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Transcriptome analysis of bolting in A. tequilana reveals roles for florigen, MADS, fructans and gibberellins.
BMC Genomics 2019 June 11
BACKGROUND: Reliable indicators for the onset of flowering are not available for most perennial monocarpic species, representing a drawback for crops such as bamboo, agave and banana. The ability to predict and control the transition to the reproductive stage in A. tequilana would represent an advantage for field management of agaves for tequila production and for the development of a laboratory model for agave species.
RESULTS: Consistent morphological features could not be determined for the vegetative to reproductive transition in A. tequilana. However, changes in carbohydrate metabolism where sucrose decreased and fructans of higher degree of polymerization increased in leaves before and after the vegetative to reproductive transition were observed. At the molecular level, transcriptome analysis from leaf and shoot apical meristem tissue of A. tequilana plants from different developmental stages identified OASES as the most effective assembly program and revealed evidence for incomplete transcript processing in the highly redundant assembly obtained. Gene ontology analysis uncovered enrichment for terms associated with carbohydrate and hormone metabolism and detailed analysis of expression patterns for individual genes revealed roles for specific Flowering locus T (florigen), MADS box proteins, gibberellins and fructans in the transition to flowering.
CONCLUSIONS: Based on the data obtained, a preliminary model was developed to describe the regulatory mechanisms underlying the initiation of flowering in A. tequilana. Identification of specific promoter and repressor Flowering Locus T and MADS box genes facilitates functional analysis and the development of strategies to modulate the vegetative to reproductive transition in A. tequilana.
RESULTS: Consistent morphological features could not be determined for the vegetative to reproductive transition in A. tequilana. However, changes in carbohydrate metabolism where sucrose decreased and fructans of higher degree of polymerization increased in leaves before and after the vegetative to reproductive transition were observed. At the molecular level, transcriptome analysis from leaf and shoot apical meristem tissue of A. tequilana plants from different developmental stages identified OASES as the most effective assembly program and revealed evidence for incomplete transcript processing in the highly redundant assembly obtained. Gene ontology analysis uncovered enrichment for terms associated with carbohydrate and hormone metabolism and detailed analysis of expression patterns for individual genes revealed roles for specific Flowering locus T (florigen), MADS box proteins, gibberellins and fructans in the transition to flowering.
CONCLUSIONS: Based on the data obtained, a preliminary model was developed to describe the regulatory mechanisms underlying the initiation of flowering in A. tequilana. Identification of specific promoter and repressor Flowering Locus T and MADS box genes facilitates functional analysis and the development of strategies to modulate the vegetative to reproductive transition in A. tequilana.
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