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Allelic Differentiation at the E1/Ghd7 Locus Has Allowed Expansion of Rice Cultivation Area.


ABSTRACT: The photoperiod-insensitivity allele e1 is known to be essential for the extremely low photoperiod sensitivity of rice, and thereby enabled rice cultivation in high latitudes (42-53° north (N)). The E1 locus regulating photoperiod-sensitivity was identified on chromosome 7 using a cross between T65 and its near-isogenic line T65w. Sequence analyses confirmed that the E1 and the Ghd7 are the same locus, and haplotype analysis showed that the e1/ghd7-0a is a pioneer allele that enabled rice production in Hokkaido (42-45° N). Further, we detected two novel alleles, e1-ret/ghd7-0ret and E1-r/Ghd7-r, each harboring mutations in the promoter region. These mutant alleles alter the respective expression profiles, leading to marked alteration of flowering time. Moreover, e1-ret/ghd7-0ret, as well as e1/ghd7-0a, was found to have contributed to the establishment of Hokkaido varieties through the marked reduction effect on photoperiod sensitivity, whereas E1-r/Ghd7-r showed a higher expression than the E1/Ghd7 due to the nucleotide substitutions in the cis elements. The haplotype analysis showed that two photoperiod-insensitivity alleles e1/ghd7-0a and e1-ret/ghd7-0ret, originated independently from two sources. These results indicate that naturally occurring allelic variation at the E1/Ghd7 locus allowed expansion of the rice cultivation area through diversification and fine-tuning of flowering time.

SUBMITTER: Saito H 

PROVIDER: S-EPMC6963527 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature

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Allelic Differentiation at the <i>E1/Ghd7</i> Locus Has Allowed Expansion of Rice Cultivation Area.

Saito Hiroki H   Okumoto Yutaka Y   Tsukiyama Takuji T   Xu Chong C   Teraishi Masayoshi M   Tanisaka Takatoshi T  

Plants (Basel, Switzerland) 20191128 12


The photoperiod-insensitivity allele <i>e1</i> is known to be essential for the extremely low photoperiod sensitivity of rice, and thereby enabled rice cultivation in high latitudes (42-53° north (N)). The <i>E1</i> locus regulating photoperiod-sensitivity was identified on chromosome 7 using a cross between T65 and its near-isogenic line T65w. Sequence analyses confirmed that the <i>E1</i> and the <i>Ghd7</i> are the same locus, and haplotype analysis showed that the <i>e1/ghd7-0a</i> is a pion  ...[more]

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