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Title: Transcriptomic analysis of field-droughted sorghum from seedling to maturity reveals biotic and metabolic responses

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America

Drought is the most important environmental stress limiting crop yields. The C4 cereal sorghum [ Sorghum bicolor (L.) Moench] is a critical food, forage, and emerging bioenergy crop that is notably drought-tolerant. We conducted a large-scale field experiment, imposing preflowering and postflowering drought stress on 2 genotypes of sorghum across a tightly resolved time series, from plant emergence to postanthesis, resulting in a dataset of nearly 400 transcriptomes. We observed a fast and global transcriptomic response in leaf and root tissues with clear temporal patterns, including modulation of well-known drought pathways. We also identified genotypic differences in core photosynthesis and reactive oxygen species scavenging pathways, highlighting possible mechanisms of drought tolerance and of the delayed senescence, characteristic of the stay-green phenotype. Finally, we discovered a large-scale depletion in the expression of genes critical to arbuscular mycorrhizal (AM) symbiosis, with a corresponding drop in AM fungal mass in the plants’ roots.

Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC0014081; SC0012460; AC02-05CH11231
OSTI ID:
1577228
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English

References (43)

Screening for drought tolerance in Sorghum using cell culture journal October 1985
Arbuscular mycorrhizal symbiosis alters stomatal conductance of host plants more under drought than under amply watered conditions: a meta-analysis journal May 2014
Water relations, drought and vesicular-arbuscular mycorrhizal symbiosis journal May 2001
Sorghum bicolor’s Transcriptome Response to Dehydration, High Salinity and ABA journal July 2005
Stay-green plants: what do they tell us about the molecular mechanism of leaf senescence journal June 2013
Overexpression of OsWRKY72 gene interferes in the abscisic acid signal and auxin transport pathway of Arabidopsis journal July 2010
Natural variation and genetic constraints on drought tolerance journal June 2013
Impact of drought on photosynthesis: Molecular perspective journal September 2017
Revisiting the Non-Animal Peroxidase Superfamily journal December 2015
The Pivotal Role of Ethylene in Plant Growth journal April 2018
Colonisation with the arbuscular mycorrhizal fungus Glomus mosseae (Nicol. & Gerd.) enhanced phosphorus uptake from dry soil in Sorghum bicolor (L.) journal April 2004
The Sorghum bicolor genome and the diversification of grasses journal January 2009
Influence of extreme weather disasters on global crop production journal January 2016
Whole-genome sequencing reveals untapped genetic potential in Africa’s indigenous cereal crop sorghum journal August 2013
Strong succession in arbuscular mycorrhizal fungal communities journal August 2018
Stay green trait in grain sorghum: relationship between visual rating and leaf chlorophyll concentration journal August 2000
The alternative oxidase lowers mitochondrial reactive oxygen production in plant cells journal July 1999
Five ways to stay green journal February 2000
Sorghum stay-green QTL individually reduce post-flowering drought-induced leaf senescence journal November 2006
Transcriptomic analysis comparing stay-green and senescent Sorghum bicolor lines identifies a role for proline biosynthesis in the stay-green trait journal August 2015
The Role of WRKY Transcription Factors in Plant Immunity: Figure 1. journal May 2009
Two Transcription Factors, DREB1 and DREB2, with an EREBP/AP2 DNA Binding Domain Separate Two Cellular Signal Transduction Pathways in Drought- and Low-Temperature-Responsive Gene Expression, Respectively, in Arabidopsis journal August 1998
Plant Signaling and Metabolic Pathways Enabling Arbuscular Mycorrhizal Symbiosis journal August 2017
The effect of drought and heat stress on reproductive processes in cereals journal October 2007
Exploring genetic and expression differences between physiologically extreme ecotypes: comparative genomic hybridization and gene expression studies of Kas-1 and Tsu-1 accessions of Arabidopsis thaliana: Genomic studies of Arabidopsis accessions journal March 2010
ROS and redox signalling in the response of plants to abiotic stress: ROS and redox signalling in plants journal June 2011
Stay-green alleles individually enhance grain yield in sorghum under drought by modifying canopy development and water uptake patterns journal June 2014
Alternative oxidase respiration maintains both mitochondrial and chloroplast function during drought journal August 2016
Diverse Sorghum bicolor accessions show marked variation in growth and transcriptional responses to arbuscular mycorrhizal fungi journal January 2019
The Sorghum bicolor reference genome: improved assembly, gene annotations, a transcriptome atlas, and signatures of genome organization journal December 2017
Increased precipitation, rather than warming, exerts a strong influence on arbuscular mycorrhizal fungal community in a semiarid steppe ecosystem journal June 2016
Predisposition in Plant Disease: Exploiting the Nexus in Abiotic and Biotic Stress Perception and Response journal August 2014
Functional annotation of the transcriptome of Sorghum bicolor in response to osmotic stress and abscisic acid journal October 2011
Transcriptomic analysis of Sorghum bicolor responding to combined heat and drought stress journal January 2014
Drought stress tolerance strategies revealed by RNA-Seq in two sorghum genotypes with contrasting WUE journal May 2016
Identification and analysis of glutathione S-transferase gene family in sweet potato reveal divergent GST-mediated networks in aboveground and underground tissues in response to abiotic stresses journal November 2017
Simultaneous Transcriptome Analysis of Sorghum and Bipolaris sorghicola by Using RNA-seq in Combination with De Novo Transcriptome Assembly journal April 2013
Selection System for the Stay-Green Drought Tolerance Trait in Sorghum Germplasm journal January 2010
Leaf Photoassimilation and Partitioning in Stress-Tolerant Sorghum journal January 1997
Mycorrhizal Fungi journal January 1974
Crop Production under Drought and Heat Stress: Plant Responses and Management Options journal June 2017
Overexpression of Ferredoxin, PETF, Enhances Tolerance to Heat Stress in Chlamydomonas reinhardtii journal October 2013
Over-represented promoter motifs in abiotic stress-induced DREB genes of rice and sorghum and their probable role in regulation of gene expression journal July 2010