RNA-seq analysis identifies an intricate regulatory network controlling cluster root development in white lupin
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- 作者：David Secco (33)
Huixia Shou (34) (35)
James Whelan (35) (36)
Oliver Berkowitz (33) (37)
33. Australian Research Council Centre of Excellence in Plant Energy Biology ; University of Western Australia ; Crawley ; WA ; 6009 ; Australia
34. State Key Laboratory of Plant Physiology and Biochemistry ; College of Life Sciences ; Zhejiang University ; Hangzhou ; 310058 ; China
35. Joint Research Laboratory in Genomics and Nutriomics ; College of Life Sciences ; Zhejiang University ; Hangzhou ; 310058 ; China
36. Department of Botany ; School of Life Science ; La Trobe University ; Bundoora ; Victoria ; 3086 ; Australia
37. School of Plant Biology ; University of Western Australia ; Crawley ; WA ; 6009 ; Australia - 关键词：Cluster root ; White lupin ; Root development ; Phosphate ; RNA ; seq ; de novo transcriptome
- 刊名：BMC Genomics
- 出版年：2014
- 出版时间：December 2014
- 年：2014
- 卷：15
- 期：1
- 全文大小：2,812 KB
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- 出版者：BioMed Central
- ISSN：1471-2164
文摘
Background Highly adapted plant species are able to alter their root architecture to improve nutrient uptake and thrive in environments with limited nutrient supply. Cluster roots (CRs) are specialised structures of dense lateral roots formed by several plant species for the effective mining of nutrient rich soil patches through a combination of increased surface area and exudation of carboxylates. White lupin is becoming a model-species allowing for the discovery of gene networks involved in CR development. A greater understanding of the underlying molecular mechanisms driving these developmental processes is important for the generation of smarter plants for a world with diminishing resources to improve food security. Results RNA-seq analyses for three developmental stages of the CR formed under phosphorus-limited conditions and two of non-cluster roots have been performed for white lupin. In total 133,045,174 high-quality paired-end reads were used for a de novo assembly of the root transcriptome and merged with LAGI01 (Lupinus albus gene index) to generate an improved LAGI02 with 65,097 functionally annotated contigs. This was followed by comparative gene expression analysis. We show marked differences in the transcriptional response across the various cluster root stages to adjust to phosphate limitation by increasing uptake capacity and adjusting metabolic pathways. Several transcription factors such as PLT, SCR, PHB, PHV or AUX/IAA with a known role in the control of meristem activity and developmental processes show an increased expression in the tip of the CR. Genes involved in hormonal responses (PIN, LAX, YUC) and cell cycle control (CYCA/B, CDK) are also differentially expressed. In addition, we identify primary transcripts of miRNAs with established function in the root meristem. Conclusions Our gene expression analysis shows an intricate network of transcription factors and plant hormones controlling CR initiation and formation. In addition, functional differences between the different CR developmental stages in the acclimation to phosphorus starvation have been identified.