Late Leaf Spot Progression on Peanut as Affected by Components of Partial Resistance

Aquino, Vermando M.; Shokes, F. M.; Gorbet, D. W.; Nutter, Forrest W.

doi:10.1094/pd-79-0074

Cited by 24 publications

(19 citation statements)

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“…These six mini core accessions can therefore be considered for infusing resistance for LLS and rust diseases in peanut. Detailed investigations should also be further carried out to determine the resistance levels of these accessions towards different components such as incubation period, latent period, sporulation, lesion size, plant appearance score and per cent necrotic area (Aquino et al 1995). It has been reported that several components have been shown to negatively impact the rate of disease progression under field conditions (Foster et al 1980;Ricker et al 1985).…”

Section: Discussionmentioning

confidence: 99%

“…The most recent reports on rust and LLS resistant genotypes date back to Cook (1972), Porter et al (1982; Subrahmanyam et al (1980Subrahmanyam et al ( , 1989. Similarly, several studies reported the rate-reducing resistance as a viable strategy for identifying improved resistance to LLS (Aquino et al 1995;Abdou et al 1974;Chiteka et al 1988;Gorbet et al 1990;Kornegay et al 1980;Pixeley et al 1990). However, for precise identification of resistant sources, knowledge on components and mechanisms of resistance are the prerequisites for successful breeding programs.…”

Section: Introductionmentioning

confidence: 99%

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Resistance to late leaf spot and rust diseases in ICRISAT’s mini core collection of peanut (Arachis hypogaea L.)

Sudini

Upadhyaya

Reddy

et al. 2015

Australasian Plant Pathol.

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Late leaf spot (LLS) (Phaeoisariopsis personata) and rust (Puccinia arachidis) are major foliar diseases of peanut causing significant losses worldwide. Identification and infusion of resistance into peanut cultivars is important in the management of these diseases. The present study therefore aimed at screening the peanut mini core collection to identify potential sources of resistance to these diseases. Two separate field experiments were conducted for screening LLS and rust under artificial epiphytotic conditions during rainy seasons of 2012 and 2013 at ICRISAT, Patancheru, India. The trials were laid in a randomized complete block design on beds with three replications. Data on LLS and rust disease severities were collected using 1 to 9 scales at 75, 90 and 105 days after sowing (DAS), and pod yields were recorded at harvest. Results indicate significant variations among accessions for LLS and rust resistance. Mean of 2 years study revealed that 53 accessions were moderately resistant (MR), 86 accessions were susceptible (S) and 45 accessions were highly susceptible (HS) to LLS. For rust disease, 10 accessions were resistant (R), 115 accessions were with 'MR' reaction and 59 accessions with susceptible (S) reaction. Six superior accessions in terms of combined disease resistance and yield (ICGs 4389, 6993, 11426, 4746, 6022, 11088) were selected and the disease progress curves, for each, were generated. Highest yields were recorded with ICG 11426 in LLS and rust plots. Overall, our results indicate that these six accessions can be potential sources of LLS and rust resistance.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Resistance to late leaf spot and rust diseases in ICRISAT’s mini core collection of peanut (Arachis hypogaea L.)

Sudini

Upadhyaya

Reddy

et al. 2015

Australasian Plant Pathol.

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“…29 (6) (Luo et al, 1997) e amendoim (Arachis hypogaea L.) -Cercosporidium personatum (Berk. & Curtis) Deighton (Aquino et al, 1995). Em trigo (Triticum aestivum L.)-Septoria nodorum Berk.…”

Section: Discussionmentioning

confidence: 99%

Componentes de resistência em cebola a Colletotrichum gloeosporioides

et al. 2004

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A antracnose foliar causada por Colletotrichum gloeosporioides é importante nas regiões cebolicultoras da América Latina, África e Ásia, mas há poucos estudos relacionados à resistência ao patógeno. Assim, neste trabalho, conduzido em condições de casa de vegetação, avaliaram-se componentes de resistência de oito cultivares e dois acessos de cebola (Allium cepa) a quatro isolados do patógeno, inoculados por atomização de suspensão de inóculo ou deposição de discos de micélio em folhas. Detectaram-se diferenças significativas entre cultivares/acessos, na inoculação por atomização, quanto à freqüência de infecção inicial e à taxa de progresso monocíclico da doença (r g) e, na inoculação com disco de micélio, quanto ao período de incubação e área da lesão. Determinaram-se os coeficientes de correlação (r) dos componentes de resistência estimados na inoculação por atomização. Os valores de r foram 0,98 entre severidade estimada visualmente aos nove dias da inoculação (SEV9) e área abaixo da curva de progresso da doença (AACPD); 0,80 entre SEV9 e severidade estimada por medidor de área foliar (SEV); 0,72 entre SEV9 e r g; 0,64 entre SEV9 e freqüência de infecção aos nove dias da inoculação; 0,81 entre SEV e AACPD e 0,64 entre SEV e r g. Em vista dos valores significativos de r associados a SEV9 e da não necessidade de escala para estimar esse componente, SEV9 é potencialmente útil na avaliação de germoplasma de cebola frente a C. gloeosporioides. Na inoculação por atomização, mais rápida e simples de execução, obtiveram-se maior eficiência de infecção e menor variabilidade de respostas, e deverá ser adotada em estudos futuros.

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“…Some have argued that as yield is the primary objective in any resistance program, selection based on defoliation would probably be the most appropriate due to its high heritability and the fact that reductions in yield are attributed in large part to premature defoliation in diseased fields (Anderson et al 1991). Reports by Aquino et al (1995) suggested that latency period and maximum percentage of lesions that sporulated were the components of resistance most highly correlated with late leaf spot disease development and suggested that using either component may facilitate more rapid selection of lines with improved levels of rate-reducing resistance in germplasm evaluations. Wynne and Halward (1989) and Simpson (1991) suggested multigenic type resistance for the two leaf spot diseases with a strong possibility of each under the control of two or more genes.…”

Section: Breedingmentioning

confidence: 99%

Marker‐Assisted Selection for Biotic Stress Resistance in Peanut

Burow¹,

Leal‐Bertioli²,

Simpson³

et al. 2013

Translational Genomics for Crop Breeding

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Peanut is the second-most important legum e grown worldwide. Cultivated peanut is a disomic tetraploid, 2n-4 x -40, with limited genetic diversity due to a genetic bottleneck in formation o f the polyploid from ancestors A. duranensis and A. ipaensis. Consequently, resistance_to biotic stresses is limited in the cultigen; however, w ild species possess strong resistances. Transfer o f these re sistances is hindered by differences o f ploidy, but production o f synthetic amphidiploids, coupled with use o f m olecular markers, enables efficient gene transfer. Marker maps have been made from interspecific crosses, and SSR-based maps from cultivated parents have been developed recently. At least 410 resistance gene analogues have been identified. The first markers for biotic stress tolerance were for root-knot nematode resistance and introgressed from one A. cardenasii chromosome. These and improved markers have been used for marker-assisted backcrossing, contributing to release o f three cultivars. Additional QTLs have been identified since.Early and late leafspots cause significant yield losses worldwide, and resistance depends on multiple genes. U sing interspecific populations, five resistance QTLs for early leafspot were identified using greenhouse inoculations, and five QTLs for late leafspot were identified using detached leaf assays. U sing cultivated species populations, 28 QTLs were identified for LLS resistance; all but one w ere minor QTLs; the major QTL was donated by an interspecific introgression line parent. Rust often occurs alongside leafspots, and rust resistance was characterized as one major QTL, plus several smaller QTLs. Marker-assisted backcrossing o f this major QTL has been performed into different populations. QTLs for resistance to other biotic stresses have been identified, namely to groundnut rosette virus, Sclerotinia blight, afiatoxin contamination, aphids, and tomato spotted w ilt virus. Marker-assisted breeding is still in early stages, and develop ment o f more rapid and inexpensive markers from transcriptome and genom e sequencing is expected to accelerate progress.

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Late Leaf Spot Progression on Peanut as Affected by Components of Partial Resistance

Cited by 24 publications

References 0 publications

Resistance to late leaf spot and rust diseases in ICRISAT’s mini core collection of peanut (Arachis hypogaea L.)

Resistance to late leaf spot and rust diseases in ICRISAT’s mini core collection of peanut (Arachis hypogaea L.)

Componentes de resistência em cebola a Colletotrichum gloeosporioides

Marker‐Assisted Selection for Biotic Stress Resistance in Peanut

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