Orchestration of Floral Initiation by APETALA1

Kaufmann, Kerstin; Wellmer, Frank; Muiño, Jose M.; Ferrier, Thilia; Wuest, Samuel E.; Kumar, Vijaya B.; Serrano-Mislata, Antonio; Madueño, Francisco; Krajewski, Paweł; Meyerowitz, Elliot M.; Angenent, Gerco C.; Riechmann, José Luis

doi:10.1126/science.1185244

Cited by 456 publications

(549 citation statements)

References 28 publications

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“…However, AP1 and LFY downregulate TFL1 in the flanks of the inflorescence meristem to specify floral meristems (Liljegren et al, 1999;Ratcliffe et al, 1999). AP1 binds to the MADS box element downstream of the TFL1 coding sequence (Kaufmann et al, 2010), and a recent report showed that SOC1 is involved in the AP1-dependent regulation of TFL1 homologs in both Arabidopsis and rice . Our time-course gene expression analysis suggests that at least initial downregulation of Fv TFL1 in the shoot apex of SD strawberry does not depend on the activation of floral meristem identity genes.…”

Section: Discussionmentioning

confidence: 99%

TheFragaria vescaHomolog of SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 Represses Flowering and Promotes Vegetative Growth

et al. 2013

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In the annual long-day plant Arabidopsis thaliana, SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 (SOC1) integrates endogenous and environmental signals to promote flowering. We analyzed the function and regulation of the SOC1 homolog (Fragaria vesca [Fv] SOC1) in the perennial short-day plant woodland strawberry (Fragaria vesca). We found that Fv SOC1 overexpression represses flower initiation under inductive short days, whereas its silencing causes continuous flowering in both short days and noninductive long days, similar to mutants in the floral repressor Fv TERMINAL FLOWER1 (Fv TFL1). Molecular analysis of these transgenic lines revealed that Fv SOC1 activates Fv TFL1 in the shoot apex, leading to the repression of flowering in strawberry. In parallel, Fv SOC1 regulates the differentiation of axillary buds to runners or axillary leaf rosettes, probably through the activation of gibberellin biosynthetic genes. We also demonstrated that Fv SOC1 is regulated by photoperiod and Fv FLOWERING LOCUS T1, suggesting that it plays a central role in the photoperiodic control of both generative and vegetative growth in strawberry. In conclusion, we propose that Fv SOC1 is a signaling hub that regulates yearly cycles of vegetative and generative development through separate genetic pathways.

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Section: Discussionmentioning

confidence: 99%

TheFragaria vescaHomolog of SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 Represses Flowering and Promotes Vegetative Growth

et al. 2013

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“…Recently, regulatory networks underlying important developmental processes such as flowering time and floral patterning have been elucidated in Arabidopsis (Kaufmann et al 2009(Kaufmann et al , 2010Pastore et al 2011;Winter et al 2011). Although these programs are largely conserved across eudicots, we know little about how such mechanisms extend to grasses and/or to what extent novel factors have been recruited to pattern grass-specific inflorescence morphology.…”

Section: [Supplemental Materials Is Available For This Article]mentioning

confidence: 99%

Regulatory modules controlling maize inflorescence architecture

et al. 2013

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Genetic control of branching is a primary determinant of yield, regulating seed number and harvesting ability, yet little is known about the molecular networks that shape grain-bearing inflorescences of cereal crops. Here, we used the maize (Zea mays) inflorescence to investigate gene networks that modulate determinacy, specifically the decision to allow branch growth. We characterized developmental transitions by associating spatiotemporal expression profiles with morphological changes resulting from genetic perturbations that disrupt steps in a pathway controlling branching. Developmental dynamics of genes targeted in vivo by the transcription factor RAMOSA1, a key regulator of determinacy, revealed potential mechanisms for repressing branches in distinct stem cell populations, including interactions with KNOTTED1, a master regulator of stem cell maintenance. Our results uncover discrete developmental modules that function in determining grass-specific morphology and provide a basis for targeted crop improvement and translation to other cereal crops with comparable inflorescence architectures.

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“…In addition to the described binding by BZR1 , BRs might also target PIF5 through direct binding by BES1 . Intriguingly, several transcription factors involved in the regulation of flowering (AP1, SVP, LFY, AG, and SEP3) have also been identified to bind PIFs (Kaufmann et al, 2009(Kaufmann et al, , 2010Moyroud et al, 2011;Tao et al, 2012;Gregis et al, 2013;ÓMaoiléidigh et al, 2013), suggesting a direct link to the reported flowering phenotype of pif mutants (Brock et al, 2010;Nozue et al, 2011;Kumar et al, 2012). Finally, binding by REV and AGL15 (Zheng et al, 2009;Brandt et al, 2012) suggests that some of the PIFs might be involved in leaf patterning or embryogenesis, a possibility that needs to be explored.…”

Section: Transcriptional Regulation Of the Pifsmentioning

confidence: 99%