Hd1, a major photoperiod sensitivity quantitative trait locus in rice, is closely related to the Arabidopsis flowering time gene CONSTANS.
A major quantitative trait locus (QTL) controlling response to photoperiod, Hd1, was identified by means of a map-based cloning strategy. High-resolution mapping using 1505 segregants enabled us to define a genomic region of approximately 12 kb as a candidate for Hd1. Further analysis revealed that the Hd1 QTL corresponds to a gene that is a homolog of CONSTANS in Arabidopsis. Sequencing analysis revealed a 43-bp deletion in the first exon of the photoperiod sensitivity 1 (se1) mutant HS66 and a 433-bp insertion in the intron in mutant HS110. Se1 is allelic to the Hd1 QTL, as determined by analysis of two se1 mutants, HS66 and HS110. Genetic complementation analysis proved the function of the candidate gene. The amount of Hd1 mRNA was not greatly affected by a change in length of the photoperiod. We suggest that Hd1 functions in the promotion of heading under short-day conditions and in inhibition under long-day conditions.
Yano
M
M
National Institute of Agrobiological Resources, Tsukuba, Ibaraki 305-8602, Japan.
Katayose
Y
Y
Ashikari
M
M
Yamanouchi
U
U
Monna
L
L
Fuse
T
T
Baba
T
T
Yamamoto
K
K
Umehara
Y
Y
Nagamura
Y
Y
Sasaki
T
T
D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000235:genetics*; D029681:Arabidopsis Proteins; D001483:Base Sequence; D017931:DNA Primers; D004268:DNA-Binding Proteins / Q000235:genetics*; D005816:Genetic Complementation Test; D006655:Histone Deacetylases; D018398:Homeodomain Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D012275:Oryza / Q000235:genetics; D017440:Photoperiod; D030821:Plants, Genetically Modified / Q000235:genetics; D019655:Quantitative Trait, Heritable; D017386:Sequence Homology, Amino Acid; D014157:Transcription Factors / Q000235:genetics*
D029681:Arabidopsis Proteins; C092776:CONSTANS protein, Arabidopsis; D017931:DNA Primers; D004268:DNA-Binding Proteins; C484391:Hd1 protein, Arabidopsis; D018398:Homeodomain Proteins; D014157:Transcription Factors; D006655:Histone Deacetylases