Recommended Conferences

Genetic Engineering and Gene Therapy

Paris, France

Human Genetics and Genetic Disorders

Miami, USA

Tissue Engineering and Regenerative Medicine

Chicago, USA
Related Subjects
 

UFO in the Arabidopsis inflorescence apex is required for floral-meristem identity and bract suppression

Author(s): Hepworth SR, Klenz JE, Haughn GW

Abstract

The UNUSUAL FLORAL ORGANS (UFO) gene of Arabidopsis encodes an F-box protein required for the determination of floral-organ and floral-meristem identity. Mutation of UFO leads to dramatic changes in floral-organ type which are well-characterized whereas inflorescence defects are more subtle and less understood. These defects include an increase in the number of secondary inflorescences, nodes that alternate between forming flowers and secondary inflorescences, and nodes in which a single flower is subtended by a bract. Here, we show how inflorescence defects correlate with the abnormal development of floral primordia and establish a temporal requirement for UFO in this process. At the inflorescence apex of ufo mutants, newly formed primordia are initially bract-like. Expression of the floral-meristem identity genes LFY and AP1 are confined to a relatively small adaxial region of these primordia with expression of the bract-identity marker FIL observed in cells that comprise the balance of the primordia. Proliferation of cells in the adaxial region of these early primordia is delayed by several nodes such that primordia appear “chimeric” at several nodes, having visible floral and bract components. However, by late stage 2 of floral development, growth of the bract generally ceases and is overtaken by development of the floral primordium. This abnormal pattern of floral meristem development is not rescued by expression of UFO from the AP1 promoter, indicating that UFO is required prior to AP1 activation for normal development of floral primordia. We propose that UFO and LFY are jointly required in the inflorescence meristem to both promote floral meristem development and inhibit, in a non-cell autonomous manner, growth of the bract.

Similar Articles

Effect of climatic factors on powdery mildew caused by Sphaerotheca macularis f

Author(s): Amsalem L, Freeman S, Rav-David D, Nitzani Y, Sztejnberg A, et al.

Biotechnological concepts for improving plant innate immunity

Author(s): Gust AA, Brunner F, Nurnberger T

The genome of woodland strawberry (Fragaria vesca)

Author(s): Shulaev V, Sargent DJ, Crowhurst RN, Mockler TC, Folkerts O, et al.

An inbred line of the diploid strawberry Fragaria vesca f

Author(s): Slovin JP, Schmitt K, Folta KM

Cytochromes P450 for engineering herbicide tolerance

Author(s): Werck-Reichhart D, Hehn A, Didierjean L

The barley/Blumeria (syn

Author(s): Thordal-Christensen H, Gregersen PL, Collinge DB

The HvNAC6 transcription factor: a positive regulator of penetration resistance in barley and Arabidopsis

Author(s): Jensen MK, Rung JH, Gregersen PL, Gjetting T, Fuglsang AT, et al.