Regulation of flowering time in Arabidopsis

 

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Flowering pathway

Gibberellin pathway

References

 

The Gibberellin transduction pathway

 

SNE (SNEEZY)

 

The sne mutants were isolated in a screen for suppressors of the sly1-10 loss-of-function phenotype (Strader et al., 2004). Germination rates, fertility and plant height are complemented in these plants. However, this  publication does not mention the effect of the sne mutation on flowering time.

SNE is a highly conserved gene in plants. It is 471 bp long and encodes for a predicted polypeptide of 157 amino-acids.

SNE transcript levels are high in the stems and flowers, and low in the seedlings, leaves and green siliques.

SNE stimulates RGA degradation:

In the complete absence of SLY1 (plants expressing antisens SLY1 transcripts), the plants have a wild-type phenotype. The expression of SNE is unaffected in these plants.

The sne mutant phenotype is actually caused by over-expression of SNE. Plants over-expressing SNE under the control of the 35S promoter also show complementation of the sly1-2 or sly1-10 loss-of-function mutant phenotypes, and contain very low levels of RGA protein. This means that SNE can functionally complement SLY1 as a negative regulator of RGA (Strader et al., 2004).