Journal Article

The Leaf Index: Heteroblasty, Natural Variation, and the Genetic Control of Polar Processes of Leaf Expansion

Hirokazu Tsukaya

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 43, issue 4, pages 372-378
Published in print April 2002 | ISSN: 0032-0781
Published online April 2002 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcf051
The Leaf Index: Heteroblasty, Natural Variation, and the Genetic Control of Polar Processes of Leaf Expansion

More Like This

Show all results sharing these subjects:

  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

GO

Show Summary Details

Preview

The morphology of the leaves of angiosperms exhibits remarkable diversity. One of the factors showing the greatest variability is the leaf index, namely, the ratio of leaf length to leaf width. In some cases, different varieties of a single species or closely related species can be distinguished by differences in leaf index. To some extent, the leaf index reflects the morphological adaptation of leaves to a particular environment. Moreover, physiological conditions or environmental factors can change the leaf index of an individual plant. No good tools have been available for studies of the mechanisms that underlie such biodiversity. However, we have recently obtained some, albeit fragmentary, information about molecular mechanisms of leaf morphogenesis as a result of studies of leaves of the model plant, Arabidopsis thaliana (L.) Heynh. For example, the ANGUSTIFOLIA gene, a homolog of animal CtBP genes, controls leaf width. ANGUSTIFOLIA appears to regulate the polar elongation of leaf cells via control of the arrangement of cortical microtubules. By contrast, the ROTUNDIFOLIA3 gene controls leaf length via the biosynthesis of steroid(s). We provide here an overview of the biodiversity exhibited by the leaf index of angiosperms. In particular, we consider information obtained from studies of mutants and transgenic strains of A. thaliana, from the so-called Evo/devo perspective.

Keywords: Key words: ANGUSTIFOLIA — Arabidopsis — Evo/devo — Leaf index — Leaf morphogenesis — Microtubules — Morphogenesis — ROTUNDIFOLIA3.

Journal Article.  5013 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.