Next Article in Journal
Carotenoids in Cereal Food Crops: Composition and Retention throughout Grain Storage and Food Processing
Previous Article in Journal
Physiological Effects of Exogenously Applied Reflectants and Anti-Transpirants on Leaf Temperature and Fruit Sunburn in Citrus
Previous Article in Special Issue
The Development and Characterization of Near-Isogenic and Pyramided Lines Carrying Resistance Genes to Brown Planthopper with the Genetic Background of Japonica Rice (Oryza sativa L.)
Open AccessArticle

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

Graduate School of Agriculture, Kyoto University, Kyoto, Kyoto 606-8502, Japan
Tropical Agriculture Research Front, Japan International Research Center of Agricultural Science, Ishigaki, Okinawa 907-0002, Japan
Faculty of Agriculture, Kindai University, Nara, Nara 631-8505, Japan
School of Agriculture, Kibi International University, Minami-Awaji 656-0484, Japan
Author to whom correspondence should be addressed.
Plants 2019, 8(12), 550;
Received: 9 September 2019 / Revised: 22 November 2019 / Accepted: 25 November 2019 / Published: 28 November 2019
(This article belongs to the Special Issue Genetics in Rice)
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. View Full-Text
Keywords: rice; flowering time; photoperiod sensitivity; allelic variation; fine-tuning rice; flowering time; photoperiod sensitivity; allelic variation; fine-tuning
Show Figures

Figure 1

MDPI and ACS Style

Saito, H.; Okumoto, Y.; Tsukiyama, T.; Xu, C.; Teraishi, M.; Tanisaka, T. Allelic Differentiation at the E1/Ghd7 Locus Has Allowed Expansion of Rice Cultivation Area. Plants 2019, 8, 550.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

Back to TopTop