Abstract
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.
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Claims 7
Claim · model-written summary
Rice Ehd1 promotes short-day flowering without functional Hd1.
- Taxon
- rice
Oryza sativae0 - Gene
- Early heading date 1 (Ehd1)e0
- Outcome
- promotion of floweringe0
- Direction
- promotione0
- Qualifier
- in the absence of a functional allele of Hd1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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”
Claim · model-written summary
Rice Ehd1 encodes a B-type response regulator.
- Taxon
- riceOryza sativae0
- Gene
- Early heading date 1 (Ehd1)e0
- Outcome
- encodes a B-type response regulatore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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”
Claim · model-written summary
Ehd1 may lack an Arabidopsis genome ortholog.
- Taxon
- riceOryza sativat0
- Gene
- Ehd1t0
- Outcome
- might not have an ortholog in the Arabidopsis genomee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a B-type response regulator that might not have an ortholog in the Arabidopsis genome.”
t0“Ehd1 , a B-type response regulator in rice”
Claim · model-written summary
One week of short day treatment induced Ehd1 mRNA.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ehd1 mRNA was induced by 1-wk SD treatment”
t0“in rice”
Claim · model-written summary
Ehd1 may induce FT-like gene expression only under short day conditions.
- Taxon
- riceOryza sativat0
- Gene
- Ehd1e0
- Outcome
- FT-like gene expressione0
- Qualifier
- only under SD conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ehd1 may promote flowering by inducing FT-like gene expression only under SD conditions.”
t0“in rice”
Claim · model-written summary
Microarray analysis identified a few MADS box genes downstream of Ehd1.
- Taxon
- riceOryza sativat0
- Gene
- MADS box genese0
- Outcome
- downstream of Ehd1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Microarray analysis further revealed a few MADS box genes downstream of Ehd1.”
t0“in rice”
Claim · model-written summary
Results indicate a two-component signaling cascade joins the conserved flowering pathway in rice.
- Taxon
- riceOryza sativae0
- Outcome
- photoperiodic control of floweringe0
- Qualifier
- a novel two-component signaling cascade is integrated into the conserved pathwaye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a novel two-component signaling cascade is integrated into the conserved pathway in the photoperiodic control of flowering in rice.”
The same questions in other papers
light · phenology · Oryza sativa (rice)Positive and negative results
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