Overexpression of AtDREB1A causes a severe dwarf phenotype by decreasing endogenous gibberellin levels in soybean [Glycine max (L.) Merr]

Gibberellic acids (GAs) are plant hormones that play fundamental roles in plant growth and developmental processes. Previous studies have demonstrated that three key enzymes of GA20ox, GA3ox, and GA2ox are involved in GA biosynthesis. In this study, the Arabidopsis DREB1A gene driven by the CaMV 35S...

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Veröffentlicht in:PloS one 2012-09, Vol.7 (9), p.e45568-e45568
Hauptverfasser: Suo, Haicui, Ma, Qibin, Ye, Kaixin, Yang, Cunyi, Tang, Yujuan, Hao, Juan, Zhang, Zhanyuan J, Chen, Mingluan, Feng, Yuqi, Nian, Hai
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container_title PloS one
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creator Suo, Haicui
Ma, Qibin
Ye, Kaixin
Yang, Cunyi
Tang, Yujuan
Hao, Juan
Zhang, Zhanyuan J
Chen, Mingluan
Feng, Yuqi
Nian, Hai
description Gibberellic acids (GAs) are plant hormones that play fundamental roles in plant growth and developmental processes. Previous studies have demonstrated that three key enzymes of GA20ox, GA3ox, and GA2ox are involved in GA biosynthesis. In this study, the Arabidopsis DREB1A gene driven by the CaMV 35S promoter was introduced into soybean plants by Agrobacterium- mediated transformation. The results showed that the transgenic soybean plants exhibited a typical phenotype of GA-deficient mutants, such as severe dwarfism, small and dark-green leaves, and late flowering compared to those of the non-transgenic plants. The dwarfism phenotype was rescued by the application of exogenous GA(3) once a week for three weeks with the concentrations of 144 µM or three times in one week with the concentrations of 60 µM. Quantitative RT-PCR analysis revealed that the transcription levels of the GA synthase genes were higher in the transgenic soybean plants than those in controls, whereas GA-deactivated genes except GmGA2ox4 showed lower levels of expression. The transcript level of GmGA2ox4 encoding the only deactivation enzyme using C(20)-GAs as the substrates in soybean was dramatically enhanced in transgenic plants compared to that of wide type. Furthermore, the contents of endogenous bioactive GAs were significantly decreased in transgenic plants than those of wide type. The results suggested that AtDREB1A could cause dwarfism mediated by GA biosynthesis pathway in soybean.
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Merr]</atitle><jtitle>PloS one</jtitle><addtitle>PLoS One</addtitle><date>2012-09-18</date><risdate>2012</risdate><volume>7</volume><issue>9</issue><spage>e45568</spage><epage>e45568</epage><pages>e45568-e45568</pages><issn>1932-6203</issn><eissn>1932-6203</eissn><abstract>Gibberellic acids (GAs) are plant hormones that play fundamental roles in plant growth and developmental processes. Previous studies have demonstrated that three key enzymes of GA20ox, GA3ox, and GA2ox are involved in GA biosynthesis. In this study, the Arabidopsis DREB1A gene driven by the CaMV 35S promoter was introduced into soybean plants by Agrobacterium- mediated transformation. The results showed that the transgenic soybean plants exhibited a typical phenotype of GA-deficient mutants, such as severe dwarfism, small and dark-green leaves, and late flowering compared to those of the non-transgenic plants. The dwarfism phenotype was rescued by the application of exogenous GA(3) once a week for three weeks with the concentrations of 144 µM or three times in one week with the concentrations of 60 µM. Quantitative RT-PCR analysis revealed that the transcription levels of the GA synthase genes were higher in the transgenic soybean plants than those in controls, whereas GA-deactivated genes except GmGA2ox4 showed lower levels of expression. The transcript level of GmGA2ox4 encoding the only deactivation enzyme using C(20)-GAs as the substrates in soybean was dramatically enhanced in transgenic plants compared to that of wide type. Furthermore, the contents of endogenous bioactive GAs were significantly decreased in transgenic plants than those of wide type. The results suggested that AtDREB1A could cause dwarfism mediated by GA biosynthesis pathway in soybean.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>23029105</pmid><doi>10.1371/journal.pone.0045568</doi><oa>free_for_read</oa></addata></record>
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subjects Agriculture
Analysis
Arabidopsis
Arabidopsis Proteins - genetics
Arabidopsis thaliana
Biology
Biosynthesis
Cloning
Deactivation
Deficient mutant
Dwarfism
Dwarfism - genetics
Flowering
Gene Expression
Genes
Genetic aspects
Genetic transformation
Gibberellins - metabolism
Gibberellins - pharmacology
Glycine max
Glycine max - anatomy & histology
Glycine max - drug effects
Glycine max - genetics
Glycine max - metabolism
Hormones
Laboratories
Leaves
Mutants
Oryza
Phenotype
Physiological aspects
Plant growth
Plant hormones
Plant Leaves - anatomy & histology
Plant Leaves - drug effects
Plants (botany)
Plants, Genetically Modified
Polymerase chain reaction
Proteins
Salinity
Seeds - anatomy & histology
Seeds - drug effects
Soybeans
Substrates
Tobacco
Transcription
Transcription factors
Transcription Factors - genetics
Transformation
Transgenic plants
title Overexpression of AtDREB1A causes a severe dwarf phenotype by decreasing endogenous gibberellin levels in soybean [Glycine max (L.) Merr]
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