Establishment of a patterned GAL4-VP16 transactivation system for discovering gene function in rice
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Dacheng Liang(1), Changyin Wu(1), Caishun Li(1), Caiguo Xu(1), Jianwei Zhang(1), Andrzej Kilian(2), Xianghua Li(1), Qifa Zhang(1) and Lizhong Xiong(1,*)
The Plant Journal
Volume 46 Page 1059 - June 2006
Volume 46 Issue 6
Received 23 October 2005; revised 8 February 2006; accepted 28 February 2006.
A binary GAL4-VP16UAS transactivation system has been established in rice (Oryza sativa
L.) in this study for the discovery of gene functions. This binary system consists of two types of transgenic lines, pattern lines and target lines. The pattern lines were produced by transformation of Zhonghua 11, a japonica cultivar, with a construct consisting of the transactivator gene GAL4-VP16
controlled by a minimal promoter and the GUSplus reporter controlled by the upstream activation sequence (UAS; cis
-element to GAL4). Target lines were generated by transformation of Zhonghua 11 with constructs carrying the EGFP reporter and target genes of interest, both controlled by the UAS but in opposite directions. Hybrid plants were obtained by crossing target lines of 10 putative transcription factor genes from rice with six pattern lines showing expression in anther, stigma, palea, lemma and leaves. The EGFP and target genes perfectly co-expressed in hybrid plants with the same expression patterns as in the pattern lines. Various phenotypic changes, such as delayed flowering, multiple pistils, dwarfism, narrow and droopy leaves, reduced tillers, growth retardation and sterility, were induced as a result of the expression of the target genes. It is concluded that this transactivation system can provide a useful tool in rice to unveil latent functions of unknown or known genes.