Class D and B(sister) MADS-box genes are associated with ectopic ovule formation in the pistil-like stamens of alloplasmic wheat (Triticum aestivum L.)

Homeotic transformation of stamens into pistil-like structures (pistillody) has been reported in cytoplasmic substitution (alloplasmic) lines of bread wheat (Triticum aestivum L.) that have the cytoplasm of a related wild species, Aegilops crassa. An ectopic ovule differentiates in the pistil-like s...

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Published in:Plant molecular biology 2009-09, Vol.71 (1-2), p.1-14
Main Authors: Yamada, Kaori, Saraike, Tatsunori, Shitsukawa, Naoki, Hirabayashi, Chizuru, Takumi, Shigeo, Murai, Koji
Format: Article
Language:English
Subjects:
Actins - genetics
DNA Primers
Flowers - genetics
Flowers - growth & development
Flowers - physiology
Gene Expression Regulation, Plant
Genes, Plant
MADS Domain Proteins - genetics
Phylogeny
Plant Proteins - genetics
Pollen - physiology
Reverse Transcriptase Polymerase Chain Reaction
Seeds - physiology
Triticum - genetics
Triticum - growth & development
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Summary:Homeotic transformation of stamens into pistil-like structures (pistillody) has been reported in cytoplasmic substitution (alloplasmic) lines of bread wheat (Triticum aestivum L.) that have the cytoplasm of a related wild species, Aegilops crassa. An ectopic ovule differentiates in the pistil-like stamen in the alloplasmic wheat. The SEEDSTICK (STK)-like class D MADS-box gene, wheat STK (WSTK), was expressed in the primordia of ectopic ovules in the pistil-like stamens as well as in the true pistil, suggesting that ectopic ovule formation results from WSTK expression in the pistil-like stamens of alloplasmic wheat. The ectopic ovule is abnormal as it fails to form complete integuments. Based on the expression pattern of WSTK and B(sister) MADS-box gene, WBsis (wheat B ( sister )), we conclude that WSTK plays a role in determination of ovule identity in the pistil-like stamen, but complete ovule development fails due to aberrant expression of WBsis.
ISSN:1573-5028
DOI:10.1007/s11103-009-9504-z