Independent and interactive effects of DOF affecting germination 1 (DAG1) and the Della proteins GA insensitive (GAI) and Repressor of ga1-3 (RGA) in embryo development and seed germination
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- 作者：Alessandra Boccaccini (1)
Silvia Santopolo (1)
Davide Capauto (1)
Riccardo Lorrai (1)
Emanuele Minutello (1)
Katia Belcram (2)
Jean-Cristophe Palauqui (2)
Paolo Costantino (1)
Paola Vittorioso (1) (3)
1. Istituto Pasteur Fondazione Cenci Bolognetti ; Dipartimento di Biologia e Biotecnologie 鈥淐. Darwin鈥? Sapienza Universit脿 di Roma ; Piazzale Aldo Moro 5 ; 00185 ; Rome ; Italy
2. Institut Jean-Pierre Bourgin ; UMR1318 INRA-AgroParisTech ; B芒timent 2 ; INRA ; Centre de Versailles-Grignon ; Route de St-Cyr (RD10) ; 78026 ; Versailles Cedex ; France
3. Dipartimento di Biologia e Biotecnologie 鈥淐. Darwin鈥? Sapienza Universit脿 di Roma ; Piazzale Aldo Moro 5 ; 00185 ; Rome ; Italy - 关键词：DAG1 ; GAI ; RGA ; Seed germination ; Embryogenesis ; Arabidopsis thaliana
- 刊名：BMC Plant Biology
- 出版年：2014
- 出版时间：December 2014
- 年：2014
- 卷：14
- 期：1
- 全文大小：2,141 KB
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- 出版者：BioMed Central
- ISSN：1471-2229
文摘
Background The transcription factor DOF AFFECTING GERMINATION1 (DAG1) is a repressor of seed germination acting downstream of the master repressor PHYTOCROME INTERACTING FACTOR3-LIKE 5 (PIL5). Among others, PIL5 induces the expression of the genes encoding the two DELLA proteins GA INSENSITIVE 1 (GAI) and REPRESSOR OF ga1-3 (RGA). Results Based on the properties of gai-t6 and rga28 mutant seeds, we show here that the absence of RGA severely increases dormancy, while lack of GAI only partially compensates RGA inactivation. In addition, the germination properties of the dag1rga28 double mutant are different from those of the dag1 and rga28 single mutants, suggesting that RGA and DAG1 act in independent branches of the PIL5-controlled germination pathway. Surprisingly, the dag1gai-t6 double mutant proved embryo-lethal, suggesting an unexpected involvement of (a possible complex between) DAG1 and GAI in embryo development. Conclusions Rather than overlapping functions as previously suggested, we show that RGA and GAI play distinct roles in seed germination, and that GAI interacts with DAG1 in embryo development.