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GhAGL15s, preferentially expressed during somatic embryogenesis, promote embryogenic callus formation in cotton (Gossypium hirsutum L.)

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Abstract

Somatic embryogenesis is a useful tool for gene transfer and propagation of plants. AGAMOUS-LIKE15 (AGL15) promotes somatic embryogenesis in many plant species. In this study, three homologous AGL15 genes were isolated from Gossypium hirsutum L., namely GhAGL15-1, GhAGL15-3, and GhAGL15-4. Their putative proteins contained a highly conserved MADS-box DNA-binding domain and a less conserved K domain. Phylogenetic analysis suggested that the three GhAGL15s clustered most closely with AGL15 proteins in other plants. Subcellular location analyses revealed that three GhAGL15s were localized in the nucleus. Furthermore, their expression levels increased following embryogenic callus induction, but sharply decreased during the embryoid stage. GhAGL15-1 and GhAGL15-3 were significantly induced by 2,4-D and kinetin, whereas GhAGL15-4 was only responsive to 2,4-D treatment. Over-expression of the three GhAGL15s in cotton callus improved callus quality and significantly increased the embryogenic callus formation rate, while GhAGL15-4 had the highest positive effect on the embryogenic callus formation rate (an increase from 38.1 to 65.2 %). These results suggest that over-expression of GhAGL15s enhances embryogenic potential of transgenic calli. Therefore, spatiotemporal manipulation of GhAGL15s expression may prove valuable in improving cotton transformation efficiency.

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Acknowledgments

We thank Dr. Jiahe Wu and Dr. Hamamah Islam Butt for critical reading the manuscript. This work was supported by the National Science Fund for Distinguished Young Scholars (31125020) and the Innovation Scientists and Technicians Troop Construction Projects of Henan Province.

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Authors and Affiliations

  1. State Key Laboratory of Cotton Biology, The Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, People’s Republic of China

    Zuoren Yang, Changfeng Li, Ye Wang, Chaojun Zhang, Zhixia Wu, Xueyan Zhang, Chuanliang Liu & Fuguang Li

  2. Cotton Research Institute, Anhui Academy of Agricultural Sciences, Anqing, 246003, Anhui, People’s Republic of China

    Changfeng Li

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  1. Zuoren Yang
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  2. Changfeng Li
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  3. Ye Wang
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Correspondence to Fuguang Li.

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Z. Yang and C. Li contributed equally to this work.

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Yang, Z., Li, C., Wang, Y. et al. GhAGL15s, preferentially expressed during somatic embryogenesis, promote embryogenic callus formation in cotton (Gossypium hirsutum L.). Mol Genet Genomics 289, 873–883 (2014). https://doi.org/10.1007/s00438-014-0856-y

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