FT Protein Movement Contributes to Long-Distance Signaling in Floral Induction of
            <i>Arabidopsis</i>

Corbesier, Laurent; Vincent, Coral; Jang, Seonghoe; Fornara, Fabio; Fan, Qingzhi; Searle, Iain; Giakountis, Antonis; Farrona, Sara; Gissot, Lionel; Turnbull, Colin; Coupland, George

doi:10.1126/science.1141752

Cited by 1,900 publications

(1,711 citation statements)

References 30 publications

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“…Há muito tempo, acredita-se na existência de um suposto florígeno como sendo o responsável pelo sinal de florescimento das plantas. Atualmente, há fortes evidências de que um dos componentes do florígeno seja a proteína do gene FLOWERING LOCUS T (FT) de Arabidopsis thaliana, o qual é capaz de se translocar no floema e induzir o florescimento (CORBESIER et al, 2007;TAMAKI et al, 2007). O ortólogo de FT em tomateiro é o gene que corresponde à mutação single flower truss (sft).…”

Section: Hábito De Crescimento E Sinal Para O Florescimentounclassified

Base genética do hábito de crescimento e florescimento em tomateiro e sua importância na agricultura

Piotto

Peres

2012

Cienc. Rural

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Section: Hábito De Crescimento E Sinal Para O Florescimentounclassified

Base genética do hábito de crescimento e florescimento em tomateiro e sua importância na agricultura

Piotto

Peres

2012

Cienc. Rural

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“…The gibberellin (GA) pathway plays a relatively independent role in floral transition under noninductive photoperiods (Araki, 2001). Among these pathways, the photoperiod pathway is largely dependent on phloem activity, since the signals induced by photoperiod, CONSTANS and its downstream target FLOWERING LOCUS T (FT) are expressed in the vasculature and the mobile flowering signal FT needs to be transported through the phloem to the meristem (Corbesier et al, 2007;Mathieu et al, 2007). The floral transition times of nakr1-1 and Col-0 were measured under different floral promotion conditions.…”

Section: Nakr1-1 Is a Late-flowering Mutant Especially In Long-day Comentioning

confidence: 99%

Arabidopsis NPCC6/NaKR1 Is a Phloem Mobile Metal Binding Protein Necessary for Phloem Function and Root Meristem Maintenance

et al. 2010

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SODIUM POTASSIUM ROOT DEFECTIVE1 (NaKR1; previously called NPCC6) encodes a soluble metal binding protein that is specifically expressed in companion cells of the phloem. The nakr1-1 mutant phenotype includes high Na + , K + , Rb + , and starch accumulation in leaves, short roots, late flowering, and decreased long-distance transport of sucrose. Using traditional and DNA microarray-based deletion mapping, a 7-bp deletion was found in an exon of NaKR1 that introduced a premature stop codon. The mutant phenotypes were complemented by transformation with the native gene or NaKR1-GFP (green fluorescent protein) and NaKR1-b-glucuronidase fusions driven by the native promoter. NAKR1-GFP was mobile in the phloem; it moved from companion cells into sieve elements and into a previously undiscovered symplasmic domain in the root meristem. Grafting experiments revealed that the high Na + accumulation was due mainly to loss of NaKR1 function in the leaves. This supports a role for the phloem in recirculating Na + to the roots to limit Na + accumulation in leaves. The onset of root phenotypes coincided with NaKR1 expression after germination. The nakr1-1 short root phenotype was due primarily to a decreased cell division rate in the root meristem, indicating a role in root meristem maintenance for NaKR1 expression in the phloem.

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“…After perceiving flowering-inducing long days, the key regulator of the photoperiodic pathway, CONSTANS (CO), activates FT (FLOWERING LOCUS T) in the leaf vasculature. The FT protein is transported to apical meristems, where it triggers the floral transition 5 . SOC1 (AGL20) and FUL (AGL8) are MADS box genes acting downstream of FT in apical meristems, but they are already expressed in leaves-independently of FT-during the vegetative phase.…”

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Flowering-time genes modulate meristem determinacy and growth form in Arabidopsis thaliana

et al. 2008

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Plants have evolved annual and perennial life forms as alternative strategies to adapt reproduction and survival to environmental constraints. In isolated situations, such as islands, woody perennials have evolved repeatedly from annual ancestors 1 . Although the molecular basis of the rapid evolution of insular woodiness is unknown, the molecular difference between perennials and annuals might be rather small, and a change between these life strategies might not require major genetic innovations 2,3 . Developmental regulators can strongly affect evolutionary variation 4 and genes involved in meristem transitions are good candidates for a switch in growth habit. We found that the MADS box proteins SUPPRESSOR OF OVEREXPRESSION OF CONSTANS 1 (SOC1) and FRUITFULL (FUL) not only control flowering time, but also affect determinacy of all meristems. In addition, downregulation of both proteins established phenotypes common to the lifestyle of perennial plants, suggesting their involvement in the prevention of secondary growth and longevity in annual life forms.Plant growth originates from a small number of undifferentiated cells called meristems. Primary meristems are established during embryogenesis and form primary tissues from which all plant organs develop. Secondary meristems, such as axillary meristems and the cambium, originate within primary tissues. Meristems can be determinate-that is, consumed for the formation of an organ-or indeterminate, meaning that they are active throughout the life span of a plant. Upon floral induction in annual plants, vegetative shoot meristems undergo the transition to inflorescence meristems. These inflorescence meristems will remain indeterminate for some time to generate determinate floral meristems giving rise to flowers. Finally, all meristems are consumed and the plants die in the same growing season. In contrast, perennial plants have evolved more elaborate life strategies to survive harsh environmental conditions for many years by forming perennial structures such as overwintering buds, bulbs or tubers, which contain at least one indeterminate meristem for the outgrowth in the next season 2 . Often, perennial plants incorporate enormous amounts of long-lived and eventually dead biomass (wood) through cambial activity (secondary growth).Arabidopsis thaliana is a small annual herb in which floral induction is controlled by different flowering-time pathways. These pathways depend on environmental cues, such as day length (photoperiod) and vernalization (cold temperature), or on plant age. Arabidopsis is a facultative long-day plant that flowers much faster under long (16 h/day) than short (8 h/day) light periods. After perceiving flowering-inducing long days, the key regulator of the photoperiodic pathway, CONSTANS (CO), activates FT (FLOWERING LOCUS T) in the leaf vasculature. The FT protein is transported to apical meristems, where it triggers the floral transition 5 . SOC1 (AGL20) and FUL (AGL8) are MADS box genes acting downstream of FT in apical meristems, but they are ...

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FT Protein Movement Contributes to Long-Distance Signaling in Floral Induction of Arabidopsis

Cited by 1,900 publications

References 30 publications

Base genética do hábito de crescimento e florescimento em tomateiro e sua importância na agricultura

Base genética do hábito de crescimento e florescimento em tomateiro e sua importância na agricultura

Arabidopsis NPCC6/NaKR1 Is a Phloem Mobile Metal Binding Protein Necessary for Phloem Function and Root Meristem Maintenance

Flowering-time genes modulate meristem determinacy and growth form in Arabidopsis thaliana

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