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AGO1 controls arabidopsis inflorescence architecture possibly by regulating TFL1 expression

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† Background and Aims The TERMINAL FLOWER 1 (TFL1) gene is pivotal in the control of inflorescence
architecture in arabidopsis. Thus, tfl1 mutants flower early and have a very short inflorescence phase, while
TFL1-overexpressing plants have extended vegetative and inflorescence phases, producing many coflorescences.
TFL1 is expressed in the shoot meristems, never in the flowers. In the inflorescence apex, TFL1 keeps the floral genes LEAFY (LFY) and APETALA1 (AP1) restricted to the flower, while LFY and AP1 restrict TFL1 to the inflorescence meristem. In spite of the central role of TFL1 in inflorescence architecture, regulation of its expression is poorly understood. This study aims to expand the understanding of inflorescence development by identifying and studying novel TFL1 regulators.

† Methods Mutagenesis of an Arabidopsis thaliana line carrying a TFL1::GUS (b-glucuronidase) reporter construct was used to isolate a mutant with altered TFL1 expression. The mutated gene was identified by positional cloning. Expression of TFL1 and TFL1::GUS was analysed by real-time PCR and histochemical GUS detection. Doublemutant analysis was used to assess the contribution of TFL1 to the inflorescence mutant phenotype.

† KeyResultsAmutant with both an increased number of coflorescences and high and ectopic TFL1 expressionwas
isolated. Cloning of the mutated gene showed that both phenotypeswere caused by a mutation in the ARGONAUTE1
(AGO1) gene, which encodes a key component of theRNAsilencingmachinery. Analysis of anotherago1 allele indicated that the proliferation of coflorescences and ectopic TFL1 expression phenotypes are not allele specific. The increased number of coflorescences is suppressed in ago1 tfl1 double mutants.

†Conclusions The results identify AGO1 as a repressor of TFL1 expression. Moreover, they reveal a novel role for AGO1 in inflorescence development, controlling the production of coflorescences. AGO1 seems to play this role through regulating TFL1 expression.

Key words: Flower development, TERMINAL FLOWER 1, TFL1, ARGONAUTE1, AGO1, plant architecture, inflorescence architecture, flowering, Arabidopsis thaliana.

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Informasi Detail

Judul Seri

Annals of Botany

No. Panggil

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Penerbit

Oxford : Oxford University Press on behalf of the Annals of Botany Company., 2014

Deskripsi Fisik

Annals of Botany 114: 1471–1481, 2014

Bahasa

English

ISBN/ISSN

doi:10.1093/aob/mcu1

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

114: 2014

Subjek

BIOLOGI
BOTANI

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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