Screening of cultivated and wild<i>Helianthus</i>species reveals herbicide tolerance in wild sunflowers and allelic variation at<i>Ahasl1</i>(acetohydroxyacid synthase 1 large subunit) locus

Jacob, Jinu; Sujatha, M.; Varaprasad, Sivannarayana Kodeboyina

doi:10.1017/s1479262116000095

Cited by 9 publications

(8 citation statements)

References 34 publications

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“…Additionally, imidazolinone may control broomrape in areas of the world where this parasitic weed attacks sunflower (Alonso et al, 1998). Recently, Jacob et al (2016) reported that Helianthus praecox Engelm. & A.…”

Section: Biotic Traitsmentioning

confidence: 99%

Utilization of Sunflower Crop Wild Relatives for Cultivated Sunflower Improvement

2017

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Sunflower (Helianthus annuus L.) is one of the few crops native to the United States. The current USDA–ARS National Plant Germplasm System (NPGS) crop wild relatives sunflower collection is the largest extant collection in the world, containing 2519 accessions comprising 53 species—39 perennial and 14 annual. To fully utilize gene bank collections, however, researchers need more detailed information about the amount and distribution of genetic diversity present within the collection. The wild species are adapted to a wide range of habitats and possess considerable variability for most biotic and abiotic traits. This represents a substantial amount of genetic diversity available for many agronomic traits for cultivated sunflower, which has a very narrow genetic base. Sunflower ranked fifth highest among 13 crops of major importance to global food security surveyed from the mid‐1980s to 2005 in the use of traits from crop wild relatives. The estimated annual economic contribution of the wild species for cultivated sunflower is between US$267 to 384 million. Most of the value is derived from the PET1 cytoplasm from wild H. petiolaris, disease resistance genes, abiotic salt tolerance, and resistance to imidazolinone and sulfonylurea herbicides. Crop wild relatives provide a wide range of valuable attributes for traditional and molecular breeding, as well as for ecological experimentation, and have enabled rapid advances in ecological and evolutionary genetics. The wild species of Helianthus continue to contribute specific traits to combat emerging pests and environmental challenges and, at the same time, are preserved for future generations.

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Section: Biotic Traitsmentioning

confidence: 99%

Utilization of Sunflower Crop Wild Relatives for Cultivated Sunflower Improvement

2017

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“…The same tolerance was also obtained by EMS mutagenesis ( Gabard and Huby, 2001 ). Later, more populations of wild sunflowers resistant to AHAS herbicides were found (e.g., White et al, 2002 , 2003 ; Jacob et al, 2017 ). In addition, a new tolerance for imidazoline called Clearfield Plus ® was selected from an M2 population of 600,000 plants treated with EMS ( Sala et al, 2008a ).…”

Section: Plant Genetic Resources In Sunflowermentioning

confidence: 99%

Sunflower Hybrid Breeding: From Markers to Genomic Selection

Dimitrijević

Horn

2018

Front. Plant Sci.

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In sunflower, molecular markers for simple traits as, e.g., fertility restoration, high oleic acid content, herbicide tolerance or resistances to Plasmopara halstedii, Puccinia helianthi, or Orobanche cumana have been successfully used in marker-assisted breeding programs for years. However, agronomically important complex quantitative traits like yield, heterosis, drought tolerance, oil content or selection for disease resistance, e.g., against Sclerotinia sclerotiorum have been challenging and will require genome-wide approaches. Plant genetic resources for sunflower are being collected and conserved worldwide that represent valuable resources to study complex traits. Sunflower association panels provide the basis for genome-wide association studies, overcoming disadvantages of biparental populations. Advances in technologies and the availability of the sunflower genome sequence made novel approaches on the whole genome level possible. Genotype-by-sequencing, and whole genome sequencing based on next generation sequencing technologies facilitated the production of large amounts of SNP markers for high density maps as well as SNP arrays and allowed genome-wide association studies and genomic selection in sunflower. Genome wide or candidate gene based association studies have been performed for traits like branching, flowering time, resistance to Sclerotinia head and stalk rot. First steps in genomic selection with regard to hybrid performance and hybrid oil content have shown that genomic selection can successfully address complex quantitative traits in sunflower and will help to speed up sunflower breeding programs in the future. To make sunflower more competitive toward other oil crops higher levels of resistance against pathogens and better yield performance are required. In addition, optimizing plant architecture toward a more complex growth type for higher plant densities has the potential to considerably increase yields per hectare. Integrative approaches combining omic technologies (genomics, transcriptomics, proteomics, metabolomics and phenomics) using bioinformatic tools will facilitate the identification of target genes and markers for complex traits and will give a better insight into the mechanisms behind the traits.

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“…The trait of most economical value to date is the CMS ( PET1 ) introgressed from the wild species H. petiolaris , which, along with restorer genes also incorporated from wild species, is responsible for the success of the sunflower hybrid seed industry. Dozens of examples of introgression of important traits have been published, and these include herbicide tolerance (Jacob et al, 2016) and disease and insect resistance, including disease resistance genes for rust (Chandler et al, 1986), downy mildew [ Plasmopara halstedii (Farl.) Berl.…”

Section: Case 1: Sunflowersmentioning

confidence: 99%

The Use of Crop Wild Relatives in Maize and Sunflower Breeding

et al. 2017

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Conservation of crop wild relatives (CWR) has always been predicated on the promise of new and useful traits, and thus modern genetics and genomics tools must help fulfill the promise and continue to secure the conservation of these resources. However, the vast genetic potential present in CWR is often difficult to tap, as identification of superior alleles can be hampered by the effects of the environment on expression of these alleles and masked in different genetic backgrounds; transfer of superior alleles into breeding pools to create new crop varieties can be slow and expensive. Some crop species have been more amenable to introgression of traits from wild relatives than others. In some cases, these species may be less diverged from their wild ancestors, which become a good source of mono‐ to oligogenic traits, many of which are more qualitative in nature, and sometimes of quantitative traits. Sunflower (Helianthus annuus L.) is an introgression success story, and many traits, including cytoplasmic male sterility, herbicide tolerance, drought and biotic stress resistance, and modified fatty acid profiles, have been introgressed into the cultivated gene pool from wild relatives without depression of oil yield and quality. Others, including maize (Zea mays L.), have shown little progress in widening the cultivated gene pool using exotic sources due to temporary yield depression, potential for loss of quality, and disturbance of current logistical habits. Here, we review the breeding history of sunflower and maize and explore variables that have limited the use of CWR in some species and allowed success in others. Surprisingly, in both sunflower and maize, biological limitations are similar and smaller than expected and appear to be surmountable with sufficient determination. Possible new technologies and policies to allow a deeper mining of these genetic resources in all crop species are discussed.

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Screening of cultivated and wildHelianthusspecies reveals herbicide tolerance in wild sunflowers and allelic variation atAhasl1(acetohydroxyacid synthase 1 large subunit) locus

Cited by 9 publications

References 34 publications

Utilization of Sunflower Crop Wild Relatives for Cultivated Sunflower Improvement

Utilization of Sunflower Crop Wild Relatives for Cultivated Sunflower Improvement

Sunflower Hybrid Breeding: From Markers to Genomic Selection

The Use of Crop Wild Relatives in Maize and Sunflower Breeding

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