QTL analysis of salt tolerance in Sorghum bicolor during whole‐plant growth stages

doi:10.1111/pbr.12805

Specific Objectives: 1. To identify the gene(s) underlying a major QTL for stem sugar concentration located on chromosome 3. 2. To identify QTL for stem juice volume and stalk sugar concentration and to identify the underlying genes. 3. To classify 60 novel sorghum bmr mutants from the USDA TILLING population in allelic groups based on cell wall chemistry and allelism tests. 4. To select representative bmr mutants from each allelic group and selected NIR spectral mutants for their potential value as feedstock for ethanol production. 5. To clone and characterize those Bmr genes that represent loci other than Bmr12 andmore » Bmr6 using a mapping and a candidate gene approach. Objective 1 The experiments for this objective are largely complete and the data have been analyzed. Data interpretation and follow-up experiments are still in progress. A manuscript is in preparation (Vermerris et al.; see publication list for full details). The main results are: 1) 16 cDNA libraries were prepared and sequenced at Cornell University. The libraries represent internode tissue and flag leaf tissue at booting, internode tissue and peduncle at soft-dough stage, from two plants per sampling time with the Rio allele for the QTL on chromosome 3, and two plants with the BTx623 allele on chromosome 3 (4 tissues x 2 genotypes x 2 replicates) 2) 480 million 86-nucleotide reads were generated from four lanes of Illuminia HiSeqII 3) 74% of the reads could be mapped to the sorghum transcriptome, indicative of good sequence quality 4) Of the 216 genes within the QTL, 17 genes were differentially expressed among plants with and without the Rio QTL. None of these 17 genes had obvious roles in sucrose metabolism 5) Clustering algorithms identified a group of 721 co-expressed genes. One of these genes is a sucrose synthase gene. This cluster also contains 10 genes from the QTL. 6) Among these co-expressed genes are regulatory genes for which knock-out lines in Arabidopsis have been obtained. Analysis of these lines is in progress. Objective 2 The experiments from this objective have been completed and the data were published in the journal Crop Science by Felderhoff et al. (2012). A second publication by Felderhoff et al. is in progress (see publication list for full details). The experiments were based on a mapping population derived from the sweet sorghum 'Rio' and the dry-stalk grain sorghum BTx3197. The main findings were: 1) The apparent juiciness of the sorghum stalk, based on the appearance of a cut stem surface (moist vs. pithy), is not representative of the moisture content of the stalk. This was surprising, as pithy stalks have been associated with low moisture content. This means that in order to assess 'juiciness', a different evaluation needs to be used, for example by removing juice with a roller press or by measuring the difference in mass between a fresh and dried stalk segment. 2) A total of five QTLs associated with juice volume (corrected for height) or moisture content were identified, but not all QTLs were detected in all environments, providing evidence for genotype x environment interactions. This finding complicates breeding for juice volume using marker-assisted selection. 3) The QTL for sugar concentration identified on chromosome 3, and the subject of Objective 1, was confirmed in this mapping population, but unlike in previous studies (Murray et al., 2008), the presence of this QTL was associated with negative impacts on agronomic performance (fresh and dry biomass yield, juice yield). Consequently, introgression of the Brix QTL from Rio as part of a commercial breeding program will require monitoring of the precise impacts of this QTL on agronomic performance. 4) The absence of dominance effects for the Brix trait (= sugar concentration) indicated that Brix must be high in both parents to produce high Brix in hybrids. This means an extra constraint on the development of hybrid parents. With the results from Objective 1, the selection of progeny containing favorable alleles for sugar concentration is expected to be more efficient. Objectives 3 and 4 The experiments from these objectives have been completed. Some of the data have been published in the journal BioEnergy Research (Sattler et al. 2012) and in a book chapter on the utilization of sorghum biomass by Vermerris and Saballos (2012) (see publication list for full details). One manuscript is in progress and is expected to be submitted in 2013. The experiments for these objectives were based on the characterization of a set of novel sorghum mutants identified in a TILLING population generated by Dr. Zhanguo Xin (USDA-RS, Lubbock, TX). The main findings were: 1) Based on allelism tests of bmr mutants from the USDA TILLING population, there are three novel sorghum bmr loci, currently referred to as bmr-20, bmr-100 and bmr-1107. This brings the total number of bmr loci to a maximum of seven (manuscript in preparation). 2) The biomass conversion properties of the novel bmr mutants are not significantly better than the wildtype control, limiting their utility for bioenergy production (manuscript in preparation). This also means that all three bmr loci that positively influence biomass conversion (bmr2, bmr6 and bmr12) have been cloned. Two of these genes (Bmr6 and Bmr2) were cloned with funding from this project. 3) Four novel mutant alleles of bmr12 were identified and characterized. These mutants alleles are bmr12-30, bmr12-34, bmr12-35and bmr12-820, and they all contain missense mutations, leading to amino acid substitutions with varying effects on lignin content and lignin subunit composition (syringyl/guaiacyl ratio). One of the mutants, bmr-35, represents a phenotype that is intermediate between the wild type and the bmr12-reference mutant, which is a null mutant. This intermediate phenotype may offer a balance between enhanced biomass conversion properties and good agronomic performance (Sattler et al., 2012). 4) It is possible to identify sorghum mutants with altered biomass conversion properties using analysis of leaf segments by near infrared reflectance spectroscopy (NIRS). Approximately 10% of 200 M3 families contained spectral outliers suggestive of cell wall changes, and half of those showed variation in biomass conversion efficiency (Vermerris and Saballos, 2012). Objective 5 The experiments from this objective were completed and the data were published by Saballos et al. (2012) in The Plant Journal. The main findings were: 1) The Bmr2 gene encodes the main 4-coumarate CoA ligase in sorghum; the genetic proof consisted of showing how two independent mutations in this gene both resulted in the same phenotype, and by showing that these mutations were allelic. Reduced Bmr2 activity leads to reduced lignin content and brown vascular tissue. 2) Allele-specific molecular markers were developed so that the inheritance of these recessive alleles can be tracked in sorghum breeding programs aimed at improving biomass conversion. 3) Together with four other bona fide 4CL genes, the Bmr2 gene is a member of a multigene family in sorghum. Based on phylogentic analysis, one of those genes is involved in flavonoid metabolism, the others in monolignol biosynthesis. Enzymatic activities for the enzymes encoded by Bmr2 and itsparalogs were determined. 4) Both bmr2 mutations are missense mutations that result in the substitution of apolar amino acids with polar amino acids. In both cases, these substitutions are in hydrophobic domains, which destabilize the protein, leading to degradation. This is apparent from western blots and activity assays with heterologously expressed enzymes. 5) The plant tries to compensate for the reduced 4CL activity by increasing the expression of Bmr2 and its paralogs. As a result of the higher expression levels of the paralogs, there is enough 4CL activity to minimize negative impacts on growth and development. List of all publications to date in which the funding of this project is acknowledged 1) Vermerris W, Saballos A (2012) Genetic enhancement of sorghum for biomass utilization. In Paterson, A. (Ed.) Genetics and Genomics of the Saccharinae, Springer, New York, NY. pp. 391-428. 2) Felderhoff T, Murray SC, Klein PE, Sharma A, Hamblin MT, Kresovich S, Vermerris W, Rooney, WL (2012) QTLs for energy-related traits in a sweet x grain sorghum [Sorghum bicolor (L.) Moench] mapping population. Crop Science 52: 2040-2049. 3) Sattler SE, Palmer NA, Saballos A, Greene AM, Xin Z, Sarath G, Vermerris W, Pedersen JF (2012) Identification and characterization of four missense mutations in Brown midrib12 (Bmr12), the caffeic acid O-methyltranferase (COMT) of sorghum. BioEnergy Research (in press) DOI 10.1007/s12155-012-9197-z 4) Saballos A, Sattler S, Sanchez E, Foster TP, Xin Z, Kang CH, Pedersen J, Vermerris W (2012). Brown midrib2 encodes the major 4-coumarate:CoA ligase involved in lignin biosynthesis in sorghum (Sorghum bicolor (L.) Moench). The Plant Journal 70: 818-830. doi: 10.1111/j.1365-313X.2012.04933. 5) Vermerris, W (2011) Survey of genomics approaches to improve bioenergy traits in maize, sorghum and sugarcane. Journal of Integrative Plant Biology 53: 105-119 6) Saballos A, Ejeta G, Sanchez E, Kang CH, Vermerris W (2009) A genome-wide analysis of the cinnamyl alcohol dehydrogenase family in sorghum [Sorghum bicolor (L.) Moench] identifies SbCAD2 as the Brown midrib6 gene. Genetics 181: 783-795. 7) Saballos A, Vermerris W, Rivera L, Ejeta G (2008) Allelic association, chemical characterization and saccharification properties of brown midrib mutants of sorghum (Sorghum bicolor (L.) Moench). BioEnergy Research 2: 193-204 8) Felderhoff TJ. (2012) QTLs for energy related traits in a sweet x grain RIL sorghum [Sorghum bicolor (L.) Moench] population. M.S. Thesis, Texas A&M University. Publications in preparation (tentative titles) 9) Felderhoff T, Murray SC, Klein PE, Sharma A, Hamblin MT, Kresovich S, Vermerris W, Rooney, WL (2013) QTLs for biomass and juice composition in a sweet x grain sorghum [Sorghum bicolor (L.) Moench] mapping population. 10) Vermerris W, Fear J, Saballos A, Murray SC, Rooney WL, Kresovich S. Identification of candidate genes for sucrose accumulation in sweet sorghum using RNA-seq. 11) Sattler SE, Palmer NA, Saballos A, Xin Z, Vermerris W, Pedersen JF. Characterization of novel sorghum brown midrib mutants. Presentations since last progress report truncated due to space limitations.

This content will become publicly available on January 21, 2021

Title: QTL analysis of salt tolerance in Sorghum bicolor during whole‐plant growth stages

Citation Formats

Detection of QTLs for salt tolerance in Asian barley (Hordeum vulgare L.) by association analysis with SNP markers
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Identification of QTLs associated with salinity tolerance at late growth stage in barley
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Salt tolerance and salinity effects on plants: a review
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The Sorghum bicolor genome and the diversification of grasses
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Advanced Backcross QTL Analysis for the Whole Plant Growth Duration Salt Tolerance in Rice (Oryza sativa L.)
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Planting Sweet Sorghum in Yellow River Delta: The Cultivation Measure, Yield and Effect on Soil Microflora
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Genomics of Sorghum
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Genome-wide patterns of genetic variation in sweet and grain sorghum (Sorghum bicolor)
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Genetic Diversity and Association Analysis for Salinity Tolerance, Heading Date and Plant Height of Barley Germplasm Using Simple Sequence Repeat Markers
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Salinity Effects on Seed Yield, Growth, and Germination of Grain Sorghum 1
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Stress indices and selectable traits in SALTOL QTL introgressed rice genotypes for reproductive stage tolerance to sodicity and salinity stresses
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The Sorghum bicolor reference genome: improved assembly, gene annotations, a transcriptome atlas, and signatures of genome organization
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Sweet sorghum as biofuel feedstock: recent advances and available resources
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Perturbed reproductive development in salt-treated Sorghum bicolor: a consequence of modifications in regulation networks?
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Location of major effect genes in sorghum (Sorghum bicolor (L.) Moench)
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QTL mapping of bio-energy related traits in Sorghum
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A Genomic Scan for Selection Reveals Candidates for Genes Involved in the Evolution of Cultivated Sunflower ( Helianthus annuus )
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Sweet sorghum productivity for biofuels under increased soil salinity and reduced irrigation
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Genomic selection in plant breeding: from theory to practice
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Identification of QTLs for Salt Tolerance Traits and Prebreeding Lines with Enhanced Salt Tolerance in an Introgression Line Population of Rice
journal, September 2018

Identification of QTLs for salt tolerance at germination and seedling stage of Sorghum bicolor L. Moench
journal, November 2013

Whole-genome sequencing reveals untapped genetic potential in Africa’s indigenous cereal crop sorghum
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Identification and validation of QTLs controlling multiple traits in sorghum
journal, January 2016

Mapping of a major QTL for salt tolerance of mature field-grown maize plants based on SNP markers
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Extensive Variation in the Density and Distribution of DNA Polymorphism in Sorghum Genomes
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Characterization and genetic control of germination-emergence responses of grain sorghum to salinity
journal, January 1994

This content will become publicly available on January 21, 2021

Title: QTL analysis of salt tolerance in Sorghum bicolor during whole‐plant growth stages

Citation Formats

Detection of QTLs for salt tolerance in Asian barley (Hordeum vulgare L.) by association analysis with SNP markers journal, January 2014

Identification of QTLs associated with salinity tolerance at late growth stage in barley journal, April 2009

Salt tolerance and salinity effects on plants: a review journal, March 2005

The Sorghum bicolor genome and the diversification of grasses journal, January 2009

Advanced Backcross QTL Analysis for the Whole Plant Growth Duration Salt Tolerance in Rice (Oryza sativa L.) journal, August 2014

Planting Sweet Sorghum in Yellow River Delta: The Cultivation Measure, Yield and Effect on Soil Microflora journal, May 2012

Genomics of Sorghum journal, January 2008

Genome-wide patterns of genetic variation in sweet and grain sorghum (Sorghum bicolor) journal, January 2011

Genetic Diversity and Association Analysis for Salinity Tolerance, Heading Date and Plant Height of Barley Germplasm Using Simple Sequence Repeat Markers journal, August 2008

Salinity Effects on Seed Yield, Growth, and Germination of Grain Sorghum 1 journal, March 1907

Stress indices and selectable traits in SALTOL QTL introgressed rice genotypes for reproductive stage tolerance to sodicity and salinity stresses journal, December 2013

The Sorghum bicolor reference genome: improved assembly, gene annotations, a transcriptome atlas, and signatures of genome organization journal, December 2017

Sweet sorghum as biofuel feedstock: recent advances and available resources journal, June 2017

Perturbed reproductive development in salt-treated Sorghum bicolor: a consequence of modifications in regulation networks? journal, September 2005

Location of major effect genes in sorghum (Sorghum bicolor (L.) Moench) journal, June 2010

QTL mapping of bio-energy related traits in Sorghum journal, October 2011

A Genomic Scan for Selection Reveals Candidates for Genes Involved in the Evolution of Cultivated Sunflower ( Helianthus annuus ) journal, November 2008

Sweet sorghum productivity for biofuels under increased soil salinity and reduced irrigation journal, January 2011

Genomic selection in plant breeding: from theory to practice journal, February 2010

Identification of QTLs for Salt Tolerance Traits and Prebreeding Lines with Enhanced Salt Tolerance in an Introgression Line Population of Rice journal, September 2018

Identification of QTLs for salt tolerance at germination and seedling stage of Sorghum bicolor L. Moench journal, November 2013

Whole-genome sequencing reveals untapped genetic potential in Africa’s indigenous cereal crop sorghum journal, August 2013

Identification and validation of QTLs controlling multiple traits in sorghum journal, January 2016

Mapping of a major QTL for salt tolerance of mature field-grown maize plants based on SNP markers journal, August 2017

Extensive Variation in the Density and Distribution of DNA Polymorphism in Sorghum Genomes journal, November 2013

Characterization and genetic control of germination-emergence responses of grain sorghum to salinity journal, January 1994