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Identification of lignin-deficient Brachypodium distachyon (L.) Beauv. mutants induced by gamma radiation

Authors
Lee, Man BoKim, Jae YoonSeo, Yong Weon
Issue Date
5월-2017
Publisher
WILEY
Keywords
lignin; mutation; lignocellulosic bioethanol; enzyme hydrolysis; Brachypodium distachyon; gamma radiation
Citation
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE, v.97, no.7, pp.2159 - 2165
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
Volume
97
Number
7
Start Page
2159
End Page
2165
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/83676
DOI
10.1002/jsfa.8024
ISSN
0022-5142
Abstract
BACKGROUNDBrachypodium 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. RESULTSBrachypodium distachyonM(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. CONCLUSIONThree 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. (c) 2016 Society of Chemical Industry
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