The Leaf Adaxial-Abaxial Boundary and Lamina Growth

Plants

Miyuki Nakata¹ 

关键词: leaf development;    the adaxial-abaxial boundary;    lamina growth;    leaf margin;    auxin;    the WOX family transcription factor;   

DOI  :  10.3390/plants2020174

来源: mdpi

【 摘 要 】

In multicellular organisms, boundaries have a role in preventing the intermingling of two different cell populations and in organizing the morphogenesis of organs and the entire organism. Plant leaves have two different cell populations, the adaxial (or upper) and abaxial (or lower) cell populations, and the boundary is considered to be important for lamina growth. At the boundary between the adaxial and abaxial epidermis, corresponding to the margin, margin-specific structures are developed and structurally separate the adaxial and abaxial epidermis from each other. The adaxial and abaxial cells are determined by the adaxial and abaxial regulatory genes (including transcription factors and small RNAs), respectively. Among many lamina-growth regulators identified by recent genetic analyses, it has been revealed that the phytohormone, auxin, and the WOX family transcription factors act at the adaxial-abaxial boundary downstream of the adaxial-abaxial pattern. Furthermore, mutant analyses of the WOX genes shed light on the role of the adaxial-abaxial boundary in preventing the mixing of the adaxial and abaxial features during lamina growth. In this review, we highlight the recent studies on the dual role of the adaxial-abaxial boundary.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.