‘IAC SEMPRE VERDE’: a wild-derived peanut cultivar highly resistant to foliar diseases

Godoy, Ignácio José de; Santos, João Francisco dos; Moretzsohn, Márcio de Carvalho; Moraes, Andrea Rocha Almeida de; Michelotto, Marcos Doniseti; Bolonhezi, Denizart; Nakayama, Fernando Takayuki; Freitas, Rogério Soares de; Bertioli, David J.; Leal-Bertioli, S. C. de M.

doi:10.1590/1984-70332022v22n3c25

Cited by 2 publications

(3 citation statements)

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“…Among these lines, 31 were highly resistant to LLS and productive under unsprayed fungicide conditions, and 5 of them showed resistance and production (considering the production of individual plants) similar to or higher than ‘IAC Sempre Verde’. This cultivar was released in Brazil in 2019 and incorporates very strong LLS and rust resistance ( Godoy et al., 2022 ). Under cultivation without fungicide control of foliar diseases, it produces 5,000 kg ha −1 .…”

Section: Discussionmentioning

confidence: 99%

“…By using marker-assisted selection, segments conferring RKN resistance were introgressed into released peanut cultivars ( Chu et al., 2011 ; Simpson et al., 2013 ; Clevenger et al., 2017b ). In addition, both by anonymous phenotypic and by marker selection, A. cardenasii -containing segments that confer resistance to leaf spots and rust have been introgressed into peanut in breeding programs worldwide ( Varshney et al., 2014 ; Shasidhar et al., 2020 ; Godoy et al., 2022 ; Holbrook et al., 2022 ). The very large-scale anonymous contribution of A. cardenasii to the peanut crop was recently shown with high-throughput genotyping; 251 peanut lines and cultivars in 30 countries were found to have genetics from this wild species; in almost all cases, the breeders involved were unaware of the wild genetics ( Bertioli et al., 2021a ).…”

Section: Introductionmentioning

confidence: 99%

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Marker-assisted introgression of wild chromosome segments conferring resistance to fungal foliar diseases into peanut (Arachis hypogaea L.)

et al. 2023

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IntroductionFungal foliar diseases can severely affect the productivity of the peanut crop worldwide. Late leaf spot is the most frequent disease and a major problem of the crop in Brazil and many other tropical countries. Only partial resistance to fungal diseases has been found in cultivated peanut, but high resistances have been described on the secondary gene pool.MethodsTo overcome the known compatibility barriers for the use of wild species in peanut breeding programs, we used an induced allotetraploid (Arachis stenosperma × A. magna)4x, as a donor parent, in a successive backcrossing scheme with the high-yielding Brazilian cultivar IAC OL 4. We used microsatellite markers associated with late leaf spot and rust resistance for foreground selection and high-throughput SNP genotyping for background selection.ResultsWith these tools, we developed agronomically adapted lines with high cultivated genome recovery, high-yield potential, and wild chromosome segments from both A. stenosperma and A. magna conferring high resistance to late leaf spot and rust. These segments include the four previously identified as having QTLs (quantitative trait loci) for resistance to both diseases, which could be confirmed here, and at least four additional QTLs identified by using mapping populations on four generations.DiscussionThe introgression germplasm developed here will extend the useful genetic diversity of the primary gene pool by providing novel wild resistance genes against these two destructive peanut diseases.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Marker-assisted introgression of wild chromosome segments conferring resistance to fungal foliar diseases into peanut (Arachis hypogaea L.)

et al. 2023

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“…This line has been used as the source of resistance to several populations, including the peanut nested association mapping (NAM) population [88]. Other leaf spot-resistant cultivars derived from the A. cardenasii resistance source are the Indian cultivars ICGV 87165 [89] and GPBD 4 [9,90], as well as the Brazilian cultivar IAC Sempre Verde [91].…”

Section: Discussionmentioning

confidence: 99%

High-Throughput Canopy and Belowground Phenotyping of a Set of Peanut CSSLs Detects Lines with Increased Pod Weight and Foliar Disease Tolerance

et al. 2023

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We deployed field-based high-throughput phenotyping (HTP) techniques to acquire trait data for a subset of a peanut chromosome segment substitution line (CSSL) population. Sensors mounted on an unmanned aerial vehicle (UAV) were used to derive various vegetative indices as well as canopy temperatures. A combination of aerial imaging and manual scoring showed that CSSL 100, CSSL 84, CSSL 111, and CSSL 15 had remarkably low tomato spotted wilt virus (TSWV) incidence, a devastating disease in South Georgia, USA. The four lines also performed well under leaf spot pressure. The vegetative indices showed strong correlations of up to 0.94 with visual disease scores, indicating that aerial phenotyping is a reliable way of selecting under disease pressure. Since the yield components of peanut are below the soil surface, we deployed ground penetrating radar (GPR) technology to detect pods non-destructively. Moderate correlations of up to 0.5 between pod weight and data acquired from GPR signals were observed. Both the manually acquired pod data and GPR variables highlighted the three lines, CSSL 84, CSSL 100, and CSSL 111, as the best-performing lines, with pod weights comparable to the cultivated check Tifguard. Through the combined application of manual and HTP techniques, this study reinforces the premise that chromosome segments from peanut wild relatives may be a potential source of valuable agronomic traits.

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‘IAC SEMPRE VERDE’: a wild-derived peanut cultivar highly resistant to foliar diseases

Cited by 2 publications

References 9 publications

Marker-assisted introgression of wild chromosome segments conferring resistance to fungal foliar diseases into peanut (Arachis hypogaea L.)

Marker-assisted introgression of wild chromosome segments conferring resistance to fungal foliar diseases into peanut (Arachis hypogaea L.)

High-Throughput Canopy and Belowground Phenotyping of a Set of Peanut CSSLs Detects Lines with Increased Pod Weight and Foliar Disease Tolerance

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