Effect of 1-aminocyclopropane-1-carboxylic acid (ACC)-induced ethylene on cellulose synthase A (CesA) genes in flax (Linum usitatissimum L. 'Nike') seedlings

Genes & Genomics
Hansol LimSeung-Eun Oh

Abstract

Cellulose microfibril is a major cell wall polymer that plays an important role in the growth and development of plants. The gene cellulose synthase A (CesA), encoding cellulose synthases, is involved in the synthesis of cellulose microfibrils. However, the regulatory mechanism of CesA gene expression is not well understood, especially during the early developmental stages. To identify factor(s) that regulate the expression of CesA genes and ultimately control seedling growth and development. The presence of cis-elements in the promoter region of the eight CesA genes identified in flax (Linum usitatissimum L. 'Nike') seedlings was verified, and three kinds of ethylene-responsive cis-elements were identified in the promoters. Therefore, the effect of ethylene on the expression of four selected CesA genes classified into Clades 1 and 6 after treatment with 10-4 and 10-3 M 1-aminocyclopropane-1-carboxylic acid (ACC) was examined in the hypocotyl of 4-6-day-old flax seedlings. ACC-induced ethylene either up- or down-regulated the expression of the CesA genes depending on the clade to which these genes belonged, age of seedlings, part of the hypocotyl, and concentration of ACC. Ethylene might be one of the factors regulating the exp...Continue Reading

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