RNA-seq analysis revealed key genes associated with salt tolerance in rapeseed germination through carbohydrate metabolism, hormone, and MAPK signaling pathways

Abstract Background Salt stress is one of the most damaging abiotic stresses in production of Upland cotton (Gossypium hirsutum). Upland cotton is defined as a medium salt-tolerant crop. Salinity hinders root development, shoots growth, and reduces the fiber quality. Results Our previous study verified a GhCIPK6a gene response to salt stress in G. hirsutum. The homologs of GhCIPK6a were analyzed in A2 (G. arboreum), D5 (G. raimondii), and AD1 (G. hirsutum) genomes. GhCIPK6a localized to the vacuole and cell membrane. The GhCBL1-GhCIPK6a and GhCBL8-GhCIPK6a complexes localized to the nucleus and cytomembrane. Overexpression of GhCIPK6a enhanced expression levels of co-expressed genes induced by salt stress, which scavenged ROS and involved in MAPK signaling pathways verified by RNA-seq analysis. Water absorption capacity and cell membrane stability of seeds from GhCIPK6a overexpressed lines was higher than that of wild-type seeds during imbibed germination stage. The seed germination rates and seedling field emergence percentages of GhCIPK6a overexpressed lines were higher than that of control line under salt stress. Moreover, overexpressing of GhCIPK6a in cotton increased lint percentage, and fiber length uniformity under salt stress. Conclusions We verified the function of GhCIPK6a by transformation and RNA-seq analysis. GhCIPK6a overexpressed lines exhibited higher tolerance to abiotic stresses, which functioned by involving in ROS scavenging and MAPK pathways. Therefore, GhCIPK6a has the potential for cotton breeding to improve stress-tolerance.

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GhCIPK6 Increases Salt Tolerance in Transgenic Upland Cotton by Involving in ROS Scavenging and MAPK Signaling Pathways

10.21203/rs.3.rs-19587/v2 ◽

2020 ◽

Author(s):

Ying Su ◽

Anhui Guo ◽

Yi Huang ◽

Yumei Wang ◽

Jinping Hua

Keyword(s):

Salt Stress ◽

Cell Membrane ◽

Signaling Pathways ◽

Abiotic Stresses ◽

Upland Cotton ◽

Mapk Signaling ◽

Control Line ◽

Rna Seq ◽

Ros Scavenging ◽

Mapk Signaling Pathways

Abstract Background: Salt stress is one of the most damaging abiotic stresses in production of Upland cotton ( Gossypium hirsutum ). Upland cotton is defined as a medium salt-tolerant crop. Salinity hinders root development, shoots growth, and reduces the fiber quality. Results: Our previous study verified a GhCIPK6 gene response to salt stress in G. hirsutum . The homologs of GhCIPK6 were analyzed in A 2 ( G. arboreum ), D 5 ( G . raimondii ), and AD 1 ( G . hirsutum ) genomes. GhCIPK6 localized to the vacuole and cell membrane. The GhCBL1-GhCIPK6 and GhCBL8-GhCIPK6 complexes localized to the nucleus and cytomembrane. Overexpression of GhCIPK6 enhanced expression levels of co-expressed genes induced by salt stress, which scavenged ROS and involved in MAPK signaling pathways verified by RNA-seq analysis. Water absorption capacity and cell membrane stability of seeds from GhCIPK6 overexpressed lines was higher than that of wild-type seeds during imbibed germination stage. The seed germination rates and seedling field emergence percentages of GhCIPK6 overexpressed lines were higher than that of control line under salt stress. Moreover, overexpressing of GhCIPK6 in cotton increased lint percentage, and fiber length uniformity under salt stress. Conclusions: We verified the function of GhCIPK6 by transformation and RNA-seq analysis. GhCIPK6 overexpressed lines exhibited higher tolerance to abiotic stresses, which functioned by involving in ROS scavenging and MAPK pathways. Therefore, GhCIPK6 has the potential for cotton breeding to improve stress-tolerance.

Download Full-text