Abstract:
UNLABELLED:In this study, a comparative proteomic analysis was employed to identify fuzz fiber initiation-related proteins in wild-type diploid cotton (Gossypium arboreum L.) and its fuzzless mutant. Temporal changes in global proteomes were examined using 2-DE at five developmental time points for fuzz fiber initiation, and 71 differentially expressed protein species were identified by MS, 45 of which were preferentially accumulated in the wild-type. These proteins were assigned to several functional categories, mainly in cell response/signal transduction, redox homeostasis, protein metabolism and energy/carbohydrate metabolism. It was remarkable that more than ten key proteins with high-abundance were involved in gibberellic acid (GA) signaling and ROS scavenging, and increasing concentrations of active GAs and H2O2 were also detected approximately 5dpa in wild type ovules. Furthermore, in vivo GA and H2O2 treatments of ovules inside young bolls showed that these compounds can synergistically promote fuzz fiber initiation. Our findings not only described a dynamic protein network supporting fuzz initiation in diploid cotton fiber ovules, but also deepened our understanding of the molecular basis of cotton fiber initiation. BIOLOGICAL SIGNIFICANCE:Our study reported the identification of differentially expressed proteins in wild-type diploid cotton (G. arboreum L.) and its fuzzless mutant by comparative proteomic approach. In total, 71 protein species related to fuzz initiation were identified by MS. These proteins were assigned to several functional categories, mainly in energy/carbohydrate metabolism, protein metabolism, signal transduction, redox homeostasis etc. Importantly, a number of key proteins were found to be associated with GA signaling and ROS scavenging. In consistence with these findings, we detected the increase of GAs and H2O2 concentrations during fiber initiation, and our in vivo ovule experiments with GA and H2O2 injection and following microscopy observation of fuzz fiber initiation supported promoting effects of GA and H2O2 on cotton fiber initiation. These findings depicted a dynamic protein network supporting cotton fiber initiation in diploid cotton ovules. Our study is of major significance for understanding the molecular mechanisms controlling fuzz initiation and also provides a solid basis for further functional research of single nodes of this network in relation to cotton fiber initiation.
journal_name
J Proteomicsjournal_title
Journal of proteomicsauthors
Du SJ,Dong CJ,Zhang B,Lai TF,Du XM,Liu JYdoi
10.1016/j.jprot.2013.02.020subject
Has Abstractpub_date
2013-04-26 00:00:00pages
113-29eissn
1874-3919issn
1876-7737pii
S1874-3919(13)00095-Xjournal_volume
82pub_type
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