RWP-RK Domain 3 (OsRKD3) induces somatic embryogenesis in black rice

BMC Plant Biology

卷:23

Research

Putri Wijayanti¹  Windi Mose²  Febri Adi Susanto³  Anisa Nazera Fauzia³  Yekti Asih Purwestri⁴  Tri Rini Nuringtyas⁴  Yang-Seok Lee⁵  Hadi Lanang Putra⁵  Cathal Meehan⁵  Jose Gutierrez-Marcos⁵  Nosheen Hussain⁵ 

[1] Department of Tropical Biology, Faculty of Biology, Universitas Gadjah Mada Jl. Teknika Selatan, Sekip Utara, 55281, Yogyakarta, Indonesia;

[2] Department of Tropical Biology, Faculty of Biology, Universitas Gadjah Mada Jl. Teknika Selatan, Sekip Utara, 55281, Yogyakarta, Indonesia;School of Life Sciences, University of Warwick, CV4 7AL, Coventry, UK;Research Center for Biotechnology, Universitas Gadjah Mada Jl. Teknika Utara, Depok, Sleman, 55281, Yogyakarta, Indonesia;

[3] Research Center for Biotechnology, Universitas Gadjah Mada Jl. Teknika Utara, Depok, Sleman, 55281, Yogyakarta, Indonesia;

[4] Research Center for Biotechnology, Universitas Gadjah Mada Jl. Teknika Utara, Depok, Sleman, 55281, Yogyakarta, Indonesia;Department of Tropical Biology, Faculty of Biology, Universitas Gadjah Mada Jl. Teknika Selatan, Sekip Utara, 55281, Yogyakarta, Indonesia;

[5] School of Life Sciences, University of Warwick, CV4 7AL, Coventry, UK;

关键词: Cell reprogramming;    Tissue regeneration;    Somatic embryogenesis;    Transformation;    Black rice;   

DOI  :  10.1186/s12870-023-04220-z

 received in 2023-02-03, accepted in 2023-04-07,  发布年份 2023

来源: Springer

【 摘 要 】

BackgroundPlants have the unique capability to form embryos from both gametes and somatic cells, with the latter process known as somatic embryogenesis. Somatic embryogenesis (SE) can be induced by exposing plant tissues to exogenous growth regulators or by the ectopic activation of embryogenic transcription factors. Recent studies have revealed that a discrete group of RWP-RK DOMAIN-CONTAINING PROTEIN (RKD) transcription factors act as key regulators of germ cell differentiation and embryo development in land plants. The ectopic overexpression of reproductive RKDs is associated with increased cellular proliferation and the formation of somatic embryo-like structures that bypass the need for exogenous growth regulators. However, the precise molecular mechanisms implicated in the induction of somatic embryogenesis by RKD transcription factors remains unknown.ResultsIn silico analyses have identified a rice RWP-RK transcription factor, named Oryza sativa RKD3 (OsRKD3), which is closely related to Arabidopsis thaliana RKD4 (AtRKD4) and Marchantia polymorpha RKD (MpRKD) proteins. Our study demonstrates that the ectopic overexpression of OsRKD3, which is expressed preferentially in reproductive tissues, can trigger the formation of somatic embryos in an Indonesian black rice landrace (Cempo Ireng) that is normally resistant to somatic embryogenesis. By analyzing the transcriptome of induced tissue, we identified 5,991 genes that exhibit differential expression in response to OsRKD3 induction. Among these genes, 50% were up-regulated while the other half were down-regulated. Notably, approximately 37.5% of the up-regulated genes contained a sequence motif in their promoter region, which was also observed in RKD targets from Arabidopsis. Furthermore, OsRKD3 was shown to mediate the transcriptional activation of a discrete gene network, which includes several transcription factors such as APETALA 2-like (AP2-like)/ETHYLENE RESPONSE FACTOR (ERF), MYB and CONSTANS-like (COL), and chromatin remodeling factors associated with hormone signal transduction, stress responses and post-embryonic pathways.ConclusionsOur data show that OsRKD3 modulates an extensive gene network and its activation is associated with the initiation of a somatic embryonic program that facilitates genetic transformation in black rice. These findings hold substantial promise for improving crop productivity and advancing agricultural practices in black rice.

【 授权许可】

CC BY   
© The Author(s) 2023

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