PoplarV1, Main, Exploration, bibRecord, 000132

Seasonal nitrogen remobilization and the role of auxin transport in poplar trees.

Identifieur interne : 000132 ( Main/Exploration ); précédent : 000131; suivant : 000133

Seasonal nitrogen remobilization and the role of auxin transport in poplar trees.

Auteurs : Gen Li [États-Unis] ; Rongshoung Lin [États-Unis] ; Chioma Egekwu [États-Unis] ; Joshua Blakeslee [États-Unis] ; Jinshan Lin [États-Unis] ; Emily Pettengill [États-Unis] ; Angus S. Murphy [États-Unis] ; Wendy A. Peer [États-Unis] ; Nazrul Islam [États-Unis] ; Benjamin A. Babst [États-Unis] ; Fei Gao [États-Unis] ; Sergey Komarov [États-Unis] ; Yuan-Chuan Tai [États-Unis] ; Gary D. Coleman [États-Unis]

Source :

Journal of experimental botany [ 1460-2431 ] ; 2020.

RBID : pubmed:32161967

Abstract

Seasonal nitrogen (N) cycling in Populus, involves bark storage proteins (BSPs) that accumulate in bark phloem parenchyma in the autumn and decline when shoot growth resumes in the spring. Little is known about the contribution of BSPs to growth or the signals regulating N remobilization from BSPs. Knockdown of BSP accumulation via RNAi and N sink manipulations were used to understand how BSP storage influences shoot growth. Reduced accumulation of BSPs delayed bud break and reduced shoot growth following dormancy. Further, 13N tracer studies also showed that BSP accumulation is an important factor in N partitioning from senescing leaves to bark. Thus, BSP accumulation has a role in N remobilization during N partitioning both from senescing leaves to bark and from bark to expanding shoots once growth commences following dormancy. The bark transcriptome during BSP catabolism and N remobilization was enriched in genes associated with auxin transport and signaling, and manipulation of the source of auxin or auxin transport revealed a role for auxin in regulating BSP catabolism and N remobilization. Therefore, N remobilization appears to be regulated by auxin produced in expanding buds and shoots that is transported to bark where it regulates protease gene expression and BSP catabolism.

DOI: 10.1093/jxb/eraa130
PubMed: 32161967
PubMed Central: PMC7382381

Affiliations:

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<author><name sortKey="Islam, Nazrul" sort="Islam, Nazrul" uniqKey="Islam N" first="Nazrul" last="Islam">Nazrul Islam</name>
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<front><div type="abstract" xml:lang="en">Seasonal nitrogen (N) cycling in Populus, involves bark storage proteins (BSPs) that accumulate in bark phloem parenchyma in the autumn and decline when shoot growth resumes in the spring. Little is known about the contribution of BSPs to growth or the signals regulating N remobilization from BSPs. Knockdown of BSP accumulation via RNAi and N sink manipulations were used to understand how BSP storage influences shoot growth. Reduced accumulation of BSPs delayed bud break and reduced shoot growth following dormancy. Further, 13N tracer studies also showed that BSP accumulation is an important factor in N partitioning from senescing leaves to bark. Thus, BSP accumulation has a role in N remobilization during N partitioning both from senescing leaves to bark and from bark to expanding shoots once growth commences following dormancy. The bark transcriptome during BSP catabolism and N remobilization was enriched in genes associated with auxin transport and signaling, and manipulation of the source of auxin or auxin transport revealed a role for auxin in regulating BSP catabolism and N remobilization. Therefore, N remobilization appears to be regulated by auxin produced in expanding buds and shoots that is transported to bark where it regulates protease gene expression and BSP catabolism.</div>
</front>
</TEI>
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<DateRevised><Year>2020</Year>
<Month>07</Month>
<Day>30</Day>
</DateRevised>
<Article PubModel="Print"><Journal><ISSN IssnType="Electronic">1460-2431</ISSN>
<JournalIssue CitedMedium="Internet"><Volume>71</Volume>
<Issue>15</Issue>
<PubDate><Year>2020</Year>
<Month>Jul</Month>
<Day>25</Day>
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<Title>Journal of experimental botany</Title>
<ISOAbbreviation>J Exp Bot</ISOAbbreviation>
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<ArticleTitle>Seasonal nitrogen remobilization and the role of auxin transport in poplar trees.</ArticleTitle>
<Pagination><MedlinePgn>4512-4530</MedlinePgn>
</Pagination>
<ELocationID EIdType="doi" ValidYN="Y">10.1093/jxb/eraa130</ELocationID>
<Abstract><AbstractText>Seasonal nitrogen (N) cycling in Populus, involves bark storage proteins (BSPs) that accumulate in bark phloem parenchyma in the autumn and decline when shoot growth resumes in the spring. Little is known about the contribution of BSPs to growth or the signals regulating N remobilization from BSPs. Knockdown of BSP accumulation via RNAi and N sink manipulations were used to understand how BSP storage influences shoot growth. Reduced accumulation of BSPs delayed bud break and reduced shoot growth following dormancy. Further, 13N tracer studies also showed that BSP accumulation is an important factor in N partitioning from senescing leaves to bark. Thus, BSP accumulation has a role in N remobilization during N partitioning both from senescing leaves to bark and from bark to expanding shoots once growth commences following dormancy. The bark transcriptome during BSP catabolism and N remobilization was enriched in genes associated with auxin transport and signaling, and manipulation of the source of auxin or auxin transport revealed a role for auxin in regulating BSP catabolism and N remobilization. Therefore, N remobilization appears to be regulated by auxin produced in expanding buds and shoots that is transported to bark where it regulates protease gene expression and BSP catabolism.</AbstractText>
<CopyrightInformation>© The Author(s) 2020. Published by Oxford University Press on behalf of the Society for Experimental Biology.</CopyrightInformation>
</Abstract>
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<ForeName>Gen</ForeName>
<Initials>G</Initials>
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</AffiliationInfo>
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Seasonal nitrogen remobilization and the role of auxin transport in poplar trees.

Seasonal nitrogen remobilization and the role of auxin transport in poplar trees.

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