[Lisfauba] AVISO seminario EXTRAORDINARIO IFEVA - miércoles 19 de octubre de 2022.

[Facultad de Agronomía UBA]

* Seminario IFEVA*
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*MIERCOLES19 de Octubre** 2022*

*12.00 hs*


Virtual: *YouTube* Canal *IFEVA*
<https://www.youtube.com/channel/UCCC_QmqL9yuKBnZ6p4mnxBw>

Presencial: S.U.M. *IFEVA*
*Photoperiodic regulation of wheat heading time*.

Autores: Maria Alejandra Alvarez, Chengxia Li, Huiqiong Lin, Anna Joe,
Daniel Woods y *Jorge Dubcovsky(*)*

*(*)* expositor

*Filiación: *University of California Davis / Howard Hughes Medical
Institute

*Resumen: *The photoperiodic response is critical for plants to adjust
their reproductive phase to the most favorable season. Wheat heads earlier
under long days (LD) than under short days (SD) and this difference is
mainly regulated by the PHOTOPERIOD1 (PPD1) gene. Tetraploid wheat plants
carrying the Ppd-A1a allele with a large deletion in the promoter head
earlier under SD than plants carrying the wildtype Ppd-A1b allele with an
intact promoter. Phytochromes PHYB and PHYC are necessary for the light
activation of PPD1, and mutations in either of these genes result in the
downregulation of PPD1 and very late heading time. We show here that both
effects are reverted when the phyB mutant is combined with loss-of-function
mutations in EARLY FLOWERING 3 (ELF3), a component of the Evening Complex
(EC) in the circadian clock. We also show that the wheat ELF3 protein
interacts with PHYB and PHYC, is rapidly modified by light, and binds to
the PPD1 promoter in planta (likely as part of the EC). Deletion of the
ELF3 binding region in the Ppd-A1a promoter results in its upregulation at
dawn, similar to PPD1 alleles with intact promoters in the elf3 mutant
background. The upregulation of PPD1 is correlated with the upregulation of
the florigen gene FLOWERING LOCUS T1 (FT1) and early heading time.
Loss-of-function mutations in ppd1 result in the downregulation of FT1 and
delayed heading, even when combined with the elf3 mutation. Taken together,
these results indicate that ELF3 operates downstream of PHYB as a direct
transcriptional repressor of PPD1, and that this repression is relaxed both
by light and by the deletion of the ELF3 binding region in
the Ppd-A1a promoter. In summary, the regulation of the light mediated
activation of PPD1 by ELF3 is critical for the photoperiodic regulation of
wheat heading time.

*Palabras claves: *Early flowering, Photoperiod, Wheat

[image: 2013 Dubcovsky UCD NAS Award 2.jpg]

*El Dr. Jorge Dubcovsky *es Profesor Distinguido en la Universidad de
California, Davis, USA, investigador del Howard Hughes Medical Institute y
miembro de la Academia de Ciencias de USA. Recibió el premio internacional
de Agricultura (“Wolf Prize”) in 2014. El Dr. Dubcovsky ha publicado más de
300 estudios en revistas científicas, que han sido citadas más de 40,000
veces (h= 107), ha liberado 28 cultivares y 72 germoplasmas mejorados, y ha
entrenado 29 estudiantes de PhD y 9 de Master. Su laboratorio se enfoca en
identificar, entender y utilizar genes de trigo relevantes para el
mejoramiento. Su grupo ha desarrollado numerosas herramientas genómicas
para acelerar estos descubrimientos, incluidas una colección de mutantes de
trigo que incluye 15,000,000 de mutaciones secuenciadas en todos los genes
de trigo y sus promotores. El laboratorio del Dr Dubcovsky ha utilizado
estas herramientas pare desarrollar variedades de floración temprana y para
incrementar el rendimiento y el contenido de proteína y fibra en el grano
de trigo.

*Certificados:* los alumnos que necesiten certificar su asistencia, deberán
enviar su nombre y DNI al moderador (mtexeira en agro.uba.ar) durante el
transcurso del seminario o en la hora posterior a la finalización del mismo
.

*Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la
Agricultura*


IFEVA - Facultad de Agronomía - Universidad de Buenos Aires
 Av. San Martín 4453 - C1417DSE - Buenos Aires - Argentina
-- 
Marcos Texeira
Departamento de Métodos Cuantitativos y Sistemas de Información //
LART - IFEVA - CONICET
(011) 452870829
Facultad de Agronomía
Universidad de Buenos Aires
Av. San Martín 4453 (C1417DSE)
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