Registration of RTx3410 through RTx3428 Sorghum Germplasm Resistant to Sugarcane Aphid [<i>Melanaphis sacchari</i> (Zehntner)]

Peterson, G. C.; Armstrong, J. Scott; Pendleton, Bonnie B.; Stelter, M.; Brewer, Michael J.

doi:10.3198/jpr2018.02.0007crg

Cited by 19 publications

(9 citation statements)

References 17 publications

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“…For example, SC110, a converted version of an Ethiopian caudatum landrace (PI 257599/IS 12610) identified as SCA resistant in several world regions ( 26 , 40 ), is a major contributor to the pedigrees of many SCA-resistant breeding lines in the United States ( Fig. 6B ) ( 41 ). The same progenitor line (IS 12610) was used by breeding programs in West Africa ( Fig.…”

Section: Discussionmentioning

confidence: 99%

The recent evolutionary rescue of a staple crop depended on over half a century of global germplasm exchange

et al. 2022

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Rapid environmental change can lead to population extinction or evolutionary rescue. The global staple crop sorghum ( Sorghum bicolor ) has recently been threatened by a global outbreak of an aggressive new biotype of sugarcane aphid (SCA; Melanaphis sacchari ). We characterized genomic signatures of adaptation in a Haitian breeding population that had rapidly adapted to SCA infestation, conducting evolutionary population genomics analyses on 296 Haitian lines versus 767 global accessions. Genome scans and geographic analyses suggest that SCA adaptation has been conferred by a globally rare East African allele of RMES1 , which spread to breeding programs in Africa, Asia, and the Americas. De novo genome sequencing revealed potential causative variants at RMES1 . Markers developed from the RMES1 sweep predicted resistance in eight independent commercial and public breeding programs. These findings demonstrate the value of evolutionary genomics to develop adaptive trait technology and highlight the benefits of global germplasm exchange to facilitate evolutionary rescue.

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Section: Discussionmentioning

confidence: 99%

The recent evolutionary rescue of a staple crop depended on over half a century of global germplasm exchange

et al. 2022

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“…For example, SC110, a converted version of an Ethiopia caudatum landrace (PI 257599/IS 12610), was identified as SCA resistant in several world regions ( 23, 35 ) and is a major contributor to the pedigrees of most SCA-resistant breeding lines in the US (Fig. 6B) ( 36 ). The same progenitor line (IS 12610) was used by breeding programs in West Africa (Fig.…”

Section: Discussionmentioning

confidence: 99%

The recent evolutionary rescue of a staple crop depended on over half a century of global germplasm exchange

Felderhoff

Winans

et al. 2021

Preprint

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Rapid environmental change can lead to extinction of populations or evolutionary rescue via genetic adaptation. In the past several years, smallholder and commercial cultivation of sorghum (Sorghum bicolor), a global cereal and forage crop, has been threatened by a global outbreak of an aggressive new biotype of sugarcane aphid (SCA; Melanaphis sacchari). Here we characterized genomic signatures of adaptation in a Haitian sorghum breeding population, which had been recently founded from admixed global germplasm, extensively intercrossed, and subjected to intense selection under SCA infestation. We conducted evolutionary population genomics analyses of 296 post-selection Haitian lines compared to 767 global accessions at 159,683 single nucleotide polymorphisms. Despite intense selection, the Haitian population retains high nucleotide diversity through much of the genome due to diverse founders and an intercrossing strategy. A genome-wide fixation (FST) scan and geographic analyses suggests that adaptation to SCA in the Haiti is conferred by a globally-rare East African allele of RMES1, which has also spread to breeding programs in Africa, Asia, and the Americas. De novo genome sequencing data for SCA resistant and susceptible lines revealed putative causative variants at RMES1. Convenient low-cost markers were developed from the RMES1 selective sweep and successfully predicted resistance in independent U.S. x African breeding lines and eight U.S. commercial and public breeding programs, demonstrating the global relevance of the findings. Together, the findings highlight the potential of evolutionary genomics to develop adaptive trait breeding technology and the value of global germplasm exchange to facilitate evolutionary rescue.

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“…Host plant resistance plays a signi cant role in reducing sugarcane aphid population dynamics and can reduce plant damage and yield loss compared to susceptible hybrids 14,17 . Despite many sorghum inbred lines that have been identi ed to be resistant to sugarcane aphids 11,[18][19][20][21][22] , very few resistance genes have been identi ed. A single dominant nuclear resistance locus named RMES1 (Resistance to Melanaphis sacchari 1) on SBI-06 was associated with sugarcane aphid resistance 23 .…”

Section: Introductionmentioning

confidence: 99%

Genome-Wide Association Mapping of Resistance to the Sugarcane Aphid in Sorghum bicolor

Punnuri

Ayele

Harris‐Shultz

et al. 2021

Preprint

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Since 2013, the sugarcane aphid (SCA), Melanaphis sacchari (Zehntner), has been a serious pest that hampers all types of sorghum production in the U.S. Our understanding of sugarcane aphid resistance in sorghum is limited to knowledge about a few genetic regions on chromosome SBI-06. In this study, a subset of the Sorghum Association Panel (SAP) was used along with some additional lines to identify genetic and genomic regions that confer sugarcane aphid resistance. SAP lines were grown in the field and visually evaluated for SCA resistance during the growing seasons of 2019 and 2020 in Tifton, GA. In 2020, the SAP accessions were also evaluated for SCA resistance in the field using drone-based high throughput phenotyping (HTP) and visual scoring under greenhouse conditions. Plant height and flowering time were also recorded in the field to confirm that our methods were sufficient for identifying known quantitative trait loci (QTL). This study combined phenotypic data from field-based visual ratings, reflectance data, and greenhouse evaluations to identify genome-wide associated (GWAS) marker-trait associations (MTA) using genotyping-by-sequencing (GBS) data. Several MTAs were identified for sugarcane aphid-related traits across the genome, with a few common markers that were consistently identified on SBI-08 and SBI-10 for aphid count and plant damage as well as for reflectance indices-based traits on SBI-02, SBI-03, and SBI-05. Candidate genes encoding leucine-rich repeats (LRR), Avr proteins, lipoxygenases (LOXs), calmodulins (CAM) dependent protein kinase, WRKY transcription factors, flavonoid biosynthesis genes, and 12-oxo-phytodienoic acid reductase are identified near SNPs that had significant associations with different SCA traits. In this study, plant height and flowering time-related genes were also identified. The total phenotypic variation explained by significant SNPs across SCA-scored traits, plant height, and flowering time ranged from 0 to 74%, while the heritability value ranged from 4 to 74%. These results supported the existing literature, and also revealed several new loci. Markers identified in this study will support marker-assisted breeding for sugarcane aphid resistance.

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Registration of RTx3410 through RTx3428 Sorghum Germplasm Resistant to Sugarcane Aphid [Melanaphis sacchari (Zehntner)]

Cited by 19 publications

References 17 publications

The recent evolutionary rescue of a staple crop depended on over half a century of global germplasm exchange

The recent evolutionary rescue of a staple crop depended on over half a century of global germplasm exchange

The recent evolutionary rescue of a staple crop depended on over half a century of global germplasm exchange

Genome-Wide Association Mapping of Resistance to the Sugarcane Aphid in Sorghum bicolor

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