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The antagonistic or synchronous relationship between ASL/LBD and KNOX homeobox members

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Abstract

The formation and the development of the lateral organs require the expression of organ-specific genes. On the other hand, meristem-specific genes are repressed to complete the differentiation of the organs. KNOTTED-like home-obox (KNOX) genes have been isolated from several plant species. Genetic analysis has demonstrated the role of KNOX class I genes in the formation and maintenance of the shoot apical meristems (SAMs). The ASYMMETRIC LEAVES2 (AS2)/LATERAL ORGAN BOUNDARIES (LOB) gene of Arabidopsis defines a novel conserved protein domain. LOB, the founding member of this gene family, is considered as playing a role in boundary establishment or communication between the meristems and initiating lateral organs. With organ initiation, roles of LBD genes (such as AS2, ASL1) cause that the expression of KNOX genes is downregulated in later organ, this downregulation is critical for the leaf primordial development and subsequently proper explanation of leaf blades. However,JLO/LBD30 misexpression induces ectopic expression of KNOX genes, i.e., STM and KNAT1, and overexpression of ASL11/LBD15 and ASL38/LBD41 cockscomb plants causes lob leaves and pin-like-SAMs, suggesting LBD genes play a novel role in lateral organ development. A possibility is JLO/LBD30 as an LBD transcription factor can coordinate two processes (Auxin accumulation and loss of meristem-specific gene expression in organ primordial) by controlling both auxin transport and the expression of KNOX genes. Thus, this review mainly addresses how the antagonistic or synchronous relationship between ASL/LBD and homeobox members forms complex signaling networks.

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  1. The Key Laboratory of Biotechnology for Medicinal Plant of Jiangsu Province, School of Life Science, Jiangsu Normal University, Xuzhou, Jiangsu, 221116, People’s Republic of China

    Lai-Sheng Meng, Xiao-Ying Cao, Meng-Qian Liu & Ji-Hong Jiang

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Meng, LS., Cao, XY., Liu, MQ. et al. The antagonistic or synchronous relationship between ASL/LBD and KNOX homeobox members. Biologia 72, 486–493 (2017). https://doi.org/10.1515/biolog-2017-0058

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