Induction of leaves directly from leaves in the maize mutant Lax midrib1-O

Developmental Biology
D SchichnesM Freeling

Abstract

One of the several phenes specified by the maize dominant mutation Lax midrib1-O (Lxm1-O on 3L) is the proliferation of leaf "flaps" usually paired around veins on the abaxial leaf surface. Using histology and scanning electron microscopy, we show these flaps to be authentic leaf structures; in rare instances, complete ectopic leaves are found. The first divisions preceding flap emergence occur between plastochrons 4 and 7, stages when the course of leaf differentiation is well under way. No sign of meristem or any small, densely cytoplasmic primordium-like cells were seen at the sites of flap initiation. In addition, the sites of ectopic leaf initiation do not express KNOX (Knotted-like homeobox) proteins, a molecular marker for shoot apical meristem cell identity. Thus, the cells that proliferate into ectopic leaves do not arise from a meristem or a primordium. A similar phenomenon has been described in several dicots, but in no other monocots. The details of flap morphology compared to the morphology of the leaf proper suggest a model whereby cells in regions of the leaf proper maintain the competence they acquired in the meristem. These cells then respond properly, in a regulated manner, to a delayed signal emanating from v...Continue Reading

References

Sep 1, 1992·Developmental Biology·M Freeling
Apr 1, 1992·BioEssays : News and Reviews in Molecular, Cellular and Developmental Biology·M FreelingN Sinha
Jan 1, 1969·Journal of Ultrastructure Research·A R Spurr
Jan 1, 1994·Genetics·P W Becraft, M Freeling
Oct 30, 1995·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·S HakeD Jackson
Sep 1, 1992·The Plant Cell·L. G. Smith, S. Hake

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Citations

Feb 13, 2001·Current Opinion in Plant Biology·M ByrneR Martienssen
Mar 6, 1999·Current Opinion in Plant Biology·M Tsiantis, J A Langdale
Feb 27, 1999·Current Opinion in Plant Biology·A Hudson
Jul 14, 2010·The New Phytologist·C A Kidner, S Wrigley
Apr 11, 2015·Frontiers in Plant Science·Antony M Chettoor, Matthew M S Evans
Jan 12, 1999·Developmental Biology·H CandelaJ L Micol
Jul 2, 2004·Development·John F GolzAndrew Hudson

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