title: Analyzing serial cDNA libraries revealed reactive oxygen species and gibberellins signaling pathways in the salt response of Upland cotton (Gossypium hirsutum L.).
abstract: By comparing series full-length cDNA libraries stressed and control, the dynamic process of salt stress response in Upland cotton was studied, and reactive oxygen species and gibberellins signaling pathways were proposed. The Upland cotton is the most important fiber plant with highly salt tolerance. However, the molecular mechanism underlying salt tolerance in domesticated cotton was unclear. Here, seven full-length cDNA libraries were constructed for seedling roots of Upland cotton 'Zhong G 5' at 0, 3, 12 and 48 h after the treatment of control or 150 mM NaCl stress. About 3300 colonies in each library were selected robotically for 5'-end pyrosequencing, resulting in 20,358 expressed sequence tags (ESTs) totally. And 8516 uniESTs were then assembled, including 2914 contigs and 5602 singletons, and explored for Gene Ontology (GO) function. GO comparison between serial stress libraries and control reflected the growth regulation, stimulus response, signal transduction and biology regulation processes were conducted dynamically in response to salt stress. MYB, MYB-related, WRKY, bHLH, GRAS and ERF families of transcription factors were significantly enriched in the early response. 65 differentially expressed genes (DEGs), mainly associated with reactive oxygen species (ROS) scavenging, gibberellins (GAs) metabolism, signal transduction, transcription regulation, stress response and transmembrane transport, were identified and confirmed by quantitative real-time PCR. Overexpression of selected DEGs increased tolerance against salt stress in transgenic yeast. Results in this study supported that a ROS-GAs interacting signaling pathway of salt stress response was activated in Upland cotton. Our results provided valuable gene resources for further investigation of the molecular mechanism of salinity tolerance.
authors.affiliation: Key Lab of Crop Heterosis and Utilization of Ministry of Education, College of Agronomy and Biotechnology, Beijing Key Lab of Crop Genetic Improvement, China Agricultural University, Beijing, 100193, China, shi-850411@163.com.
authors.forename: Gongyao
authors.initials: G
authors.lastname: Shi
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Guo
authors.forename: Jinyan
authors.initials: J
authors.lastname: Guo
authors.forename: Laihua
authors.initials: L
authors.lastname: Liu
authors.forename: Jinping
authors.initials: J
authors.lastname: Hua
mesh_terms: D020224:Expressed Sequence Tags; D018506:Gene Expression Regulation, Plant; D015723:Gene Library; D063990:Gene Ontology; D005875:Gibberellins / Q000235:genetics / Q000378:metabolism*; D003368:Gossypium / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D018517:Plant Roots / Q000235:genetics; D017382:Reactive Oxygen Species / Q000378:metabolism*; D060888:Real-Time Polymerase Chain Reaction / Q000379:methods; D055049:Salt Tolerance / Q000235:genetics / Q000502:physiology*; D055051:Salt-Tolerant Plants / Q000235:genetics; D015398:Signal Transduction / Q000235:genetics; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism
chemical_list: D005875:Gibberellins; D017382:Reactive Oxygen Species; D014157:Transcription Factors