Transcriptional programming during cell wall maturation in the expanding Arabidopsis stem

BMC Plant Biology

Research Article

Brian Ellis¹  Hardy Hall² 

[1] Michael Smith Laboratories, University of British Columbia, V6T 1Z4, Vancouver, BC, Canada;Michael Smith Laboratories, University of British Columbia, V6T 1Z4, Vancouver, BC, Canada;Swedish University of Agricultural Sciences (SLU), 901 83, Umeå, Sweden;

关键词: Cell wall;    Anisotropy;    Growth kinematic profiling;    Transcriptome;    Microarray;    Arabidopsis;    Inflorescence stem;   

DOI  :  10.1186/1471-2229-13-14

 received in 2012-11-20, accepted in 2013-01-21,  发布年份 2013

来源: Springer

【 摘 要 】

BackgroundPlant cell walls are complex dynamic structures that play a vital role in coordinating the directional growth of plant tissues. The rapid elongation of the inflorescence stem in the model plant Arabidopsis thaliana is accompanied by radical changes in cell wall structure and chemistry, but analysis of the underlying mechanisms and identification of the genes that are involved has been hampered by difficulties in accurately sampling discrete developmental states along the developing stem.ResultsBy creating stem growth kinematic profiles for individual expanding Arabidopsis stems we have been able to harvest and pool developmentally-matched tissue samples, and to use these for comparative analysis of global transcript profiles at four distinct phases of stem growth: the period of elongation rate increase, the point of maximum growth rate, the point of stem growth cessation and the fully matured stem. The resulting profiles identify numerous genes whose expression is affected as the stem tissues pass through these defined growth transitions, including both novel loci and genes identified in earlier studies. Of particular note is the preponderance of highly active genes associated with secondary cell wall deposition in the region of stem growth cessation, and of genes associated with defence and stress responses in the fully mature stem.ConclusionsThe use of growth kinematic profiling to create tissue samples that are accurately positioned along the expansion growth continuum of Arabidopsis inflorescence stems establishes a new standard for transcript profiling analyses of such tissues. The resulting expression profiles identify a substantial number of genes whose expression is correlated for the first time with rapid cell wall extension and subsequent fortification, and thus provide an important new resource for plant biologists interested in gene discovery related to plant biomass accumulation.

【 授权许可】

CC BY   
© Hall and Ellis; licensee BioMed Central Ltd. 2013