Combined proteomic and transcriptomic analysis identifies differentially expressed pathways associated to Pinus radiata needle maturation.
Needle differentiation is a very complex process that leads to the formation of a mature photosynthetic organ from pluripotent needle primordia. The proteome and transcriptome of immature and fully developed needles of Pinus radiata D. Don were compared to described changes in mRNA and protein species that characterize the needle maturation developmental process. A total of 856 protein spots were analyzed, defining a total of 280 spots as differential between developmental stages, from which 127 were confidently identified. A suppressive subtractive library (2048 clones, 274 non redundant contigs) was built, and 176 genes showed to be differentially expressed. The Joint data analysis of proteomic and transcriptomic results provided a broad overview of differentially expressed pathways associated with needle maturation and stress-related pathways. Proteins and genes related to energy metabolism pathways, photosynthesis, and oxidative phosphorylation were overexpressed in mature needles. Amino acid metabolism, transcription, and translation pathways were overexpressed in immature needles. Interestingly, stress related proteins were characteristic of immature tissues, a fact that may be linked to defense mechanisms and the higher growth rate and morphogenetic competence exhibited by these needles. Thus, this work provides an overview of the molecular changes affecting proteomes and transcriptomes during P. radiata needle maturation, having an integrative vision of the functioning and physiology of this process.
EPIPHYSAGE Research Group, Area de Fisiología Vegetal, Departamento B.O.S., Instituto Universitario de Biotecnología de Asturias (IUBA), Universidad de Oviedo, Oviedo, Spain. luis@valledor.info
Luis
L
Valledor
Jesús V
JV
Jorrín
Jose Luis
JL
Rodríguez
Christof
C
Lenz
Mónica
M
Meijón
Roberto
R
Rodríguez
Maria Jesús
MJ
Cañal
D000596:Amino Acids / Q000378:metabolism; D016000:Cluster Analysis; D019295:Computational Biology; D015180:Electrophoresis, Gel, Two-Dimensional; D004734:Energy Metabolism / Q000502:physiology; D020869:Gene Expression Profiling / Q000379:methods*; D015723:Gene Library; D015151:Immunoblotting; D053858:Metabolic Networks and Pathways / Q000502:physiology; D010085:Oxidative Phosphorylation; D010788:Photosynthesis / Q000502:physiology; D028223:Pinus; D018515:Plant Leaves / Q000254:growth & development* / Q000378:metabolism*; D010940:Plant Proteins / Q000032:analysis*; D025341:Principal Component Analysis; D040901:Proteomics / Q000379:methods*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017422:Sequence Analysis, DNA
D000596:Amino Acids; D010940:Plant Proteins