... heterogeneous in the leaf blade than in the midrib and petiole, correlating with higher local differences in growth rates between neighboring cells in the blade. This local growth variability coincides with developing stomata. Stomatal lineages follow a specific, time-dependent growth program that is different...

...Phillip A. Conklin; Robyn Johnston; Brianne R. Conlon; Rena Shimizu; Michael J. Scanlon ABSTRACT The mechanisms whereby leaf anlagen undergo proliferative growth and expansion to form wide, flat leaves are unclear. The maize gene NARROWSHEATH1 ( NS1 ) is a WUSCHEL-related homeobox3 ( WOX3 ) homolog...

.... Leaves exemplify this challenge as they combine differences in their overall shape with smaller shape variations at their margin, leading to lobes or teeth. Current methods based on contour or on landmark analysis are successful in quantifying either overall leaf shape or leaf margin dissection, but fail...

... branch angle in the dominant mutant. wab1 mRNA is expressed at the base of branches in the inflorescence and is necessary for LG1 expression. wab1 is not expressed in leaves, except in the dominant mutant. The domain of wab1 expression in the Wab1-R leaf closely mirrors the accumulation of LG1. Although...

... sizes and forms. This process is regulated by plant hormones, transcriptional regulators and mechanical properties of the tissue. Here, we review recent advances in the understanding of how these factors modulate leaf development to yield a substantial diversity of leaf forms. We discuss these issues...

... in the coordination of cell proliferation in Arabidopsis leaves. In leaf primordia, miR396 is expressed at low levels that steadily increase during organ development. We found that miR396 antagonizes the expression pattern of its targets, the GROWTH-REGULATING FACTOR ( GRF ) transcription factors. miR396 accumulates...

... adjacent epidermal cells, while the R3-MYB, CPC, does move to neighboring cells. These data support a model for the TTG1 complex directly regulating activators and repressors and the movement of repressors to affect trichome patterning on the Arabidopsis leaf. The gene expression studies presented above...

...Michelle T. Juarez; Richard W. Twigg; Marja C. P. Timmermans Dorsoventral (adaxial/abaxial) polarity of the maize leaf is established in the meristem and is maintained throughout organ development to coordinate proper outgrowth and patterning of the leaf. rolled leaf1 ( rld1 ) and leafbladeless1...

... have large vacuoles, thin cell walls, and lack chloroplasts, therefore, they appear to resemble epidermal cells instead of any of the internal cell types. In order to determine the biochemical identity of the extra cell layers in Xcl1 mutant leaf blades, immunolocalizations were performed using cell...

... of cell division patterns. Moreover, whereas altered cell division in the apical meristem had no influence on organogenesis, local induction of cell proliferation on the flanks of young leaf primordia led to a dramatic change in lamina development and, thus, leaf shape. These data indicate that the role...

... leaves were adjacent to another trichome ( Table 1 ); however, the number of sites on the leaf containing at least one trichome (trichome initiation sites, TIS) was approximately the same as was seen on WT leaves. No other aspects of plant growth and development appeared to be affected. In particular...

...Toshi Foster; Bruce Veit; Sarah Hake ABSTRACT Maize leaves are organized into two major domains along the proximal-distal axis: a broad flat blade at the distal end of the leaf, and a narrow, thickened sheath that encircles the stem. Between the blade and sheath are two wedge-shaped tissues called...

...Hirokazu Tsukaya ABSTRACT One-leaf plants, belonging to the family Gesneriaceae, were described for the first time more than 150 years ago. One such unusual plant, Monophyllaea , has only one leaf at maturity. Only one of the two cotyledons grows continuously, without the formation of true leaves...