Isolation and Characterization of a Putative Class E Gene from Taihangia rupestris

Studies in model plants showed that SEPALLATA(SEP) genes are required for the identification of floral organs and the determination of floral meristems in Arabidopsis. In this paper a SEP homolog, TrSEP3, was isolated from a China‐specific species, Taihangia rupestrisi Yü et Li. Phylogenetic analysi...

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Bibliographic Details
Published in:Journal of integrative plant biology 2007-03, Vol.49 (3), p.343-350
Main Authors: Wang, Yong-Qiang, Tian, Hui-Yu, Du, Xiao-Qiu, Lü, Shan-Hua, Lu, Wen-Liang, Chong, Kang, Meng, Zheng
Format: Article
Language:English
Subjects:
class E gene
MADS-box
selection pressure
Taihangia rupestris
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Summary:Studies in model plants showed that SEPALLATA(SEP) genes are required for the identification of floral organs and the determination of floral meristems in Arabidopsis. In this paper a SEP homolog, TrSEP3, was isolated from a China‐specific species, Taihangia rupestrisi Yü et Li. Phylogenetic analysis showed that the gene belongs to the SEP3‐clade of SEP (previous AGL2) subfamily. In situ hybridization was used to reveal the potential functional specification, and the results showed that TrSEP3 expression was first observed in floral meristems and then confined to the floral primordia of the three inner whorls. In the matured flower, TrSEP3 was strongly expressed in the tips of pistils and weak in stamens and petals. The evolution force analysis shows that TrSEP3 might undergo a relaxed negative selection. These results suggested that TrSEP3 may not only function in determining the identity of floral meristems and the primordia of three inner whorls, but also function in matured reproductive organs.
ISSN:1672-9072
1744-7909
DOI:10.1111/j.1744-7909.2007.00431.x