‘WA 38’ Apple

Evans, Kate; Barritt, B. H.; Konishi, Bonnie S.; Brutcher, Lisa; Ross, Carolyn F.

doi:10.21273/hortsci.47.8.1177

Cited by 29 publications

(18 citation statements)

References 6 publications

(7 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previously reported MS to HR levels of cultivars Frostbite, Honeycrisp, Keepsake, and WA 38 might be partially explained by the presence of 6E (Table 2 ) 23 . In addition to inheriting 6E from ‘Honeycrisp’, ‘WA 38’ 41 inherited reduced-susceptibility haplotype 6N from ‘Enterprise’, which could explain ‘WA 38’s lower susceptibility classification compared to ‘Honeycrisp’ 23 . The presence of increased-susceptibility haplotype 6R, which segregated in families derived from ‘Honeycrisp’, ‘Minnewashta’, and ‘Sansa’, might partially explain the previously reported HS to MS levels of several cultivars (Table 2 ).…”

Section: Discussionmentioning

confidence: 99%

Fire blight QTL analysis in a multi-family apple population identifies a reduced-susceptibility allele in ‘Honeycrisp’

et al. 2021

Self Cite

View full text Add to dashboard Cite

Breeding apple cultivars with resistance offers a potential solution to fire blight, a damaging bacterial disease caused by Erwinia amylovora. Most resistance alleles at quantitative trait loci (QTLs) were previously characterized in diverse Malus germplasm with poor fruit quality, which reduces breeding utility. This study utilized a pedigree-based QTL analysis approach to elucidate the genetic basis of resistance/susceptibility to fire blight from multiple genetic sources in germplasm relevant to U.S. apple breeding programs. Twenty-seven important breeding parents (IBPs) were represented by 314 offspring from 32 full-sib families, with ‘Honeycrisp’ being the most highly represented IBP. Analyzing resistance/susceptibility data from a two-year replicated field inoculation study and previously curated genome-wide single nucleotide polymorphism data, QTLs were consistently mapped on chromosomes (Chrs.) 6, 7, and 15. These QTLs together explained ~28% of phenotypic variation. The Chr. 6 and Chr. 15 QTLs colocalized with previously reported QTLs, while the Chr. 7 QTL is possibly novel. ‘Honeycrisp’ inherited a rare reduced-susceptibility allele at the Chr. 6 QTL from its grandparent ‘Frostbite’. The highly resistant IBP ‘Enterprise’ had at least one putative reduced-susceptibility allele at all three QTLs. In general, lower susceptibility was observed for individuals with higher numbers of reduced-susceptibility alleles across QTLs. This study highlighted QTL mapping and allele characterization of resistance/susceptibility to fire blight in complex pedigree-connected apple breeding germplasm. Knowledge gained will enable more informed parental selection and development of trait-predictive DNA tests for pyramiding favorable alleles and selection of superior apple cultivars with resistance to fire blight.

show abstract

Section: Discussionmentioning

confidence: 99%

Fire blight QTL analysis in a multi-family apple population identifies a reduced-susceptibility allele in ‘Honeycrisp’

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…The cell wall is the largest pool of calcium in fruit tissues (Harker and Venis, 1991;White and Broadley, 2003) such that previous research has shown that calcium-rich fruit retain their firmness longer because calcium in the cell wall can delay degradation during ripening (do Amarante et al, 2013;Fallahi et al, 1996;Hirschi, 2004). Previous work has reported that 'WA 38' apples have a firmness of 8.75 kg (Evans et al, 2012), which is similar to our results (9.67 kg in 2018 and 7.58 kg in 2019). In this study, 'WA 38' was significantly firmer than 'Honeycrisp'.…”

Section: Discussionmentioning

confidence: 99%

“…'WA 38' is a new cultivar released by the Washington State University Apple Breeding Program in 2017. It is a cross between 'Honeycrisp' and 'Enterprise' (Evans et al, 2012). 'WA 38' fruit rarely exhibits bitter pit incidence (Evans et al, 2012) but the under-lying causes behind its low susceptibility to bitter pit have yet to be identified.…”

mentioning

confidence: 99%

Physiological Factors Affecting Nutrient Uptake and Distribution and Fruit Quality in ‘Honeycrisp’ and ‘WA 38’ Apple (Malus ×domestica Borkh.)

Gomez¹,

Kalcsits²

2020

horts

View full text Add to dashboard Cite

‘Honeycrisp’ is among the most widely grown apple cultivars in the United States and ‘WA 38’ is a new apple cultivar released in Washington State. ‘Honeycrisp’ is highly susceptible to bitter pit and other physiological disorders; however, ‘WA 38’ is not susceptible to bitter pit but little is known about its susceptibility to other disorders. Bitter pit is a calcium-related disorder that has been associated with localized calcium deficiencies in fruit in addition to the proportions of calcium relative to the presence of other nutrients like potassium and magnesium. The objective of this study was to compare physiological differences and fruit quality between ‘Honeycrisp’ and ‘WA 38’ to determine how these differences might correspond to differences in mineral nutrient composition and bitter pit susceptibility. Here, ‘Honeycrisp’ and ‘WA 38’ elemental composition in leaves, fruit, and xylem sap was measured every 20 days starting 30 days after full bloom and compared with leaf gas exchange and stem water potential. ‘Honeycrisp’ had greater foliar transpiration rates that corresponded with greater calcium in the leaves and lower leaf K+Mg/Ca ratio, when compared with ‘WA 38’. In contrast, fruit calcium concentrations were higher for ‘WA 38’ with lower K+Mg/Ca ratios. Xylem conductance was higher during late summer in ‘WA 38’ compared with ‘Honeycrisp’. ‘WA 38’ fruit was denser than ‘Honeycrisp’ and more research is needed to determine whether differences in fruit structure may affect susceptibility to bitter pit in apple.

show abstract

“…"WA38" is the result of a cross between "Enterprise" and "Honeycrisp" [2]. "WA38" is classified for its growth habit as a type IV cultivar [3], which indicates an acrotonic tree growth, with a natural tendency to produce on the outer part of the canopy, leaving "blind wood" or unproductive wood closer to the trunk.…”

Section: Introductionmentioning

confidence: 99%

“…Harvest time is at the end of September to the beginning of October in WA (+4 weeks from Gala). "WA38" is a "bi-color" cultivar, capable of reaching 90% red overcolor (and a dark red hue) depending on the growing region and management practices [2]. It is noted to have remarkable eating quality, being large in size, crispy, juicy, and firm, and has a long-term storage capability with no significant incidence of important storage disorders [2].…”

Section: Introductionmentioning

confidence: 99%

Optimizing Crop Load for New Apple Cultivar: “WA38”

2019

View full text Add to dashboard Cite

Crop load management is growing increasingly important as a factor related to biennial tendencies, post-harvest disorders, and inconsistent fruit quality in apples like “Honeycrisp”. Washington State University released a new apple cultivar, called “WA38”, in 2017. Limited literature is available about the productive characteristics of this new cultivar. An experimental trial evaluating the effect of crop load on leaf area, fruit quality, mineral composition, and return bloom of “WA 38” was conducted for two consecutive years (2017 and 2018) to determine an optimal crop load. Trees were trained as a spindle and grafted on Malling-9 Nic29 (Nic29) rootstocks. Crop loads were adjusted to 2, 4, 6, and 8 fruits/cm2 of trunk cross-sectional area (TCSA). Crop load had a significant effect on production, with yields ranging from 28 to 83 MT/ha in 2017. Fruit quality was impacted by increasing crop load, with a reduction in fruit weight, soluble solid content, firmness, dry matter, titratable acidity, and a delay in maturity. Leaf-to-fruit ratios were higher in lower crop loads. Relatively consistent flower bud formation was seen at the 6 and 8 fruits/cm2 categories. A possible threshold for optimal fruit quality and consistent bloom was identified around 6 fruits/cm2 TCSA.

show abstract

‘WA 38’ Apple

Cited by 29 publications

References 6 publications

Fire blight QTL analysis in a multi-family apple population identifies a reduced-susceptibility allele in ‘Honeycrisp’

Fire blight QTL analysis in a multi-family apple population identifies a reduced-susceptibility allele in ‘Honeycrisp’

Physiological Factors Affecting Nutrient Uptake and Distribution and Fruit Quality in ‘Honeycrisp’ and ‘WA 38’ Apple (Malus ×domestica Borkh.)

Optimizing Crop Load for New Apple Cultivar: “WA38”

Contact Info

Product

Resources

About