Another important activator ofHd3aexpression is Early
heading date1 (Ehd1), a B-type response regulator
protein [26]. Ehd1 can bind DNA through its GARP
(maize GOLDEN2, the ARR B-class proteins fromArabidopsis, and Chlamydomonas Psr1) domain, and mutation
of this domain or RNAi suppression of this gene
decreased Hd3a expression under SD conditions
[26,27]. Interestingly, Ehd1is an evolutionarily unique
gene that does not have an ortholog in the Arabidopsis
Another important activator ofHd3aexpression is Earlyheading date1 (Ehd1), a B-type response regulatorprotein [26]. Ehd1 can bind DNA through its GARP(maize GOLDEN2, the ARR B-class proteins fromArabidopsis, and Chlamydomonas Psr1) domain, and mutationof this domain or RNAi suppression of this genedecreased Hd3a expression under SD conditions[26,27]. Interestingly, Ehd1is an evolutionarily uniquegene that does not have an ortholog in the Arabidopsis
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