Cotton (Gossypium spp.) is the most important natural textile fiber crop in the world.The ideal plant architecture of cotton is suitable for mechanical harvesting and productivity in modern agricultural production.How...Cotton (Gossypium spp.) is the most important natural textile fiber crop in the world.The ideal plant architecture of cotton is suitable for mechanical harvesting and productivity in modern agricultural production.However,cotton genes regulating plant development and architecture have not been fully identified.We identified a basic helix-loop-helix (b HLH) transcription factor,GhPAS1 (PAGODA1 SUPPRESSOR1) in G.hirsutum (Upland cotton).GhPAS1 was located in the nucleus and showed a strong transcription activation effect.Tissue-specific expression patterns showed that GhPAS1 was highly expressed in floral organs,followed by high expression in early stages of ovule development and rapid fiber elongation.GhPAS1 overexpression in Arabidopsis and BRZ (brassinazole,BR biosynthesis inhibitor) treatment indicated that GhPAS1 positively regulates and responds to the BR (brassinosteroid) signaling pathway and promotes cell elongation.GhPAS1 overexpression in Arabidopsis mediated plant development in addition to increasing plant biomass.Virus-induced gene silencing of GhPAS1 indicated that down-regulation of GhPAS1 inhibited cotton growth and development,as plant height,fruit branch length,and boll size of silenced plants were lower than in control plants.Fiber length and seed yield were also lower in silenced plants.We conclude that GhPAS1,a b HLH transcription factor,regulates plant development and architecture in cotton.These findings may help breeders and researchers develop cotton cultivars with desirable agronomic characteristics.展开更多
Brassinosteroids(BRs), which are essential phytohormones for plant growth and development, are important for cotton fiber development. Additionally, BES1 transcription factors are critical for BR signal transduction. ...Brassinosteroids(BRs), which are essential phytohormones for plant growth and development, are important for cotton fiber development. Additionally, BES1 transcription factors are critical for BR signal transduction. However, cotton BES1 family genes have not been comprehensively characterized. In this study, we identified 11 BES1 genes in G. arboreum, 11 in G.raimondii, 16 in G. barbadense, and 22 in G. hirsutum. The BES1 sequences were significantly conserved in the Arabidopsis thaliana, rice, and upland cotton genomes. A total of 94 BES1 genes from 10 different plant species were divided into three clades according to the neighbor-joining and minimum-evolution methods. Moreover, the exon/intron patterns and motif distributions were highly conserved among the A. thaliana and cotton BES1 genes. The collinearity among the orthologs from the At and Dt subgenomes was estimated. Segmental duplications in the At and Dt subgenomes were primarily responsible for the expansion of the cotton BES1 gene family. Of the GhBES1 genes, GhBES1.4_At/Dt exhibited BL-induced expression and was predominantly expressed in fibers. Furthermore, Col-0/mGhBES1.4_At plants produced curled leaves with long and bent petioles. These transgenic plants also exhibited decreased hypocotyl sensitivity to brassinazole and constitutive BR induced/repressed gene expression patterns. The constitutive BR responses of the plants overexpressing mGhBES1.4_At were similar to those of the bes1-D mutant.展开更多
Drought stress results in significant losses in agricultural production, and especially that of cotton. The molecular mechanisms that coordinate drought tolerance remain elusive in cotton. Here, we isolated a drought-...Drought stress results in significant losses in agricultural production, and especially that of cotton. The molecular mechanisms that coordinate drought tolerance remain elusive in cotton. Here, we isolated a drought-response gene GhKLCR1, which is a close homolog of AtKLCR1, which encodes a kinesin light chain-related protein enriched with a tetratrico peptide-repeat region.A subcellular localization assay showed that GhKLCR1 is associated with the cell membrane. A tissue-specific expression profile analysis demonstrated that GhKLCR1 is a cotton root-specific gene. Further abiotic and hormonal stress treatments showed that GhKLCR1 was upregulated during abiotic stresses, especially after polyethylene glycol treatments. In addition, the glucuronidase(GUS) staining activity increased as the increment of mannitol concentration in transgenic Arabidopsis plants harboring the fusion construct PGhKLCR1::GUS. The root lengths of 35 S::GhKLCR1 lines were significantly reduced compared with that of wild type. Additionally, seed germination was strongly inhibited in 35 S::GhKLCR1 lines after 300-mmol L^(-1) mannitol treatments as compared with Columbia-0, indicating the sensitivity of GhKLCR1 to drought. These findings provide a better understanding of the structural, physiological and functional mechanisms of kinesin light chain-related proteins.展开更多
基金supported by the Funds for Creative Research Groups of China (31621005)the National Transgenic Major Project of China (2018ZX0800921B)。
文摘Cotton (Gossypium spp.) is the most important natural textile fiber crop in the world.The ideal plant architecture of cotton is suitable for mechanical harvesting and productivity in modern agricultural production.However,cotton genes regulating plant development and architecture have not been fully identified.We identified a basic helix-loop-helix (b HLH) transcription factor,GhPAS1 (PAGODA1 SUPPRESSOR1) in G.hirsutum (Upland cotton).GhPAS1 was located in the nucleus and showed a strong transcription activation effect.Tissue-specific expression patterns showed that GhPAS1 was highly expressed in floral organs,followed by high expression in early stages of ovule development and rapid fiber elongation.GhPAS1 overexpression in Arabidopsis and BRZ (brassinazole,BR biosynthesis inhibitor) treatment indicated that GhPAS1 positively regulates and responds to the BR (brassinosteroid) signaling pathway and promotes cell elongation.GhPAS1 overexpression in Arabidopsis mediated plant development in addition to increasing plant biomass.Virus-induced gene silencing of GhPAS1 indicated that down-regulation of GhPAS1 inhibited cotton growth and development,as plant height,fruit branch length,and boll size of silenced plants were lower than in control plants.Fiber length and seed yield were also lower in silenced plants.We conclude that GhPAS1,a b HLH transcription factor,regulates plant development and architecture in cotton.These findings may help breeders and researchers develop cotton cultivars with desirable agronomic characteristics.
基金supported by the National Natural Science Foundation of China (31501345)Young Elite Scientist Sponsorship Program by CAST (China Association for Science and Technology)
文摘Brassinosteroids(BRs), which are essential phytohormones for plant growth and development, are important for cotton fiber development. Additionally, BES1 transcription factors are critical for BR signal transduction. However, cotton BES1 family genes have not been comprehensively characterized. In this study, we identified 11 BES1 genes in G. arboreum, 11 in G.raimondii, 16 in G. barbadense, and 22 in G. hirsutum. The BES1 sequences were significantly conserved in the Arabidopsis thaliana, rice, and upland cotton genomes. A total of 94 BES1 genes from 10 different plant species were divided into three clades according to the neighbor-joining and minimum-evolution methods. Moreover, the exon/intron patterns and motif distributions were highly conserved among the A. thaliana and cotton BES1 genes. The collinearity among the orthologs from the At and Dt subgenomes was estimated. Segmental duplications in the At and Dt subgenomes were primarily responsible for the expansion of the cotton BES1 gene family. Of the GhBES1 genes, GhBES1.4_At/Dt exhibited BL-induced expression and was predominantly expressed in fibers. Furthermore, Col-0/mGhBES1.4_At plants produced curled leaves with long and bent petioles. These transgenic plants also exhibited decreased hypocotyl sensitivity to brassinazole and constitutive BR induced/repressed gene expression patterns. The constitutive BR responses of the plants overexpressing mGhBES1.4_At were similar to those of the bes1-D mutant.
基金supported by the National Natural Science Foundation of China (31501345)
文摘Drought stress results in significant losses in agricultural production, and especially that of cotton. The molecular mechanisms that coordinate drought tolerance remain elusive in cotton. Here, we isolated a drought-response gene GhKLCR1, which is a close homolog of AtKLCR1, which encodes a kinesin light chain-related protein enriched with a tetratrico peptide-repeat region.A subcellular localization assay showed that GhKLCR1 is associated with the cell membrane. A tissue-specific expression profile analysis demonstrated that GhKLCR1 is a cotton root-specific gene. Further abiotic and hormonal stress treatments showed that GhKLCR1 was upregulated during abiotic stresses, especially after polyethylene glycol treatments. In addition, the glucuronidase(GUS) staining activity increased as the increment of mannitol concentration in transgenic Arabidopsis plants harboring the fusion construct PGhKLCR1::GUS. The root lengths of 35 S::GhKLCR1 lines were significantly reduced compared with that of wild type. Additionally, seed germination was strongly inhibited in 35 S::GhKLCR1 lines after 300-mmol L^(-1) mannitol treatments as compared with Columbia-0, indicating the sensitivity of GhKLCR1 to drought. These findings provide a better understanding of the structural, physiological and functional mechanisms of kinesin light chain-related proteins.
