The role of Class Ⅱ KNOX family in controlling compound leaf patterning in Medicago truncatula  

作　　者：Xiao Wang Juanjuan Zhang Maofeng Chai Lu Han Xiaohua Cao Jing Zhang Yiming Kong Chunxiang Fu Zeng‐Yu Wang Kirankumar SMysore Jiangqi Wen Chuanen Zhou 

机构地区：[1]The Key Laboratory of Plant Development and Environmental Adaptation Biology,Ministry of Education,School of Life Science,Shandong University,Qingdao 266237,China [2]Grassland Agri‐Husbandry Research Center,College of Grassland Science,Qingdao Agricultural University,Qingdao 266109,China [3]College of Life Sciences,Shandong Normal University,Jinan 250014,China [4]Key Laboratory of Biofuels,Qingdao Institute of Bioenergy and Bioprocess Technology,Chinese Academy of Sciences,Qingdao 266101,China [5]Institute of Agricultural Biosciences,Oklahoma State University,Ardmore 73401,Oklahoma,USA

出　　处：《Journal of Integrative Plant Biology》2023年第10期2279-2291,共13页植物学报（英文版）

基　　金：supported by grants from the National Natural Science Foundation of China (32170833, 31972958 and 32100284);Shandong Province (ZR2020KC018 and ZR202103010073)。

摘　　要：Compound leaf development requires the coordination of genetic factors, hormones, and other signals. In this study, we explored the functions of Class Ⅱ KNOTTED-like homeobox(KNOXII)genes in the model leguminous plant Medicago truncatula. Phenotypic and genetic analyses suggest that Mt KNOX4, 5 are able to repress leafet formation, while Mt KNOX3, 9, 10 are not involved in this developmental process. Further investigations have shown that Mt KNOX4 represses the CK signal transduction, which is downstream of Mt KNOXⅠ-mediated CK biosynthesis. Additionally,two boundary genes, FUSED COMPOUND LEAF1(orthologue of Arabidopsis Class M KNOX) and NO APICAL MERISTEM(orthologue of Arabidopsis CUP-SHAPED COTYLEDON), are necessary for Mt KNOX4-mediated compound leaf formation.These findings suggest, that among the members of Mt KNOXⅡ, Mt KNOX4 plays a crucial role in integrating the CK pathway and boundary regulators,providing new insights into the roles of Mt KNOXⅡ in regulating the elaboration of compound leaves in M. truncatula.

关 键 词：KNOTTED-like homeobox KNOXM NAM CYTOKININ compound leaf 

分 类 号：Q943[生物学—植物学]