remained unchanged. AMF inoculation significantly increased both IAA and CTK levels but decreased ABA levels. The spatial distribution of roots was affected by fissures in addition to the changes in hormones. The negative impacts of ground fissures on maize growth were alleviated by AMF inoculation at harvest with increased shoot and root biomass. The results suggest that the ameliorative effects of AMF on root damage stress may be related to the regulation of hormone levels and an increase in the percentage of fine roots which was conducive to the growth of roots and leaves and increased plant resistance to environmental stress. In addition, analysis of variable distributions shows that the ameliorative effects of AMF were affected by the degree of root damage.Jian ZhangYinli BiZiheng SongLi XiaoPeter ChristieElsevierarticleEndogenous hormonesFine rootsGround fissuresMycorrhizal bioremediationRoot system morphologyEcologyQH540-549.5ENEcological Indicators, Vol 127, Iss , Pp 107800- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Endogenous hormones Fine roots Ground fissures Mycorrhizal bioremediation Root system morphology Ecology QH540-549.5
spellingShingle	Endogenous hormones Fine roots Ground fissures Mycorrhizal bioremediation Root system morphology Ecology QH540-549.5 Jian Zhang Yinli Bi Ziheng Song Li Xiao Peter Christie Arbuscular mycorrhizal fungi alter root and foliar responses to fissure-induced root damage stress
description	Ground subsidence caused by coal mining can produce large amounts of surface ground fissures which may damage the surrounding plant roots. Here, a device was used that simulates root damage and we observed the growth of maize roots in real time, the morphological responses of roots and leaves to fissure-induced root damage stress, and the effects of arbuscular mycorrhizal fungi (AMF). Time series of root and leaf growth and hormonal changes in mycorrhizal and control plants with damaged root systems were observed for the first time. Indole-3-acetic acid (IAA) and cytokinin (CTK) levels in roots and leaves decreased significantly one week after ground fissuring. Abscisic acid (ABA) levels increased and the growth of roots and leaves was inhibited. Arbuscular mycorrhizal fungi (AMF) reversed these trends and significantly increased the percentages of root tips and fine roots compared with uninoculated controls. IAA and CTK levels declined significantly in roots and leaves six weeks after ground fissuring but ABA levels remained unchanged. AMF inoculation significantly increased both IAA and CTK levels but decreased ABA levels. The spatial distribution of roots was affected by fissures in addition to the changes in hormones. The negative impacts of ground fissures on maize growth were alleviated by AMF inoculation at harvest with increased shoot and root biomass. The results suggest that the ameliorative effects of AMF on root damage stress may be related to the regulation of hormone levels and an increase in the percentage of fine roots which was conducive to the growth of roots and leaves and increased plant resistance to environmental stress. In addition, analysis of variable distributions shows that the ameliorative effects of AMF were affected by the degree of root damage.
format	article
author	Jian Zhang Yinli Bi Ziheng Song Li Xiao Peter Christie
author_facet	Jian Zhang Yinli Bi Ziheng Song Li Xiao Peter Christie
author_sort	Jian Zhang
title	Arbuscular mycorrhizal fungi alter root and foliar responses to fissure-induced root damage stress
title_short	Arbuscular mycorrhizal fungi alter root and foliar responses to fissure-induced root damage stress
title_full	Arbuscular mycorrhizal fungi alter root and foliar responses to fissure-induced root damage stress
title_fullStr	Arbuscular mycorrhizal fungi alter root and foliar responses to fissure-induced root damage stress
title_full_unstemmed	Arbuscular mycorrhizal fungi alter root and foliar responses to fissure-induced root damage stress
title_sort	arbuscular mycorrhizal fungi alter root and foliar responses to fissure-induced root damage stress
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/63812d33969f474db950d56d7e5dd95e
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Arbuscular mycorrhizal fungi alter root and foliar responses to fissure-induced root damage stress

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