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A number of  Eucalyptus  species exhibit precocious flowering, flowering within a year of germination and often while still exhibiting juvenile foliage. To understand the nature of precocious flowering in  E  ucalyptus  occidentalis , partial homologues of the inflorescence meristem identity gene  TERMINAL  FLOWER1  and of the floral meristem identity genes  LEAFY  and  APETALA1  ( EOTFL1 ,  EOLFY  and  EOAP1 , respectively) were isolated and characterized. The expression patterns of these meristem identity genes during the development of branched and single-stem plants were analysed by quantitative reverse transcriptase PCR. All  E .  occidentalis  plants commenced flowering within 40 weeks of germination. However, the branched plants reached maximum flowering some 5–6 weeks earlier than did single-stem plants. Levels of  EOTFL1  and  EOLFY  expression varied little during the study period irrespective of architecture treatment, whereas expression of  EOAP1  reached a peak coincident with peak flowering in both branched and single-stem plants.  AP1  is clearly an expression marker for flowering in this species.

Quantitative expression analysis of meristem identity genes in Eucalyptus occidentalis : AP1 is an expression marker for flowering