数字农科院2.0

Overexpression of LT, an Oncoprotein Derived from the Polyomavirus SV40, Promotes Somatic Embryogenesis in Cotton

文献类型： 外文期刊

作者： Lu, Chao;Wei, Yunxiao;Meng, Zhigang;Liu, Yongming;Ali, Abid Muhammad;Liu, Qinfei;Abbas, Mubashir;Wang, Yanan;Liang, Chengzhen;Wang, Yuan;Zhang, Rui

作者机构：

关键词： upland cotton;LT gene;NEC (non-embryonic callus);EC (embryogenic callus);somatic embryogenesis

期刊名称： GENES

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年卷期： 2022 年 13 卷 5 期

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摘要： Although genetic transformation has opened up a new era for cotton molecular breeding, it still suffers from the limitation problem of long transformation periods, which slows down the generation of new cotton germplasms. In this study, LT gene (SV40 large T antigen), which promotes the transformation efficiency of animal cells, was codon-optimized. Its overexpression vector was transformed into cotton. It was observed that EC (embryogenic callus) formation period was 33% shorter and transformation efficiency was slightly higher in the LT T0 generation than that of control. RNA-seq data of NEC (non-embryonic callus) and EC from LT and control revealed that more DEGs (differential expression genes) in NEC were identified than that of EC, indicating LT mainly functioned in NEC. Further KEGG, GO, and transcription factor analyses showed that DEGs were significantly enriched in brassinosteroid biosynthesis pathways and that bHLH, MYB, and AP2/ERF were the top three gene families, which are involved in EC formation. In addition, the key genes related to the auxin pathway were differentially expressed only in LT overexpression NEC, which caused early response, biosynthesis, and transportation of the hormone, resulting in EC earlier formation. In summary, the results demonstrated that LT can promote somatic embryogenesis in cotton, which provides a new strategy for improving cotton transformation and shortening EC formation time.

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