Transcriptomic analysis of a Sorghum bicolor landrace identifies a role for beta-alanine betaine biosynthesis in drought tolerance

被引:17
作者
Devnarain, N. [1 ,2 ]
Crampton, B. G. [2 ,3 ]
Olivier, N. [2 ,3 ]
van der Westhuyzen, C. [1 ]
Becker, J. V. W. [4 ]
O'Kennedy, M. M. [1 ]
机构
[1] CSIR, Biosci, Pretoria, South Africa
[2] Univ Pretoria, Dept Plant & Soil Sci, Pretoria, South Africa
[3] Univ Pretoria, FABI, Pretoria, South Africa
[4] ACGT, Pretoria, South Africa
基金
新加坡国家研究基金会;
关键词
Beta-alanine betaine; Drought tolerance; Landrace; Sorghum; Transcriptomics; ASPARTATE-ALPHA-DECARBOXYLASE; ABIOTIC STRESS TOLERANCE; LIMONIUM-LATIFOLIUM; N-METHYLTRANSFERASE; SIGNAL-TRANSDUCTION; CEREAL LANDRACES; HIGH-SALINITY; WATER-STRESS; ARABIDOPSIS; EXPRESSION;
D O I
10.1016/j.sajb.2019.08.049
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Sorghum is indigenous to Africa and a remarkably drought tolerant cereal crop. In this study, the genetic response mechanisms involved in sorghum's tolerance to progressive water deficit and re-watering were investigated in a South African landrace (designated LR6), using cDNA microarrays comprising 35,899 transcript probes. Significant differential expression of 902 transcripts, including 128 transcripts with currently unknown functions, was altered in response to progressive water stress and re-watering. The modulated sorghum genes had homology to proteins involved in growth, regulation, and protection. Gene Ontology (GO) analysis identified significant enrichment of 26 genes involved in the 'response to abiotic stimulus' GO category during severe stress. The expression of two genes associated with beta(beta)-alanine betaine biosynthesis was validated with quantitative RT-PCR. Importantly, the detection of beta-alanine betaine in sorghum leaf extracts using NMR spectroscopy, and the significant increase in relative abundance during severe stress supports the microarray and qRT-PCR findings, thereby highlighting a role for beta-alanine betaine biosynthesis in drought tolerance of sorghum. In future, crop improvement initiatives that consider metabolic engineering of the beta-alanine betaine biosynthesis pathway should be explored. (C) 2019 SAAB. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:244 / 255
页数:12
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