Overexpression of a predominantly root-expressed NAC transcription factor in wheat roots enhances root length, biomass and drought tolerance

Key message TaRNAC1 is a constitutively and predominantly root-expressed NAC transcription factor. TaRNAC1 overexpression in wheat roots confers increased root length, biomass and drought tolerance and improved grain yield under water limitation. A large and deep root system is an important trait fo...

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Veröffentlicht in:Plant cell reports 2018-02, Vol.37 (2), p.225-237
Hauptverfasser: Chen, Dandan, Chai, Shoucheng, McIntyre, C. Lynne, Xue, Gang-Ping
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Chai, Shoucheng
McIntyre, C. Lynne
Xue, Gang-Ping
description Key message TaRNAC1 is a constitutively and predominantly root-expressed NAC transcription factor. TaRNAC1 overexpression in wheat roots confers increased root length, biomass and drought tolerance and improved grain yield under water limitation. A large and deep root system is an important trait for yield sustainability of dryland cereal crops in drought-prone environments. This study investigated the role of a predominantly root-expressed NAC transcription factor from wheat ( TaRNAC1 ) in the root growth. Expression analysis showed that TaRNAC1 was a constitutively expressed gene with high level expression in the roots and was not drought-upregulated. Overexpression of TaRNAC1 in wheat using a predominantly root-expressed promoter resulted in increased root length and biomass observed at the early growth stage and a marked increase in the maturity root biomass with dry root weight of > 70% higher than that of the wild type plants. Analysis of some root growth-related genes revealed that the expression level of GA3-ox2 , which encodes GIBBERELLIN 3-OXIDASE catalysing the conversion of inactive gibberellin (GA) to active GA, was elevated in the roots of transgenic wheat. TaRNAC1 overexpressing transgenic wheat showed more dehydration tolerance under polyethylene glycol (PEG) treatment and produced more aboveground biomass and grain under water-limited conditions than the wild type plants. These data suggest that TaRNAC1 may play a role in root growth and be used as a molecular tool for potential enlargement of root system in wheat.
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Overexpression of TaRNAC1 in wheat using a predominantly root-expressed promoter resulted in increased root length and biomass observed at the early growth stage and a marked increase in the maturity root biomass with dry root weight of &gt; 70% higher than that of the wild type plants. Analysis of some root growth-related genes revealed that the expression level of GA3-ox2 , which encodes GIBBERELLIN 3-OXIDASE catalysing the conversion of inactive gibberellin (GA) to active GA, was elevated in the roots of transgenic wheat. TaRNAC1 overexpressing transgenic wheat showed more dehydration tolerance under polyethylene glycol (PEG) treatment and produced more aboveground biomass and grain under water-limited conditions than the wild type plants. 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Lynne</creatorcontrib><creatorcontrib>Xue, Gang-Ping</creatorcontrib><title>Overexpression of a predominantly root-expressed NAC transcription factor in wheat roots enhances root length, biomass and drought tolerance</title><title>Plant cell reports</title><addtitle>Plant Cell Rep</addtitle><addtitle>Plant Cell Rep</addtitle><description>Key message TaRNAC1 is a constitutively and predominantly root-expressed NAC transcription factor. TaRNAC1 overexpression in wheat roots confers increased root length, biomass and drought tolerance and improved grain yield under water limitation. A large and deep root system is an important trait for yield sustainability of dryland cereal crops in drought-prone environments. This study investigated the role of a predominantly root-expressed NAC transcription factor from wheat ( TaRNAC1 ) in the root growth. Expression analysis showed that TaRNAC1 was a constitutively expressed gene with high level expression in the roots and was not drought-upregulated. Overexpression of TaRNAC1 in wheat using a predominantly root-expressed promoter resulted in increased root length and biomass observed at the early growth stage and a marked increase in the maturity root biomass with dry root weight of &gt; 70% higher than that of the wild type plants. Analysis of some root growth-related genes revealed that the expression level of GA3-ox2 , which encodes GIBBERELLIN 3-OXIDASE catalysing the conversion of inactive gibberellin (GA) to active GA, was elevated in the roots of transgenic wheat. TaRNAC1 overexpressing transgenic wheat showed more dehydration tolerance under polyethylene glycol (PEG) treatment and produced more aboveground biomass and grain under water-limited conditions than the wild type plants. 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Lynne</au><au>Xue, Gang-Ping</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Overexpression of a predominantly root-expressed NAC transcription factor in wheat roots enhances root length, biomass and drought tolerance</atitle><jtitle>Plant cell reports</jtitle><stitle>Plant Cell Rep</stitle><addtitle>Plant Cell Rep</addtitle><date>2018-02-01</date><risdate>2018</risdate><volume>37</volume><issue>2</issue><spage>225</spage><epage>237</epage><pages>225-237</pages><issn>0721-7714</issn><eissn>1432-203X</eissn><abstract>Key message TaRNAC1 is a constitutively and predominantly root-expressed NAC transcription factor. TaRNAC1 overexpression in wheat roots confers increased root length, biomass and drought tolerance and improved grain yield under water limitation. A large and deep root system is an important trait for yield sustainability of dryland cereal crops in drought-prone environments. This study investigated the role of a predominantly root-expressed NAC transcription factor from wheat ( TaRNAC1 ) in the root growth. Expression analysis showed that TaRNAC1 was a constitutively expressed gene with high level expression in the roots and was not drought-upregulated. Overexpression of TaRNAC1 in wheat using a predominantly root-expressed promoter resulted in increased root length and biomass observed at the early growth stage and a marked increase in the maturity root biomass with dry root weight of &gt; 70% higher than that of the wild type plants. Analysis of some root growth-related genes revealed that the expression level of GA3-ox2 , which encodes GIBBERELLIN 3-OXIDASE catalysing the conversion of inactive gibberellin (GA) to active GA, was elevated in the roots of transgenic wheat. TaRNAC1 overexpressing transgenic wheat showed more dehydration tolerance under polyethylene glycol (PEG) treatment and produced more aboveground biomass and grain under water-limited conditions than the wild type plants. These data suggest that TaRNAC1 may play a role in root growth and be used as a molecular tool for potential enlargement of root system in wheat.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><pmid>29079898</pmid><doi>10.1007/s00299-017-2224-y</doi><tpages>13</tpages></addata></record>
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subjects Adaptation, Physiological - genetics
Arid zones
Biomass
Biomedical and Life Sciences
Biotechnology
Cell Biology
Cereal crops
Crop yield
Dehydration
Drought
Drought resistance
Droughts
Enlargement
Gene expression
Gene Expression Regulation, Developmental
Gene Expression Regulation, Plant
Gibberellins - metabolism
Grain
Growth stage
Life Sciences
Mixed Function Oxygenases - genetics
Mixed Function Oxygenases - metabolism
Original Article
Plant Biochemistry
Plant growth
Plant Proteins - genetics
Plant Proteins - metabolism
Plant Roots - genetics
Plant Roots - growth & development
Plant Roots - metabolism
Plant Sciences
Plants (botany)
Plants, Genetically Modified
Polyethylene glycol
Roots
Transcription factors
Transcription Factors - genetics
Transcription Factors - metabolism
Triticum - genetics
Triticum - growth & development
Triticum - metabolism
Wheat
title Overexpression of a predominantly root-expressed NAC transcription factor in wheat roots enhances root length, biomass and drought tolerance
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