Tsiantis M, Schneeberger R, Golz J F, Freeling M, Langdale J A
Department of Plant Sciences, University of Oxford, South Parks Road, Oxford OX1 3BR, UK.
Science. 1999 Apr 2;284(5411):154-6. doi: 10.1126/science.284.5411.154.
Leaves of higher plants develop in a sequential manner from the shoot apical meristem. Previously it was determined that perturbed leaf development in maize rough sheath2 (rs2) mutant plants results from ectopic expression of knotted1-like (knox) homeobox genes. Here, the rs2 gene sequence was found to be similar to the Antirrhinum PHANTASTICA (PHAN) gene sequence, which encodes a Myb-like transcription factor. RS2 and PHAN are both required to prevent the accumulation of knox gene products in maize and Antirrhinum leaves, respectively. However, rs2 and phan mutant phenotypes differ, highlighting fundamental differences in monocot and dicot leaf development programs.
高等植物的叶子从茎尖分生组织开始依次发育。先前已确定，玉米粗糙叶鞘2（rs2）突变体植株中叶片发育异常是由于类结瘤1（knox）同源异型盒基因的异位表达所致。在此，发现rs2基因序列与金鱼草的PHANTASTICA（PHAN）基因序列相似，后者编码一种Myb样转录因子。RS2和PHAN分别是防止knox基因产物在玉米和金鱼草叶片中积累所必需的。然而，rs2和phan突变体表型不同，这突出了单子叶和双子叶植物叶片发育程序的根本差异。
