Format

Send to

Choose Destination
Dev Biol. 2005 Jun 15;282(2):455-66.

Radial leaves of the maize mutant ragged seedling2 retain dorsiventral anatomy.

Author information

1
Department of Plant Biology, University of Georgia, Athens, GA 30602, USA.

Abstract

ragged seedling2 (rgd2) is a novel, recessive mutation affecting lateral organ development in maize. The mutant phenotype of homozygous rgd2-R leaves is variable. Mild leaf phenotypes have a reduced midrib and may be moderately narrow and furcated; severe Rgd2-R(-) leaves are filamentous or even radial. Despite their radial morphology, severe Rgd2-R(-) mutant leaves develop distinct adaxial and abaxial anatomical features. Although Rgd2-R(-) mutants exhibit no reduction in adaxial or abaxial cell types, areas of epidermal cell swapping may occur that are associated with misaligned vascular bundles and outgrowths of ectopic margins. Scanning electron microscopy of young primordia and analyses of leaf developmental-marker gene expression in mutant apices reveal that RGD2 functions during recruitment of leaf founder cells and during expansive growth of leaf primordia. Overall, these phenotypes suggest that development is uncoordinated in Rgd2-R(-) mutant leaves, so that leaf components and tissues may develop quasi-independently. Models whereby RGD2 is required for developmental signaling during the initiation, anatomical patterning, and lateral expansion of maize leaves are discussed.

PMID:
15950610
DOI:
10.1016/j.ydbio.2005.03.027
[Indexed for MEDLINE]
Free full text

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center