《植物生理学报》 2013, 49(9): 833-846

高等植物特有的LBD基因的分子生物学功能研究进展

卢寰^1,2, 时振英^1,*

¹中国科学院上海生命科学研究院植物生理生态研究所, 上海200032; ²中国科学院大学, 北京100039

通信作者：时振英；E-mail: zyshi@sippe.ac.cn；Tel: 021-54924078

摘　要：

LATERAL ORGAN BOUNDARIES DOMAIN (LBD)基因家族是在拟南芥中发现的高等植物所特有的一类基因, 编码的蛋白中含有LATERAL ORGAN BOUNDARIES (LOB)结构域。LBD基因一般在侧生器官与茎尖分生组织的边界处、侧生器官的近轴面一侧的基部表达, 并呈现出在多种组织内特异性表达的特征, 暗示该类基因可能在植物的多种发育过程中发挥功能。LBD蛋白结构中除含有上述LOB结构域以外, 尚未发现其它已知功能的结构域的存在。目前, 已经在拟南芥中发现43个LBD基因, 而在玉米和水稻中各有35和43个LBD基因。根据LBD蛋白结构中是否含有亮氨酸拉链类似基序, 将LBD基因分为两类: 第一类(class I) LBD蛋白结构域中包含完整亮氨酸拉链基序; 第二类(class II) LBD蛋白结构域中不含亮氨酸拉链基序。本文就LBD基因的结构以及它们对高等植物生长发育的影响、LBD基因和植物激素的关系、LBD基因与miRNA的关系进行了系统的总结。

关键词：LBD基因; LOB结构域; 高等植物; 茎尖分生组织; 表达模式; 蛋白结构; 植物激素; miRNA

收稿：2013-05-07   修定：2013-06-27

资助：转基因生物新品种培育重大专项(2011ZX08009-003-003)和“十二五”农村领域国家科技计划(2012AA10A302-2)。

Research Progress on the Molecular Function of Plant-Specific LBD Gene

LU Huan^1,2, SHI Zhen-Ying^1,*

¹Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China; ²University of Chinese Academy of Sciences, Beijing 100039, China

Corresponding author: SHI Zhen-Ying; E-mail: zyshi@sippe.ac.cn; Tel: 021-54924078

Abstract:

The LATERAL ORGAN BOUNDARIES DOMAIN (LBD) gene family, which was firstly discovered in Arabidopsis thaliana, encodes a conserved higher plant-specific LATERAL ORGAN BOUNDARIES (LOB) domain-containing protein. LBD gene is expressed in a band of cells between lateral organs and the shoot apical meristem (SAM) or at the adaxial base of lateral organs formed from the SAM. The LBD genes show a variety of tissue-specific expression patterns, suggesting that they may function in diverse developmental processes. LBD protein doesn’t contain other recognizable functional motifs except for the LOB domain. Up to now, 43 members of the LBD gene family have been identified in Arabidopsis, whereas in rice (Oryza sativa) and maize (Zea mays), there are 35 and 43 LBD genes respectively. LBD genes contain two major classes which are characterized by the presence (class I) or absence (class II) of functional leucine-zipper-like motifs. In this review, we described the structure of LBD proteins, and functions of them on plant development are discussed. At the same time, the relationships among LBD genes, and those between LBD genes, plant hormones and miRNA were clarified systematically.

Key words: LBD gene; LOB domain; higher plant; shoot apical meristem (SAM); expression pattern; protein structure; miRNA; plant hormone