Document Detail

MAP65-1 and MAP65-2 promote cell proliferation and axial growth in Arabidopsis roots.
MedLine Citation:
PMID:  22443289     Owner:  NLM     Status:  Publisher    
We investigated the role of the Arabidopsis Microtubule Associated Proteins 65-1 and 65-2 (MAP65-1 and MAP65-2) in the control of axial root growth. Transgenic plants expressing fluorescent fusion proteins from native promoters indicated exactly overlapping accumulation of MAP65-1 and MAP65-2 in the root tip and elongation zone. Nearly identical protein accumulation patterns were observed when MAP65-1 and MAP65-2 were expressed behind a constitutive CaMV 35S promoter, suggesting a level of post-transcriptional control that restricts these proteins to rapidly growing portions of the root. Co-expression of MAP65-1 and MAP65-2 fusion proteins showed precise co-localization to interphase and cytokinetic microtubule arrays. In interphase root tip cells, the fluorescent protein fusions labeled microtubules that were organized into a variety of different array patterns. In the rapidly growing cells of the root elongation zone, we found MAP65-1 and MAP65-2 co-localized exclusively to the lateral faces of cells that were axially extending. Genetic analysis showed that MAP65-1 and MAP65-2 are coordinately required for proper root elongation. Double map65-1-1/map65-2-2 mutant roots from dark-grown plants contained 50% fewer cells per file than wild type roots, but we found no evidence that cytokinesis was disrupted. We additionally discovered that cell length was significantly shorter in the mature regions of the root beyond the zone where MAP65-1 and MAP65-2 accumulated. Our data indicate that MAP65-1 and MAP65-2 play a critical role in root growth by promoting cell proliferation and axial extension. © 2012 The Authors. The Plant Journal © 2012 Blackwell Publishing Ltd.
Jessica R Lucas; Sidney L Shaw
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-3-24
Journal Detail:
Title:  The Plant journal : for cell and molecular biology     Volume:  -     ISSN:  1365-313X     ISO Abbreviation:  -     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-3-26     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9207397     Medline TA:  Plant J     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012 The Authors. The Plant Journal © 2012 Blackwell Publishing Ltd.
Department of Biology, Indiana University, Bloomington, IN 47405.
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