This Article Full Text Full Text (PDF) Supplemental Data Author Profile All Versions of this Article: 21/4/1095    most recent tpc.108.065425v1 Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Related articles in Plant Cell Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Oikawa, T. Articles by Kyozuka, J. Search for Related Content PubMed PubMed Citation Articles by Oikawa, T. Articles by Kyozuka, J. Agricola Articles by Oikawa, T. Articles by Kyozuka, J.

Two-Step Regulation of LAX PANICLE1 Protein Accumulation in Axillary Meristem Formation in Rice^[W]

Graduate School of Agriculture and Life Sciences, University of Tokyo, Yayoi, Bunkyo, Tokyo 113-8657, Japan

¹ Address correspondence to akyozuka{at}mail.ecc.u-tokyo.ac.jp.

Axillary meristem (AM) formation is an important determinant of plant architecture. In rice (Oryza sativa), LAX PANICLE1 (LAX1) function is required for the generation of AM throughout the plant's lifespan. Here, we show a close relationship between AM initiation and leaf development; specifically, the plastochron 4 (P4) stage of leaf development is crucial for the proliferation of meristematic cells. Coincident with this, LAX1 expression starts in the axils of leaves at P4 stage. LAX1 mRNA accumulates in two to three layers of cells in the boundary region between the initiating AM and the shoot apical meristem. In lax1 mutants, the proliferation of meristematic cells is initiated but fails to progress into the formation of AM. The difference in sites of LAX1 mRNA expression and its action suggests non-cell-autonomous characteristics of LAX1 function. We found that LAX1 protein is trafficked to AM in a stage- and direction-specific manner. Furthermore, we present evidence that LAX1 protein movement is required for the full function of LAX1. Thus, we propose that LAX1 protein accumulates transiently in the initiating AM at P4 stage by a strict regulation of mRNA expression and a subsequent control of protein trafficking. This two-step regulation is crucial to the establishment of the new AM.

Related articles in Plant Cell:

Rice Axillary Meristem Formation Requires Directional Movement of LAX PANICLE1 Protein

Jennifer Mach
Plant Cell 2009 21: 1027. [Full Text]  

This article has been cited by other articles:

				J. Mach Rice Axillary Meristem Formation Requires Directional Movement of LAX PANICLE1 Protein PLANT CELL, April 1, 2009; 21(4): 1027 - 1027. [Full Text] [PDF]