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Plants 2013, 2(3), 379-395; doi:10.3390/plants2030379
Review

Homeotic Genes and the ABCDE Model for Floral Organ Formation in Wheat

Received: 19 April 2013; in revised form: 2 June 2013 / Accepted: 18 June 2013 / Published: 25 June 2013
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Abstract: Floral organ formation has been the subject of intensive study for over 20 years, particularly in the model dicot species Arabidopsis thaliana. These studies have led to the establishment of a general model for the development of floral organs in higher plants, the so-called ABCDE model, in which floral whorl-specific combinations of class A, B, C, D, or E genes specify floral organ identity. In Arabidopsis, class A, B, C, D, E genes encode MADS-box transcription factors except for the class A gene APETALA2. Mutation of these genes induces floral organ homeosis. In this review, I focus on the roles of these homeotic genes in bread wheat (Triticum aestivum), particularly with respect to the ABCDE model. Pistillody, the homeotic transformation of stamens into pistil-like structures, occurs in cytoplasmic substitution (alloplasmic) wheat lines that have the cytoplasm of the related wild species Aegilops crassa. This phenomenon is a valuable tool for analysis of the wheat ABCDE model. Using an alloplasmic line, the wheat ortholog of DROOPING LEAF (TaDL), a member of the YABBY gene family, has been shown to regulate pistil specification. Here, I describe the current understanding of the ABCDE model for floral organ formation in wheat.
Keywords: ABCDE model; floral organ; homeotic gene; MADS-box gene; pistillody; wheat ABCDE model; floral organ; homeotic gene; MADS-box gene; pistillody; wheat
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Murai, K. Homeotic Genes and the ABCDE Model for Floral Organ Formation in Wheat. Plants 2013, 2, 379-395.

AMA Style

Murai K. Homeotic Genes and the ABCDE Model for Floral Organ Formation in Wheat. Plants. 2013; 2(3):379-395.

Chicago/Turabian Style

Murai, Koji. 2013. "Homeotic Genes and the ABCDE Model for Floral Organ Formation in Wheat." Plants 2, no. 3: 379-395.


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