EMS-induced mutation of an endoplasmic reticulum oleate desaturase gene (FAD2-2) results in elevated oleic acid content in rapeseed (Brassica napus L.)

The development of rapeseed cultivars ( Brassica napus L.) with high oleic acid and low linolenic acid is highly desirable for food and industrial applications. In this study, the Korean rapeseed cultivar Tamla was used for ethyl methanesulfonate (EMS)-induced mutagenesis and seed oils were screened...

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Veröffentlicht in:Euphytica 2018-02, Vol.214 (2), p.1-12, Article 28
Hauptverfasser: Lee, Yong-Hwa, Park, Won, Kim, Kwang-Soo, Jang, Young-Seok, Lee, Ji-Eun, Cha, Young-Lok, Moon, Youn-Ho, Song, Yeon-Sang, Lee, Kyeongbo
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container_title Euphytica
container_volume 214
creator Lee, Yong-Hwa
Park, Won
Kim, Kwang-Soo
Jang, Young-Seok
Lee, Ji-Eun
Cha, Young-Lok
Moon, Youn-Ho
Song, Yeon-Sang
Lee, Kyeongbo
description The development of rapeseed cultivars ( Brassica napus L.) with high oleic acid and low linolenic acid is highly desirable for food and industrial applications. In this study, the Korean rapeseed cultivar Tamla was used for ethyl methanesulfonate (EMS)-induced mutagenesis and seed oils were screened up to generation M 7 for high oleate mutants. Two mutant populations (M 7 ) with an average of approximately 76% oleic acid content were isolated. Yield components between two mutant populations and untreated Tamla plants were not substantially different, although the mutants in the vegetative stage were slightly smaller in size than Tamla. Genomic analyses of six fatty acid desaturase (four FAD2 and two FAD6 ) genes revealed that the elevated oleic acid content in the mutants is the result of single gene mutations. Changes in DNA sequence were observed in two genes out of six fatty acid desaturase (four FAD2 and two FAD6 ). FAD2 - 2 exhibited a 2-bp deletion in the upstream region of the gene in the two mutants, resulting in a severely truncated polypeptide (57 aa instead of 469 aa), while six point mutations in the other gene did not result in changes in the amino acid sequence. Based on these results, FAD2-2, an endoplasmic reticulum (ER) oleic acid desaturase, is affected in the mutants, resulting in a ~ 7% increase in oleic acid content in comparison to untreated Tamla plants. The induced mutants could be utilized for the development of high oleic oil rapeseed varieties and for regulatory studies of lipid metabolism in seed oils.
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FAD2 - 2 exhibited a 2-bp deletion in the upstream region of the gene in the two mutants, resulting in a severely truncated polypeptide (57 aa instead of 469 aa), while six point mutations in the other gene did not result in changes in the amino acid sequence. Based on these results, FAD2-2, an endoplasmic reticulum (ER) oleic acid desaturase, is affected in the mutants, resulting in a ~ 7% increase in oleic acid content in comparison to untreated Tamla plants. 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subjects Amino acid sequence
Amino acids
Biomedical and Life Sciences
Biotechnology
Brassica
Brassica napus
Cultivars
Deoxyribonucleic acid
Desaturase
DNA
Edible oils
Endoplasmic reticulum
Ethyl methanesulfonate
Fatty acids
Food industry
Gene deletion
Genes
Genomic analysis
Industrial applications
Life Sciences
Linolenic acid
Lipid metabolism
Metabolism
Mutagenesis
Mutants
Mutation
Nucleotide sequence
Oils & fats
Oleic acid
Oleic acid desaturase
Plant Genetics and Genomics
Plant Pathology
Plant Physiology
Plant Sciences
Plants (botany)
Populations
Rape plants
Rapeseed
Seeds
title EMS-induced mutation of an endoplasmic reticulum oleate desaturase gene (FAD2-2) results in elevated oleic acid content in rapeseed (Brassica napus L.)
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