Four cellulose synthase genes were identified by analysis of their class-specific regions (CSRII) in plants of fiber flax during the "rapid growth" stage. These genes were designated as LusCesA1, LusCesA4, LusCesA7 and LusCesA9. LusCesA4, LusCesA7, and LusCesA9 genes were expressed in the stem; LusCesA1 and LusCesA4 genes were expressed in the apex part of plants, and the LusCesA4 gene was expressed in the leaves of fiber flax. The expression of the LusCesA7 and LusCesA9 genes was specific to the stems of fiber flax. These genes may influence the quality of the flax fiber.
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