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Developmental and seasonal expression of PtaHB1, a Populus gene encoding a class III HD-Zip protein, is closely associated with secondary growth and inversely correlated with the level of microRNA (miR166).

Identifieur interne : 003E37 ( Main/Exploration ); précédent : 003E36; suivant : 003E38

Developmental and seasonal expression of PtaHB1, a Populus gene encoding a class III HD-Zip protein, is closely associated with secondary growth and inversely correlated with the level of microRNA (miR166).

Auteurs : Jae-Heung Ko [États-Unis] ; Constantinos Prassinos ; Kyung-Hwan Han

Source :

RBID : pubmed:16411950

Descripteurs français

English descriptors

Abstract

In contrast to our knowledge of the shoot apical meristem, our understanding of cambium meristem differentiation and maintenance is limited. Class III homeodomain leucine-zipper (HD-Zip) proteins have been shown to play a regulatory role in vascular differentiation. The hybrid aspen (Populus tremulaxPopulus alba) class III HD-Zip transcription factor (PtaHB1) and microRNA 166 (Pta-miR166) family were cloned from hybrid aspen using a combination of in silico and polymerase chain reaction methods. Expression analyses of PtaHB1 and Pta-miR166 were performed by Northern blot analysis. The expression of PtaHB1 was closely associated with wood formation and regulated both developmentally and seasonally, with the highest expression during the active growing season. Also, its expression was inversely correlated with the level of Pta-miR166. Pta-miR166-directed cleavage of PtaHB1 in vivo was confirmed using modified 5'-rapid amplification of cDNA ends (RACE). The expression of Pta-miR166 was much higher in the winter than in the growing seasons, suggesting seasonal and developmental regulation of microRNA in this perennial plant species.

DOI: 10.1111/j.1469-8137.2005.01623.x
PubMed: 16411950


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<term>Conserved Sequence (MeSH)</term>
<term>Gene Expression Regulation, Developmental (MeSH)</term>
<term>Gene Expression Regulation, Plant (MeSH)</term>
<term>Homeodomain Proteins (genetics)</term>
<term>Homeodomain Proteins (metabolism)</term>
<term>MicroRNAs (chemistry)</term>
<term>MicroRNAs (genetics)</term>
<term>MicroRNAs (metabolism)</term>
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<term>Phylogeny (MeSH)</term>
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<term>Plant Proteins (metabolism)</term>
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<term>Plant Stems (growth & development)</term>
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<term>Populus (growth & development)</term>
<term>Populus (metabolism)</term>
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<term>Clonage moléculaire (MeSH)</term>
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<term>Populus (croissance et développement)</term>
<term>Populus (génétique)</term>
<term>Populus (métabolisme)</term>
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<term>Similitude structurale de protéines (MeSH)</term>
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<term>Séquence d'acides aminés (MeSH)</term>
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<term>Tiges de plante (croissance et développement)</term>
<term>Tiges de plante (métabolisme)</term>
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<div type="abstract" xml:lang="en">In contrast to our knowledge of the shoot apical meristem, our understanding of cambium meristem differentiation and maintenance is limited. Class III homeodomain leucine-zipper (HD-Zip) proteins have been shown to play a regulatory role in vascular differentiation. The hybrid aspen (Populus tremulaxPopulus alba) class III HD-Zip transcription factor (PtaHB1) and microRNA 166 (Pta-miR166) family were cloned from hybrid aspen using a combination of in silico and polymerase chain reaction methods. Expression analyses of PtaHB1 and Pta-miR166 were performed by Northern blot analysis. The expression of PtaHB1 was closely associated with wood formation and regulated both developmentally and seasonally, with the highest expression during the active growing season. Also, its expression was inversely correlated with the level of Pta-miR166. Pta-miR166-directed cleavage of PtaHB1 in vivo was confirmed using modified 5'-rapid amplification of cDNA ends (RACE). The expression of Pta-miR166 was much higher in the winter than in the growing seasons, suggesting seasonal and developmental regulation of microRNA in this perennial plant species.</div>
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