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- W2897734376 abstract "In citrus, genetic improvement via biotechnology is challenging due to insufficient understanding of molecular barriers that prevent regeneration by somatic embryogenesis (SE). Our previous study indicated that LEC genes were involved in SE in citrus, but their regulatory roles remain to be elucidated. Here, we cloned one of the LEC genes, CsFUS3, and show that it is preferentially expressed during SE and in the embryogenic callus (EC) derived from citrus varieties with strong embryogenic competence. The overexpression of CsFUS3 in recalcitrant citrus callus restored embryogenic competence. Complementation of the loss-of-function Arabidopsis fus3 mutant with the CsFUS3 gene restored normal late embryogenesis, which is consistent with the CsFUS3 and AtFUS3 proteins contributing to the same regulatory network in Arabidopsis. Transcriptome profiling revealed that the expression of particular TFs that promote SE was up-regulated in the citrus overexpression (OE) line. The 104 differentially expressed genes associated with hormone biosynthesis, catabolism, and signaling are particularly noteworthy. The dynamic change in the ratio of ABA to GA during SE in wild-type callus mirrored the expression pattern of CsFUS3. In contrast, in the OE line, the ratio of ABA to GA was higher and the capacity for SE was greater when the OE line was separately treated with ABA and GA biosynthesis inhibitors. Taken together, our results demonstrate that the overexpression of CsFUS3 appears to establish a cellular environment favorable to SE, at least in part by promoting a high ABA to GA ratio and by regulating the expression of TFs that promote SE." @default.
- W2897734376 created "2018-10-26" @default.
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- W2897734376 date "2018-12-01" @default.
- W2897734376 modified "2023-10-18" @default.
- W2897734376 title "Overexpression of the CsFUS3 gene encoding a B3 transcription factor promotes somatic embryogenesis in Citrus" @default.
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- W2897734376 doi "https://doi.org/10.1016/j.plantsci.2018.10.015" @default.
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