Apple

Brown, Susan K.

doi:10.1007/978-1-4419-0763-9_10

Cited by 52 publications

(33 citation statements)

References 186 publications

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“…Change in firmness after storage measurements were significantly correlated across years ( r = 0.614, p = 1.548 × 10 ‐14 ), but the absence of a GWAS peak in 2014 that was clearly present in 2013 together with a dramatic difference in genomic prediction accuracies for this trait between years highlight the sensitivity of this type of analysis to between‐year variation. Replicating phenotype measurements across clonal trees in addition to collecting composite fruit samples likely would have better captured phenotype variability in the CET population (Brown, 2012), but was cost prohibitive. Attempts here to provide post‐hoc explanations for the observed discrepancies in GWAS results between years highlight the importance of consistent data collection in single location, multi‐year trials.…”

Section: Discussionmentioning

confidence: 99%

A Genome‐Wide Association Study of Apple Quality and Scab Resistance

McClure¹,

Gardner

Douglas³

et al. 2018

The Plant Genome

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The apple (Malus × domestica Borkh.) is an economically and culturally important crop grown worldwide. Growers of this long-lived perennial must produce fruit of adequate quality while also combatting abiotic and biotic stress. Traditional apple breeding can take up to 20 yr from initial cross to commercial release, but genomics-assisted breeding can help accelerate this process. To advance genomics-assisted breeding in apple, we performed genome-wide association studies (GWAS) and genomic prediction in a collection of 172 apple accessions by linking over 55,000 single nucleotide polymorphisms (SNPs) with 10 phenotypes collected over 2 yr. Genomewide association studies revealed several known loci for skin color, harvest date and firmness at harvest. Several significant GWAS associations were detected for resistance to a major fungal pathogen, apple scab (Venturia ineaqualis [Cke.] Wint.), but we demonstrate that these hits likely represent a single ancestral source. Using genomic prediction, we show that most phenotypes are sufficiently predictable using genome-wide SNPs to be candidates for genomic selection. Finally, we detect a signal for firmness retention after storage on chromosome 10 and show that it may not stem from variation in PG1, a gene repeatedly identified in bi-parental mapping studies and widely believed to underlie a major QTL for firmness on chromosome 10. We provide evidence that this major QTL is more likely due to variation in a neighboring ethylene response factor (ERF) gene. The present study showcases the superior mapping resolution of GWAS compared to bi-parental linkage mapping by identifying a novel candidate gene underlying a well-studied, major QTL involved in apple firmness.

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Section: Discussionmentioning

confidence: 99%

A Genome‐Wide Association Study of Apple Quality and Scab Resistance

McClure¹,

Gardner

Douglas³

et al. 2018

The Plant Genome

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“…According to Brown (2012), apples are the most produced temperate tree crop, and they are widely grown throughout almost the entire temperate climate region in the Northern and Southern hemispheres. Recently, apple cropping has been expanding into subtropical and tropical zones (Karakurt and Aslantas, 2010).…”

Section: Introductionmentioning

confidence: 99%

Cultivable bacteria isolated from apple trees cultivated under different crop systems: Diversity and antagonistic activity against Colletotrichum gloeosporioides

Passos

Costa

et al. 2014

Genet. Mol. Biol.

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This study evaluated the diversity of cultivable plant growth-promoting (PGP) bacteria associated with apple trees cultivated under different crop management systems and their antagonistic ability against Colletotrichum gloeosporioides. Samples of roots and rhizospheric soil from apple trees cultivated in organic and conventional orchards in southern Brazil were collected, together with soil samples from an area never used for agriculture (native field). Bacteria were identified at the genus level by PCR-RFLP and partial sequencing of the 16S rRNA, and were evaluated for some PGP abilities. The most abundant bacterial genera identified were Enterobacter (27.7%), Pseudomonas (18.7%), Burkholderia (13.7%), and Rahnella (12.3%). Sixty-nine isolates presented some antagonist activity against C. gloeosporioides. In a greenhouse experiment, five days after exposure to C. gloeosporioides, an average of 30% of the leaf area of plants inoculated with isolate 89 (identified as Burkholderia sp.) were infected, whereas 60 to 73% of the leaf area of untreated plants was affected by fungal attack. Our results allowed us to infer how anthropogenic activity is affecting the bacterial communities in soil associated with apple tree crop systems, and to obtain an isolate that was able to delay the emergence of an important disease for this culture.

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“…produced fruits in temperate climate areas and is expanding into subtropical and tropical areas (Brown, 2012). However, recent global climate changes manifested in rising temperatures and late frosts in the flowering season caused poorer coloring of apple fruit skin and frost damage to pistils (Sugiura et al, 2007).…”

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confidence: 99%