@article{levinson_bertioli_chu_hopkins_leal-bertioli_stalker_gao_ozias-akins_2021, title={Development and applications of KASP markers distinguishing A- and B/K-genomes of Arachis}, volume={217}, ISSN={["1573-5060"]}, DOI={10.1007/s10681-021-02923-8}, number={10}, journal={EUPHYTICA}, author={Levinson, Chandler M. and Bertioli, David and Chu, Ye and Hopkins, Mark and Leal-Bertioli, Soraya C. M. and Stalker, H. Thomas and Gao, Dongying and Ozias-Akins, Peggy}, year={2021}, month={Oct} }
 @misc{stalker_warburton_harlan_2021, title={Harlan's Crops and Man}, ISBN={9780891186335 9780891186342}, ISSN={2691-2341}, url={http://dx.doi.org/10.1002/9780891186342}, DOI={10.1002/9780891186342}, journal={ASA, CSSA, and SSSA Books}, publisher={Wiley}, author={Stalker, H. Thomas and Warburton, Marilyn L. and Harlan, Jack R.}, year={2021}, month={Mar} }
 @article{chu_bertioli_levinson_stalker_holbrook_ozias-akins_2021, title={Homoeologous recombination is recurrent in the nascent synthetic allotetraploid Arachis ipaensis x Arachis correntina(4x) and its derivatives}, volume={11}, ISSN={["2160-1836"]}, DOI={10.1093/g3journal/jkab066}, abstractNote={Abstract Genome instability in newly synthesized allotetraploids of peanut has breeding implications that have not been fully appreciated. Synthesis of wild species-derived neo-tetraploids offers the opportunity to broaden the gene pool of peanut; however, the dynamics among the newly merged genomes creates predictable and unpredictable variation. Selfed progenies from the neo-tetraploid Arachis ipaënsis × Arachis correntina (A. ipaënsis × A. correntina)4x and F1 hybrids and F2 progenies from crosses between A. hypogaea × [A. ipaënsis × A. correntina]4x were genotyped by the Axiom Arachis 48 K SNP array. Homoeologous recombination between the A. ipaënsis and A. correntina derived subgenomes was observed in the S0 generation. Among the S1 progenies, these recombined segments segregated and new events of homoeologous recombination emerged. The genomic regions undergoing homoeologous recombination segregated mostly disomically in the F2 progenies from A. hypogaea × [A. ipaënsis × A. correntina]4x crosses. New homoeologous recombination events also occurred in the F2 population, mostly found on chromosomes 03, 04, 05, and 06. From the breeding perspective, these phenomena offer both possibilities and perils; recombination between genomes increases genetic diversity, but genome instability could lead to instability of traits or even loss of viability within lineages.}, number={4}, journal={G3-GENES GENOMES GENETICS}, author={Chu, Ye and Bertioli, David and Levinson, Chandler M. and Stalker, H. Thomas and Holbrook, C. Corley and Ozias-Akins, Peggy}, year={2021}, month={Apr} }
 @article{bertioli_clevenger_godoy_stalker_wood_santos_ballen-taborda_abernathy_azevedo_campbell_et al._2021, title={Legacy genetics of Arachis cardenasii in the peanut crop shows the profound benefits of international seed exchange}, volume={118}, ISSN={["0027-8424"]}, DOI={10.1073/pnas.2104899118}, abstractNote={Significance A great challenge for humanity is feeding its growing population while minimizing ecosystem damage and climate change. Here, we uncover the global benefits arising from the introduction of one wild species accession to peanut-breeding programs decades ago. This work emphasizes the importance of biodiversity to crop improvement: peanut cultivars with genetics from this wild accession provided improved food security and reduced use of fungicide sprays. However, this study also highlights the perilous consequences of changes in legal frameworks and attitudes concerning biodiversity. These changes have greatly reduced the botanical collections, seed exchanges, and international collaborations which are essential for the continued diversification of crop genetics and, consequently, the long-term resilience of crops against evolving pests and pathogens and changing climate. The narrow genetics of most crops is a fundamental vulnerability to food security. This makes wild crop relatives a strategic resource of genetic diversity that can be used for crop improvement and adaptation to new agricultural challenges. Here, we uncover the contribution of one wild species accession, Arachis cardenasii GKP 10017, to the peanut crop (Arachis hypogaea) that was initiated by complex hybridizations in the 1960s and propagated by international seed exchange. However, until this study, the global scale of the dispersal of genetic contributions from this wild accession had been obscured by the multiple germplasm transfers, breeding cycles, and unrecorded genetic mixing between lineages that had occurred over the years. By genetic analysis and pedigree research, we identified A. cardenasii–enhanced, disease-resistant cultivars in Africa, Asia, Oceania, and the Americas. These cultivars provide widespread improved food security and environmental and economic benefits. This study emphasizes the importance of wild species and collaborative networks of international expertise for crop improvement. However, it also highlights the consequences of the implementation of a patchwork of restrictive national laws and sea changes in attitudes regarding germplasm that followed in the wake of the Convention on Biological Diversity. Today, the botanical collections and multiple seed exchanges which enable benefits such as those revealed by this study are drastically reduced. The research reported here underscores the vital importance of ready access to germplasm in ensuring long-term world food security.}, number={38}, journal={PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA}, author={Bertioli, David J. and Clevenger, Josh and Godoy, Ignacio J. and Stalker, H. T. and Wood, Shona and Santos, Joao F. and Ballen-Taborda, Carolina and Abernathy, Brian and Azevedo, Vania and Campbell, Jacqueline and et al.}, year={2021}, month={Sep} }
 @article{levinson_chu_luo_stalker_gao_holbrook_ozias-akins_2021, title={Morphological and reproductive characterization of nascent allotetraploids cross-compatible with cultivated peanut (Arachis hypogaea L.)}, volume={68}, ISSN={["1573-5109"]}, DOI={10.1007/s10722-021-01161-0}, abstractNote={Abstract Peanut improvement is limited by a narrow genetic base. However, this obstacle can be circumvented by incorporating phenotypic variability from wild, diploid Arachis species through interspecific hybridizations. In this study, four allotetraploid interspecific hybrids IpaCor 4 x ( A. ipaensis × A. correntina ) , IpaDur 4 x ( A. ipaensis × A. duranensis ), IpaSten 4 x ( A. ipaensis × A. stenosperma ) , and ValSten 4 x ( A. valida × A. stenosperma ) were created and morphologically characterized through the following parameters: flower count, flower size, flower banner pigmentation, leaf area and weight, leaf hairiness, main stem height, internode length, percent of reproductive nodes, biomass, 100 pod weight, and 100 seed weight. For every trait, except for flower banner absorption at 380 nm, at least one or more allotetraploids differed from the cultivated peanut control. In general, these allotetraploids had a greater production of flowers during the growing season, larger flowers, larger and hairier leaves, taller main stems, longer primary laterals, longer internodes, lower percentage of reproductive nodes, heavier plant body masses, and smaller seeds and pods. This phenotypic diversity can be utilized directly in ornamental and forage breeding, while for oil and food crop breeding, this diversity will likely need to be selected against while desirable traits such as disease and insect resistance and abiotic stress tolerances derived from the wild diploid species are maintained.}, number={7}, journal={GENETIC RESOURCES AND CROP EVOLUTION}, author={Levinson, Chandler and Chu, Ye and Luo, Xuelin and Stalker, H. Thomas and Gao, Dongying and Holbrook, C. Corley and Ozias-Akins, Peggy}, year={2021}, month={Oct}, pages={2883–2896} }
 @article{chu_stalker_marasigan_levinson_gao_bertioli_leal-bertioli_holbrook_jackson_ozias-akins_2021, title={Registration of three peanut allotetraploid interspecific hybrids resistant to late leaf spot disease and tomato spotted wilt}, ISSN={["1940-3496"]}, DOI={10.1002/plr2.20146}, abstractNote={Abstract Cultivated peanut ( Arachis hypogaea L.) has a narrow genetic base and is isolated from its wild relatives. This genetic bottleneck results in a lack of strong resistance to biotic and abiotic stress. However, high levels of genetic variation and resistance exist among the wild relatives. In order to enlarge the genetic base of cultivated peanut and introgress beneficial alleles from the wild relatives, interspecific hybrids were produced among a set of selected diploid species. Upon colchicine treatment, fertile allotetraploids were recovered from three combinations including ( A. ipaënsis KG 30076 × A. correntina GKP 9530) 4x (Reg. no. GP‐241, PI 695391), ( A. ipaënsis KG 30076 × A. duranensis KGBSPSc 30060) 4x (Reg. no. GP‐242, PI 695392), and ( A. valida KG30011 × A. stenosperma V 10309) 4x (Reg. no. GP‐243, PI 695393). All of them demonstrated high levels of resistance to leaf spot diseases in the field. Tolerance to Tomato spotted wilt virus was found in ( A. valida KG 30011 × A. stenosperma V 10309) 4x . These newly created allotetraploids are cross‐compatible with cultivated peanut. These genetic resources will provide peanut breeding researchers with new sources of disease resistances to improve the agronomic performance of cultivated peanut.}, journal={JOURNAL OF PLANT REGISTRATIONS}, author={Chu, Ye and Stalker, H. Thomas and Marasigan, Kathleen and Levinson, Chandler M. and Gao, Dongying and Bertioli, David J. and Leal-Bertioli, Soraya C. M. and Holbrook, C. Corley and Jackson, Scott A. and Ozias-Akins, Peggy}, year={2021}, month={Aug} }
 @article{jordan_dunne_stalker_shew_brandenburg_anco_mehl_taylor_balota_2020, title={Risk to sustainability of pest management tools in peanut}, volume={5}, ISSN={["2471-9625"]}, DOI={10.1002/ael2.20018}, abstractNote={A diversity of pests can adversely affect peanut (Arachis hypogaea L.) yield, quality, and financial return. Farmers rely heavily on applied chemicals to suppress many of the economically important pests present in peanut. The effectiveness of this approach to pest management may not be sustainable, however, due to evolved resistance in pests to chemicals, reluctance of basic chemical manufacturers to invest in product development because of the relatively small market for peanut compared with other crops, cost to initially register or re‐register chemicals, and the desire for peanut buyers and processors to capture international markets that may have varying agrochemical residue restrictions for peanut. Heavy reliance on chemical control could leave peanut production systems vulnerable to yield loss; thus, a more concerted research effort is needed to increase the number and availability of nonchemical tools that protect peanut from pests in order to ensure long‐term sustainability of peanut production systems.}, number={1}, journal={AGRICULTURAL & ENVIRONMENTAL LETTERS}, author={Jordan, David L. and Dunne, Jeffrey and Stalker, H. Thomas and Shew, Barbara B. and Brandenburg, Rick L. and Anco, Dan and Mehl, Hillary and Taylor, Sally and Balota, Maria}, year={2020} }
 @article{tonnis_wang_tallury_tishchenko_stalker_2019, title={Identification of a mutant from Arachis veigae with enhanced seed oleic and very long-chain fatty acid content}, volume={62}, ISSN={["2468-0842"]}, DOI={10.1186/s13765-019-0420-x}, abstractNote={High oleate is an important seed quality trait frequently incorporated in peanut varieties. Crop wild relatives (CWR) are potentially useful genetic resources for cultivar improvement through genetic introgression; but for wild peanut species, many chemical or nutritional traits are not well characterized. A mutant from Arachis veigae S. H. Santana & Valls (2n = 2x = 20), with increased oleic and very long chain (C ≥ 22) fatty acid content was identified from screening 209 accessions of 45 species using gas chromatography (GC). The A. veigae (formerly A. sylvestris) accession, VVeSv 8373 (PI 688970) contained 55.5% oleic acid in seeds, significantly higher than the average (18.3%) of other accessions within the same species and also significantly higher than the average (37.0%) of all wild peanut accessions evaluated. A C37T substitution was identified by sequencing the coding region of FAD2H, resulting in the nonsense mutation of Q13* (a premature stop codon). This functional mutation may significantly reduce the fatty acid desaturase (FAD) activity and result in the enhanced oleate level. Arachis veigae also contained a high percentage of very long-chain (C ≥ 22) fatty acids, and their variation identified in this study is also discussed and compared with other species. The mutant with such an altered fatty acid composition may be useful for potentially improving seed or food nutrition quality.}, journal={APPLIED BIOLOGICAL CHEMISTRY}, author={Tonnis, Brandon and Wang, Ming Li and Tallury, Shyam and Tishchenko, Viktor and Stalker, H. Thomas}, year={2019}, month={Mar} }