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Identification of lignin‐deficient Brachypodium distachyon (L.) Beauv. mutants induced by gamma radiation
Author(s) -
Lee Man Bo,
Kim Jae Yoon,
Seo Yong Weon
Publication year - 2017
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.8024
Subject(s) - brachypodium distachyon , brachypodium , lignin , mutant , identification (biology) , botany , biology , chemistry , biochemistry , gene , genome
BACKGROUND Brachypodium distachyon (L.) Beauv. is a monocotyledonous model plant that has been studied to understand a range of biological phenomena for lignocellulosic bioethanol feedstocks and other cereal crops. The lignin makes its cell walls recalcitrant to saccharification, constituting the main barrier to lignocellulosic bioethanol production. In this study, lignin‐deficient mutants of B. distachyon induced by chronic radiation were selected and the effects of the mutants on fermentable glucose production were identified. RESULTS Brachypodium distachyon M 2 mutants induced by chronically irradiated gamma radiation were screened by the Wiesner test. Lignin‐deficient M 2 mutants were further confirmed in subsequent M 3 and M 4 generations by determining acetyl bromide‐soluble lignin. The lignin content was significantly reduced in mutant plants 135‐2 (by 7.99%), 142‐3 (by 13.8%) and 406‐1 (by 8.13%) compared with the wild type. Moreover, fermentable glucose was significantly higher in 135‐2 (by 23.91%) and 142‐3 (by 36.72%) than in the wild type after 72 h of enzymatic hydrolysis. CONCLUSION Three lignin‐deficient B. distachyon mutants induced by chronically irradiated gamma radiation were obtained. This study will provide fundamental understanding of the B. distachyon cell wall and could contribute to increases in bioethanol production using bioenergy crops. © 2016 Society of Chemical Industry