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Overexpression of PtrMYB121 Positively Regulates the Formation of Secondary Cell Wall in Arabidopsis thaliana.

Identifieur interne : 000239 ( Main/Exploration ); précédent : 000238; suivant : 000240

Overexpression of PtrMYB121 Positively Regulates the Formation of Secondary Cell Wall in Arabidopsis thaliana.

Auteurs : Ying Liu [République populaire de Chine] ; Jiayin Man [République populaire de Chine] ; Yinghao Wang [République populaire de Chine] ; Chao Yuan [République populaire de Chine] ; Yuyu Shi [République populaire de Chine] ; Bobin Liu [République populaire de Chine] ; Xia Hu [République populaire de Chine] ; Songqing Wu [République populaire de Chine] ; Taoxiang Zhang [République populaire de Chine] ; Chunlan Lian [Japon]

Source :

RBID : pubmed:33086706

Abstract

MYB transcription factors have a wide range of functions in plant growth, hormone signaling, salt, and drought tolerances. In this study, two homologous transcription factors, PtrMYB55 and PtrMYB121, were isolated and their functions were elucidated. Tissue expression analysis revealed that PtrMYB55 and PtrMYB121 had a similar expression pattern, which had the highest expression in stems. Their expression continuously increased with the growth of poplar, and the expression of PtrMYB121 was significantly upregulated in the process. The full length of PtrMYB121 was 1395 bp, and encoded protein contained 464 amino acids including conserved R2 and R3 MYB domains. We overexpressed PtrMYB121 in Arabidopsis thaliana, and the transgenic lines had the wider xylem as compared with wild-type Arabidopsis. The contents of cellulose and lignin were obviously higher than those in wild-type materials, but there was no significant change in hemicellulose. Quantitative real-time PCR demonstrated that the key enzyme genes regulating the synthesis of lignin and cellulose were significantly upregulated in the transgenic lines. Furthermore, the effector-reporter experiment confirmed that PtrMYB121 bound directly to the promoters of genes relating to the synthesis of lignin and cellulose. These results suggest that PtrMYB121 may positively regulate the formation of secondary cell wall by promoting the synthesis of lignin and cellulose.

DOI: 10.3390/ijms21207734
PubMed: 33086706
PubMed Central: PMC7589094


Affiliations:


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Le document en format XML

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<div type="abstract" xml:lang="en">MYB transcription factors have a wide range of functions in plant growth, hormone signaling, salt, and drought tolerances. In this study, two homologous transcription factors,
<i>PtrMYB55</i>
and
<i>PtrMYB121,</i>
were isolated and their functions were elucidated. Tissue expression analysis revealed that
<i>PtrMYB55</i>
and
<i>PtrMYB121</i>
had a similar expression pattern, which had the highest expression in stems. Their expression continuously increased with the growth of poplar, and the expression of
<i>PtrMYB121</i>
was significantly upregulated in the process. The full length of
<i>PtrMYB121</i>
was 1395 bp, and encoded protein contained 464 amino acids including conserved R2 and R3 MYB domains. We overexpressed
<i>PtrMYB121</i>
in
<i>Arabidopsis thaliana</i>
, and the transgenic lines had the wider xylem as compared with wild-type Arabidopsis. The contents of cellulose and lignin were obviously higher than those in wild-type materials, but there was no significant change in hemicellulose. Quantitative real-time PCR demonstrated that the key enzyme genes regulating the synthesis of lignin and cellulose were significantly upregulated in the transgenic lines. Furthermore, the effector-reporter experiment confirmed that
<i>PtrMYB121</i>
bound directly to the promoters of genes relating to the synthesis of lignin and cellulose. These results suggest that
<i>PtrMYB121</i>
may positively regulate the formation of secondary cell wall by promoting the synthesis of lignin and cellulose.</div>
</front>
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<AbstractText>MYB transcription factors have a wide range of functions in plant growth, hormone signaling, salt, and drought tolerances. In this study, two homologous transcription factors,
<i>PtrMYB55</i>
and
<i>PtrMYB121,</i>
were isolated and their functions were elucidated. Tissue expression analysis revealed that
<i>PtrMYB55</i>
and
<i>PtrMYB121</i>
had a similar expression pattern, which had the highest expression in stems. Their expression continuously increased with the growth of poplar, and the expression of
<i>PtrMYB121</i>
was significantly upregulated in the process. The full length of
<i>PtrMYB121</i>
was 1395 bp, and encoded protein contained 464 amino acids including conserved R2 and R3 MYB domains. We overexpressed
<i>PtrMYB121</i>
in
<i>Arabidopsis thaliana</i>
, and the transgenic lines had the wider xylem as compared with wild-type Arabidopsis. The contents of cellulose and lignin were obviously higher than those in wild-type materials, but there was no significant change in hemicellulose. Quantitative real-time PCR demonstrated that the key enzyme genes regulating the synthesis of lignin and cellulose were significantly upregulated in the transgenic lines. Furthermore, the effector-reporter experiment confirmed that
<i>PtrMYB121</i>
bound directly to the promoters of genes relating to the synthesis of lignin and cellulose. These results suggest that
<i>PtrMYB121</i>
may positively regulate the formation of secondary cell wall by promoting the synthesis of lignin and cellulose.</AbstractText>
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