Year-round flowering gene e1, a mutation at the E1 locus on rice chromosome 7 and its combination with green revolution gene sd1 in an isogenic cell line

Motonori Tomita; Yusuke Obara

doi:10.1016/j.gene.2021.146166

Year-round flowering gene e1, a mutation at the E1 locus on rice chromosome 7 and its combination with green revolution gene sd1 in an isogenic cell line

Gene. 2022 Mar 20:815:146166. doi: 10.1016/j.gene.2021.146166. Epub 2022 Jan 4.

Authors

Motonori Tomita¹, Yusuke Obara²

Affiliations

¹ Research Institute of Green Science & Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan. Electronic address: tomita.motonori@shizuoka.ac.jp.
² Research Institute of Green Science & Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan.

PMID: 34995737
DOI: 10.1016/j.gene.2021.146166

Abstract

Genetic analysis on the year-round flowering gene e1, which was derived from Kanto No. 79, an induced mutant by Koshihikari gamma-ray irradiated, was conducted through the backcross process to combine e1 and sd1 in the genetic background of Koshihikari. e1 strongly forwarded flowering 14 days earlier than the original variety Koshihikairi. Isogenic Koshihiakri combining e1 and sd1 was developed by four times of backcross with either Koshihikari or Koshihikari sd1 as recurrent parents by using the e1sd1 homozygous F₃ plant in Koshihikari sd1 × Kanto No. 79 as a non-recurrent parent. As a result, "Koshihikari e1sd1" maturing 14 days earlier was approximately 30 cm shorter than Koshihikari. e1 was linked with DNA markers, which were near to Ghd7 on the short arm of chromosome 7. The whole genome sequencing revealed a single candidate SNP, which is specific to Koshihikari e1sd1, in the Xa21-like sequence, at 35213 bp downstream from Ghd7 on chromosome 7. Koshihikari e1sd1-specific SNP beside Ghd7 is expected to downregulate with Ghd7.

Keywords: E1; Early flowering gene; Gene combination; Induced mutant; Mapping; NGS; Rice; Sd1.

MeSH terms

Chromosome Mapping
Chromosomes, Plant*
Genes, Plant
Genome, Plant
High-Throughput Nucleotide Sequencing
Mutation
Oryza / genetics*
Oryza / growth & development
Plant Breeding
Plant Proteins / genetics*
Polymorphism, Single Nucleotide
Whole Genome Sequencing

Substances

Plant Proteins