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Chloroplast (Cp) Transcriptome of P. davidiana Dode×P. bolleana Lauch provides insight into the Cp drought response and Populus Cp phylogeny.

Identifieur interne : 000515 ( Main/Exploration ); précédent : 000514; suivant : 000516

Chloroplast (Cp) Transcriptome of P. davidiana Dode×P. bolleana Lauch provides insight into the Cp drought response and Populus Cp phylogeny.

Auteurs : Xin Zhang [République populaire de Chine] ; Chenrui Gu [République populaire de Chine] ; Tianxu Zhang [République populaire de Chine] ; Botong Tong [République populaire de Chine] ; Heng Zhang [République populaire de Chine] ; Yueliang Wu [République populaire de Chine] ; Chuanping Yang [République populaire de Chine]

Source :

RBID : pubmed:32375634

Descripteurs français

English descriptors

Abstract

BACKGROUND

Raw second-generation (2G) lignocellulosic biomass materials have the potential for development into a sustainable and renewable source of energy. Poplar is regarded as a promising 2G material (P. davidiana Dode×P. bolleana Lauch, P. bolleana, P. davidiana, P. euphratica, et al). However, their large-scale commercialization still faces many obstacles. For example, drought prevents sufficient irrigation or rainfall, which can reduce soil moisture and eventually destroy the chloroplast, the plant photosynthetic organelle. Heterosis is widely used in the production of drought-tolerant materials, such as the superior clone "Shanxinyang" selected from the offspring of Populus davidiana Dode×Populus bolleana Lauch. Because it produces good wood and is easily genetically transformed, "Shanxinyang" has become a promising material for use in tree genetics. It is also one of the most abundant biofuel plants in northern China. Understanding the genetic features of chloroplasts, the cp transcriptome and physiology is crucial to elucidating the chloroplast drought-response model.

RESULTS

In this study, the whole genome of "Shanxinyang" was sequenced. The chloroplast genome was assembled, and chloroplast structure was analysed and compared with that of other popular plants. Chloroplast transcriptome analysis was performed under drought conditions. The total length of the "Shanxinyang" chloroplast genome was 156,190 bp, the GC content was 36.75%, and the genome was composed of four typical areas (LSC, IRa, IRb, and SSC). A total of 114 simple repeats were detected in the chloroplast genome of "Shanxinyang". In cp transcriptome analysis, we found 161 up-regulated and 157 down-regulated genes under drought, and 9 cpDEGs was randomly selected to conduct reverse transcription (RT)-qPCR., in which the Log2 (fold change) was significantly consistent with the qPCR results. The analysis of chloroplast transcription under drought provided clues for understanding chloroplast function under drought. The phylogenetic position of "Shanxinyang" within Populus was analysed by using the chloroplast genome sequences of 23 Populus plants, showing that "Shanxinyang" belongs to Sect. Populus and is sister to Populus davidiana. Further, mVISTA analysis showed that the variation in non-coding (regulatory) regions was greater than that in coding regions, which suggests that further attention should be paid to the chloroplast in order to obtain new evolutionary or functional insights related to aspects of plant biology.

CONCLUSIONS

Our findings indicate that complex prokaryotic genome regulation occurs when processing transcripts under drought stress. The results not only offer clues for understanding the chloroplast genome and transcription features in woody plants but also serve as a basis for future molecular studies on poplar species.


DOI: 10.1186/s12862-020-01622-7
PubMed: 32375634
PubMed Central: PMC7201580


Affiliations:


Links toward previous steps (curation, corpus...)


Le document en format XML

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<term>Base Composition (genetics)</term>
<term>Base Sequence (MeSH)</term>
<term>Chloroplasts (genetics)</term>
<term>Droughts (MeSH)</term>
<term>Exons (genetics)</term>
<term>Gene Expression Regulation, Plant (MeSH)</term>
<term>Genome, Chloroplast (MeSH)</term>
<term>Introns (genetics)</term>
<term>Inverted Repeat Sequences (genetics)</term>
<term>Molecular Sequence Annotation (MeSH)</term>
<term>Phylogeny (MeSH)</term>
<term>Populus (classification)</term>
<term>Populus (genetics)</term>
<term>Transcriptome (genetics)</term>
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<term>Annotation de séquence moléculaire (MeSH)</term>
<term>Chloroplastes (génétique)</term>
<term>Composition en bases nucléiques (génétique)</term>
<term>Exons (génétique)</term>
<term>Génome de chloroplaste (MeSH)</term>
<term>Introns (génétique)</term>
<term>Phylogenèse (MeSH)</term>
<term>Populus (classification)</term>
<term>Populus (génétique)</term>
<term>Régulation de l'expression des gènes végétaux (MeSH)</term>
<term>Sécheresses (MeSH)</term>
<term>Séquence nucléotidique (MeSH)</term>
<term>Séquences répétées inversées (génétique)</term>
<term>Transcriptome (génétique)</term>
</keywords>
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<term>Populus</term>
</keywords>
<keywords scheme="MESH" qualifier="genetics" xml:lang="en">
<term>Base Composition</term>
<term>Chloroplasts</term>
<term>Exons</term>
<term>Introns</term>
<term>Inverted Repeat Sequences</term>
<term>Populus</term>
<term>Transcriptome</term>
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<term>Chloroplastes</term>
<term>Composition en bases nucléiques</term>
<term>Exons</term>
<term>Introns</term>
<term>Populus</term>
<term>Séquences répétées inversées</term>
<term>Transcriptome</term>
</keywords>
<keywords scheme="MESH" xml:lang="en">
<term>Base Sequence</term>
<term>Droughts</term>
<term>Gene Expression Regulation, Plant</term>
<term>Genome, Chloroplast</term>
<term>Molecular Sequence Annotation</term>
<term>Phylogeny</term>
</keywords>
<keywords scheme="MESH" qualifier="classification" xml:lang="fr">
<term>Annotation de séquence moléculaire</term>
<term>Génome de chloroplaste</term>
<term>Phylogenèse</term>
<term>Populus</term>
<term>Régulation de l'expression des gènes végétaux</term>
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<div type="abstract" xml:lang="en">
<p>
<b>BACKGROUND</b>
</p>
<p>Raw second-generation (2G) lignocellulosic biomass materials have the potential for development into a sustainable and renewable source of energy. Poplar is regarded as a promising 2G material (P. davidiana Dode×P. bolleana Lauch, P. bolleana, P. davidiana, P. euphratica, et al). However, their large-scale commercialization still faces many obstacles. For example, drought prevents sufficient irrigation or rainfall, which can reduce soil moisture and eventually destroy the chloroplast, the plant photosynthetic organelle. Heterosis is widely used in the production of drought-tolerant materials, such as the superior clone "Shanxinyang" selected from the offspring of Populus davidiana Dode×Populus bolleana Lauch. Because it produces good wood and is easily genetically transformed, "Shanxinyang" has become a promising material for use in tree genetics. It is also one of the most abundant biofuel plants in northern China. Understanding the genetic features of chloroplasts, the cp transcriptome and physiology is crucial to elucidating the chloroplast drought-response model.</p>
</div>
<div type="abstract" xml:lang="en">
<p>
<b>RESULTS</b>
</p>
<p>In this study, the whole genome of "Shanxinyang" was sequenced. The chloroplast genome was assembled, and chloroplast structure was analysed and compared with that of other popular plants. Chloroplast transcriptome analysis was performed under drought conditions. The total length of the "Shanxinyang" chloroplast genome was 156,190 bp, the GC content was 36.75%, and the genome was composed of four typical areas (LSC, IRa, IRb, and SSC). A total of 114 simple repeats were detected in the chloroplast genome of "Shanxinyang". In cp transcriptome analysis, we found 161 up-regulated and 157 down-regulated genes under drought, and 9 cpDEGs was randomly selected to conduct reverse transcription (RT)-qPCR., in which the Log2 (fold change) was significantly consistent with the qPCR results. The analysis of chloroplast transcription under drought provided clues for understanding chloroplast function under drought. The phylogenetic position of "Shanxinyang" within Populus was analysed by using the chloroplast genome sequences of 23 Populus plants, showing that "Shanxinyang" belongs to Sect. Populus and is sister to Populus davidiana. Further, mVISTA analysis showed that the variation in non-coding (regulatory) regions was greater than that in coding regions, which suggests that further attention should be paid to the chloroplast in order to obtain new evolutionary or functional insights related to aspects of plant biology.</p>
</div>
<div type="abstract" xml:lang="en">
<p>
<b>CONCLUSIONS</b>
</p>
<p>Our findings indicate that complex prokaryotic genome regulation occurs when processing transcripts under drought stress. The results not only offer clues for understanding the chloroplast genome and transcription features in woody plants but also serve as a basis for future molecular studies on poplar species.</p>
</div>
</front>
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<Abstract>
<AbstractText Label="BACKGROUND">Raw second-generation (2G) lignocellulosic biomass materials have the potential for development into a sustainable and renewable source of energy. Poplar is regarded as a promising 2G material (P. davidiana Dode×P. bolleana Lauch, P. bolleana, P. davidiana, P. euphratica, et al). However, their large-scale commercialization still faces many obstacles. For example, drought prevents sufficient irrigation or rainfall, which can reduce soil moisture and eventually destroy the chloroplast, the plant photosynthetic organelle. Heterosis is widely used in the production of drought-tolerant materials, such as the superior clone "Shanxinyang" selected from the offspring of Populus davidiana Dode×Populus bolleana Lauch. Because it produces good wood and is easily genetically transformed, "Shanxinyang" has become a promising material for use in tree genetics. It is also one of the most abundant biofuel plants in northern China. Understanding the genetic features of chloroplasts, the cp transcriptome and physiology is crucial to elucidating the chloroplast drought-response model.</AbstractText>
<AbstractText Label="RESULTS">In this study, the whole genome of "Shanxinyang" was sequenced. The chloroplast genome was assembled, and chloroplast structure was analysed and compared with that of other popular plants. Chloroplast transcriptome analysis was performed under drought conditions. The total length of the "Shanxinyang" chloroplast genome was 156,190 bp, the GC content was 36.75%, and the genome was composed of four typical areas (LSC, IRa, IRb, and SSC). A total of 114 simple repeats were detected in the chloroplast genome of "Shanxinyang". In cp transcriptome analysis, we found 161 up-regulated and 157 down-regulated genes under drought, and 9 cpDEGs was randomly selected to conduct reverse transcription (RT)-qPCR., in which the Log2 (fold change) was significantly consistent with the qPCR results. The analysis of chloroplast transcription under drought provided clues for understanding chloroplast function under drought. The phylogenetic position of "Shanxinyang" within Populus was analysed by using the chloroplast genome sequences of 23 Populus plants, showing that "Shanxinyang" belongs to Sect. Populus and is sister to Populus davidiana. Further, mVISTA analysis showed that the variation in non-coding (regulatory) regions was greater than that in coding regions, which suggests that further attention should be paid to the chloroplast in order to obtain new evolutionary or functional insights related to aspects of plant biology.</AbstractText>
<AbstractText Label="CONCLUSIONS">Our findings indicate that complex prokaryotic genome regulation occurs when processing transcripts under drought stress. The results not only offer clues for understanding the chloroplast genome and transcription features in woody plants but also serve as a basis for future molecular studies on poplar species.</AbstractText>
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<Affiliation>State Key Laboratory of Tree Genetics and Breeding, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, China.</Affiliation>
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<Affiliation>School of Forestry, Shenyang Agricultural University, 120 Dongling Road, Shenyang, 10866, China.</Affiliation>
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</Grant>
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