XAANTAL1 Reveals an Additional Level of Flowering Regulation in the Shoot Apical Meristem in Response to Light and Increased Temperature in Arabidopsis
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Published:2023-08-14
Issue:16
Volume:24
Page:12773
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ISSN:1422-0067
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Container-title:International Journal of Molecular Sciences
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language:en
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Short-container-title:IJMS
Author:
Rodríguez-Bolaños Mónica1, Martínez Tania1, Juárez Saray1, Quiroz Stella12, Domínguez Andrea1, Garay-Arroyo Adriana1, Sanchez María de la Paz1ORCID, Álvarez-Buylla Elena R.1, García-Ponce Berenice1ORCID
Affiliation:
1. Instituto de Ecologίa, Departamento de Ecologίa Funcional, Universidad Nacional Autónoma de México, Circuito ext. s/no. Ciudad Universitaria, Coyoacán 04510, CDMX, Mexico 2. Laboratory of Pathogens and Host Immunity, University of Montpellier, 34 090 Montpellier, France
Abstract
Light and photoperiod are environmental signals that regulate flowering transition. In plants like Arabidopsis thaliana, this regulation relies on CONSTANS, a transcription factor that is negatively posttranslational regulated by phytochrome B during the morning, while it is stabilized by PHYA and cryptochromes 1/2 at the end of daylight hours. CO induces the expression of FT, whose protein travels from the leaves to the apical meristem, where it binds to FD to regulate some flowering genes. Although PHYB delays flowering, we show that light and PHYB positively regulate XAANTAL1 and other flowering genes in the shoot apices. Also, the genetic data indicate that XAL1 and FD participate in the same signaling pathway in flowering promotion when plants are grown under a long-day photoperiod at 22 °C. By contrast, XAL1 functions independently of FD or PIF4 to induce flowering at higher temperatures (27 °C), even under long days. Furthermore, XAL1 directly binds to FD, SOC1, LFY, and AP1 promoters. Our findings lead us to propose that light and temperature influence the floral network at the meristem level in a partially independent way of the signaling generated from the leaves.
Funder
UNAM-DGAPA-PAPIIT CONAHCyT
Subject
Inorganic Chemistry,Organic Chemistry,Physical and Theoretical Chemistry,Computer Science Applications,Spectroscopy,Molecular Biology,General Medicine,Catalysis
Reference82 articles.
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