Ehd1, a B-type response regulator in rice, confers short-day promotion of flowering and controls FT-like gene expression independently of Hd1.

By K. Doi, T. Izawa, T. Fuse, Utako Yamanouchi, T. Kubo, Zenpei Shimatani, Masahiro Yano, A. Yoshimura. Genes & Development, 2004

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Two evolutionarily distant plant species, rice (Oryza sativa L.), a short-day (SD) plant, and Arabidopsis thaliana, a long-day plant, share a conserved genetic network controlling photoperiodic flowering. The orthologous floral regulators-rice Heading date 1 (Hd1) and Arabidopsis CONSTANS (CO)-integrate circadian clock and external light signals into mRNA expression of the FLOWERING LOCUS T (FT) group floral inducer. Here, we report that the rice Early heading date 1 (Ehd1) gene, which confers SD promotion of flowering in the absence of a functional allele of Hd1, encodes a B-type response regulator that might not have an ortholog in the Arabidopsis genome. Ehd1 mRNA was induced by 1-wk SD treatment, and Ehd1 may promote flowering by inducing FT-like gene expression only under SD conditions. Microarray analysis further revealed a few MADS box genes downstream of Ehd1. Our results indicate that a novel two-component signaling cascade is integrated into the conserved pathway in the photoperiodic control of flowering in rice.

Subfields: Molecular Biology, Plant Science

View Paper: https://www.semanticscholar.org/paper/9ebc8d82335a1c22cb6c9054ab5eb2c2048ca486

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Citations in the corpus

Identification of major quantitative trait loci qSBR11-1 for sheath blight resistance in rice (2009, background): “Four QTLs for heading date i.e. Hd1, Hd3a, Hd6 and Ehd1 have been cloned (Yano et al. 2000; Kojima et al. 2002; Doi et al. 2004).”
Ghd7 (Ma6) Represses Sorghum Flowering in Long Days: Ghd7 Alleles Enhance Biomass Accumulation and Grain Production (2014, background): “), sorghum, and other grasses, FT-like genes (OsHd3a/OsRFT1, ZCN8) are also regulated by the timing and extent of EARLY HEADING DATE 1 (Ehd1) expression, an activator of FT expression unique to grasses, and by a large number of other genes that modulate Ehd1 and FT expression (Doi et al., 2004; Itoh”
Natural variation in Ghd7 is an important regulator of heading date and yield potential in rice (2008, background): “17 ), and Ehd1 , encoding a B-type response regulato”
Photoperiodic Flowering: Time Measurement Mechanisms in Leaves (2014, background): “Photoperiodic flowering of rice is also regulated by a rice-specific B-type response regulator, Ehd1 (21) (Figure 4a).”
Construction and evaluation of chromosome segment substitution lines carrying overlapping chromosome segments of indica rice cultivar 'Kasalath' in a genetic background of japonica elite cultivar 'Koshihikari' (2005, background): “Some QTLs genetically identified have recently been cloned by adopting a map-based strategy in rice (Yano et al. 2000, Takahashi et al. 2001, Kojima et al. 2002, Doi et al. 2004) and other plant species, such as tomato, maize and Arabidopsis (reviewed by Paran and Zamir 2003).”
Regulation of flowering time: all roads lead to Rome (2011, background): “For example, in rice, Hd3a was regulated independently of Hd1 by the B-type regulator Early Heading Date 1 (Ehd1) [78].”
Hd3a and RFT1 are essential for flowering in rice (2008, background): “RFT1, like Hd3a, is regulated by Hd1 under SD conditions, and its expression is diurnal with a peak at dawn (Fig.”