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Acid detergent lignin, lodging resistance index, and expression of the caffeic acid O-methyltransferase gene in brown midrib-12 sudangrass

文献类型： 外文期刊

作者： Li, Yuan 1 ; Liu, Guibo 2 ; Li, Jun 3 ; You, Yongliang 2 ; Zhao, Haiming 2 ; Liang, Huan 4 ; Mao, Peisheng 1 ;

作者机构： 1.China Agr Univ, Coll Anim Sci & Technol, Dept Grassland Sci, Beijing 100193, Peoples R China

2.Hebei Acad Agr & Forestry Sci, Dryland Farming Inst, Hengshui 053000, Peoples R China

3.Chinese Acad Agr Sci, Inst Anim Sci, Beijing 100193, Peoples R China

4.Southwest Univ, Dept Anim Sci, Chongqing 400715, Peoples R China

关键词： acid detergent lignin;brown midrib;dry matter;lodging resistance index;sudangrass

期刊名称：BREEDING SCIENCE （ 影响因子：2.086； 五年影响因子：2.632 ）

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收录情况： SCI

摘要： Understanding the relationship between acid detergent lignin (ADL) and lodging resistance index (LRI) is essential for breeding new varieties of brown midrib (bmr) sudangrass (Sorghum sudanense (Piper) Stapf.). In this study, bmr-12 near isogenic lines and their wild-types obtained by back cross breeding were used to compare relevant forage yield and quality traits, and to analyze expression of the caffeic acid O-methyltransferase (COMT) gene using quantitative real time-PCR. The research showed that the mean ADL content of bmr-12 mutants (20.94 g kg(-1)) was significantly (P < 0.05) lower than measured in N-12 lines (43.45 g kg(-1)), whereas the LRI of bmr-12 mutants (0.29) was significantly (P < 0.05) higher than in N-12 lines (0.22). There was no significant correlation between the two indexes in bmr-12 materials (r = -0.44, P > 0.05). Sequence comparison of the COMT gene revealed two point mutations present in bmr-12 but not in the wild-type, the second mutation changed amino acid 129 of the protein from Gin (CAG) to a stop codon (UAG). The relative expression level of COMT gene was significantly reduced, which likely led to the decreased ADL content observed in the bmr-12 mutant.

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[1]Dynamic expression of the nutritive values in forage sorghum populations associated with white, green and brown midrid genotypes. Li, Yuan,You, Yongliang,Zhao, Haiming,Zhai, Lanju,Liu, Guibo,Mao, Peisheng,Wang, Xianguo,Zhang, Wenxu.

[2]Poor post-silking kernel development limits summer maize yield in the North China Plain. Tao, Hongbin,Xia, Laikun,Xu, Lina,Lu, Lihua,Jin, Pengyu,Ming, Bo,Wang, Caicai,Wang, Pu,Xia, Laikun,Xu, Lina,Lu, Lihua,Wang, Caicai. 2015

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