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Title: A sorghum NAC gene is associated with variation in biomass properties and yield potential

Journal Article · · Plant Direct
DOI: https://doi.org/10.1002/pld3.70 · OSTI ID:1461217
 [1];  [2];  [1];  [2];  [1]
  1. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States). Dept. of Crop Sciences
  2. Univ. of California, Berkeley, CA (United States). Dept. of Plant and Microbial Biology

Sorghum bicolor is a C4 grass widely cultivated for grain, forage, sugar, and biomass. The sorghum Dry Stalk (D) locus controls a qualitative difference between juicy green (dd) and dry white (D–) stalks and midribs, and co–localizes with a quantitative trait locus for sugar yield. Here, we apply fine–mapping and genome–wide association study (GWAS) to identify a candidate gene underlying D, and use nearly isogenic lines (NILs) to characterize the transcriptional, compositional, and agronomic effects of variation at the D locus. The D locus was fine–mapped to a 36 kb interval containing four genes. One of these genes is a NAC transcription factor that contains a stop codon in the NAC domain in the recessive (dd) parent. Allelic variation at D affects grain yield, sugar yield, and biomass composition in NILs. Green midrib (dd) NILs show reductions in lignin in stalk tissue and produce higher sugar and grain yields under well–watered field conditions. Increased yield potential in dd NILs is associated with increased stalk mass and moisture, higher biomass digestibility, and an extended period of grain filling. Transcriptome profiling of midrib tissue at the 4–6 leaf stages, when NILs first become phenotypically distinct, reveals that dd NILs have increased expression of a miniature zinc finger (MIF) gene. MIF genes dimerize with and suppress zinc finger homeodomain (ZF–HD) transcription factors, and a ZF–HD gene is associated with midrib color variation in a GWAS analysis across 1,694 diverse sorghum inbreds. A premature stop codon in a NAC gene is the most likely candidate polymorphism underlying the sorghum D locus. More detailed understanding of the sorghum D locus could help improve agronomic potential in cereals.

Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC0012400; DE‐SC0012400
OSTI ID:
1461217
Alternate ID(s):
OSTI ID: 1461218; OSTI ID: 1575207; OSTI ID: 1575208
Journal Information:
Plant Direct, Vol. 2, Issue 7; ISSN 2475-4455
Publisher:
Wiley and American Society of Plant Biologists and Society for Experimental BiologyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

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Characterizing the molecular regulation of inhibitory immune checkpoints with multimodal single-cell screens journal March 2021
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The Xylem and Phloem Transcriptomes from Secondary Tissues of the Arabidopsis Root-Hypocotyl journal May 2005
SND1, a NAC Domain Transcription Factor, Is a Key Regulator of Secondary Wall Synthesis in Fibers of Arabidopsis journal November 2006
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CONSTANS is a photoperiod regulated activator of flowering in sorghum journal January 2014
EIN3 and ORE1 Accelerate Degreening during Ethylene-Mediated Leaf Senescence by Directly Activating Chlorophyll Catabolic Genes in Arabidopsis journal July 2015
Development of High-Density Genetic Maps for Barley and Wheat Using a Novel Two-Enzyme Genotyping-by-Sequencing Approach journal February 2012
The Genetic Architecture of Maize Stalk Strength journal June 2013
TASSEL-GBS: A High Capacity Genotyping by Sequencing Analysis Pipeline journal February 2014
Variation in Biomass Composition Components among Forage, Biomass, Sorghum-Sudangrass, and Sweet Sorghum Types journal January 2012
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NAC-MYB-based transcriptional regulation of secondary cell wall biosynthesis in land plants journal May 2015
NAC Transcription Factors in Senescence: From Molecular Structure to Function in Crops journal July 2015
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Novel Methods to Optimize Genotypic Imputation for Low-Coverage, Next-Generation Sequence Data in Crop Plants journal January 2014

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