Plant Physiology Preview
Published on August 18, 2006; 10.1104/pp.106.082289
Received April 18, 2006
Accepted July 28, 2006
Gibberllin Mobilizes Distinct DELLA-dependent Transcriptomes to Regulate Seed Germination and Floral Development in Arabidopsis
Dongni Cao , Hui Cheng , Wei Wu , Hui Meng Soo , and Jinrong Peng *
Functional Genomics Laboratory, Institute of Molecular and Cell Biology, 61 Biopolis Drive, Proteos, Singapore 138673
* Corresponding author; email: pengjr{at}imcb.a-star.edu.sg.
Severe Arabidopsis GA-deficient mutant ga1-3 fails to germinate and is impaired in floral organ development. In contrast, the ga1-3 gai-t6 rga-t2 rgl1-1 rgl2-1 mutant confers GA-independent seed germination and floral development. This fact suggests that GA-regulated transcriptomes for seed germination and floral development are DELLA-dependent. However, it is currently not known 1) if all GA-regulated genes are GA-regulated in a DELLA-dependent fashion and 2) if a similar set of DELLA-regulated genes are mobilized to repress both seed germination and floral development. Here we compared the global gene expression patterns in the imbibed seeds and unopened flower buds of the ga1-3 mutant with that of the wild type and of the ga1-3 gai-t6 rga-t2 rgl1-1 rgl2-1 mutant. We found that about a half of total GA-regulated genes are apparently regulated in a DELLA-dependent fashion, suggesting that there might be a DELLA-independent or -partially-dependent component of GA-dependent gene regulation. Cross-comparison based on gene identity revealed that the GA-regulated DELLA-dependent transcriptomes in the imbibed seeds and flower buds are distinct from each other. Detailed ontology analysis showed that, on one hand, DELLAs differentially regulate the expression of different individual members of a gene family to run similar biochemical pathways in seeds and flower, meanwhile DELLAs control many functionally different genes to run specific pathways in seeds or flower buds to mark the two different developmental processes. Our data shown here not only confirms many previous reports but also singles out some novel aspects of DELLA functions that are instructive to our future research.
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