Historical Trends in Strawberry Fruit Quality Revealed by a Trial of University of Florida Cultivars and Advanced Selections

Fresh strawberries (Fragaria x ananassa) are valued for their characteristic red color, juicy texture, distinct aroma, and sweet fruity flavor. In this study, genetic and environmentally induced variation is exploited to capture biochemically diverse strawberry fruit for metabolite profiling and consumer rating. Analyses identify fruit attributes influencing hedonics and sensory perception of strawberry fruit using a psychophysics approach. Sweetness intensity, flavor intensity, and texture liking are dependent on sugar concentrations, specific volatile compounds, and fruit firmness, respectively. Overall liking is most greatly influenced by sweetness and strawberry flavor intensity, which are undermined by environmental pressures that reduce sucrose and total volatile content. The volatile profiles among commercial strawberry varieties are complex and distinct, but a list of perceptually impactful compounds from the larger mixture is better defined. Particular esters, terpenes, and furans have the most significant fits to strawberry flavor intensity. In total, thirty-one volatile compounds are found to be significantly correlated to strawberry flavor intensity, only one of them negatively. Further analysis identifies individual volatile compounds that have an enhancing effect on perceived sweetness intensity of fruit independent of sugar content. These findings allow for consumer influence in the breeding of more desirable fruits and vegetables. Also, this approach garners insights into fruit metabolomics, flavor chemistry, and a paradigm for enhancing liking of natural or processed products.

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“…Fruit are cultivated according to current commercial practices for annual strawberry plasticulture in Florida [1], [29](Fig. 1A).…”

Section: Methodsmentioning

confidence: 99%

Strawberry Flavor: Diverse Chemical Compositions, a Seasonal Influence, and Effects on Sensory Perception

et al. 2014

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“…Improvements in quality traits such as fruit size, yield uniformity, and cull rates have been evident when comparing cultivars from different eras (Whitaker et al 2011). However, regular screening for PhCR has been conducted at UF only in the last 5 yr.…”

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confidence: 99%

Pedigree-Based Analysis in a Multiparental Population of Octoploid Strawberry Reveals QTL Alleles Conferring Resistance toPhytophthora cactorum

Mangandi

Verma

Osorio

et al. 2017

G3 Genes|Genomes|Genetics

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Understanding the genetic architecture of traits in breeding programs can be critical for making genetic progress. Important factors include the number of loci controlling a trait, allele frequencies at those loci, and allele effects in breeding germplasm. To this end, multiparental populations offer many advantages for quantitative trait locus (QTL) analyses compared to biparental populations. These include increased power for QTL detection, the ability to sample a larger number of segregating loci and alleles, and estimation of allele effects across diverse genetic backgrounds. Here, we investigate the genetic architecture of resistance to crown rot disease caused by Phytophthora cactorum in strawberry (Fragaria × ananassa), using connected full-sib families from a breeding population. Clonal replicates of > 1100 seedlings from 139 full-sib families arising from 61 parents were control-inoculated during two consecutive seasons. Subgenome-specific single nucleotide polymorphism (SNP) loci were mapped in allo-octoploid strawberry (2n = 8 × = 56), and FlexQTL software was utilized to perform a Bayesian, pedigree-based QTL analysis. A major locus on linkage group (LG) 7D, which we name FaRPc2, accounts for most of the genetic variation for resistance. Four predominant SNP haplotypes were detected in the FaRPc2 region, two of which are strongly associated with two different levels of resistance, suggesting the presence of multiple resistance alleles. The phenotypic effects of FaRPc2 alleles across trials and across numerous genetic backgrounds make this locus a highly desirable target for genetic improvement of resistance in cultivated strawberry.

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“…It may also be advisable to evaluate color of advanced selections both before and after cold storage. An analysis of released UF strawberry cultivars indicated that those noted for their attractive, bright red external coloration had the highest a* values and often had the highest L* values (Whitaker et al 2011). Those that were often regarded as having a dark, overripe appearance had the lowest L* values.…”

Section: Discussionmentioning

confidence: 99%

Estimation of genetic parameters and gains for color traits of strawberry

2011

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An investigation of strawberry (Fragaria 9 ananassa Duch.) fruit and juice color dimensions (L* a* b*) was conducted to estimate genetic parameters and determine breeding strategies for improving fruit color in the University of Florida strawberry breeding population. The genetic analysis was conducted using clonally replicated seedlings from a factorial mating design with additional biparental crosses and was evaluated in two locations. Substantial additive and non-additive genetic variation was described for most traits. Low genotype by environment interactions indicate that color evaluations may be conducted in either of the two test locations. Consistent with previous reports, genetic correlations indicated that internal and external fruit colors are under separate genetic control. Colorimeter a* and L* values described the same information for internal color in that internal flesh that was darker in color also appeared more red. A method was developed to reliably measure a* and L* for small (2 ml) samples of strawberry juice. Juice a* had significant genetic correlations with internal a* and may be used as a correlated trait to improve the internal redness of the fruit. However, pigments from the external tissues of the fruit appear to also impact the L* value of strawberry juice, complicating the effects of selection on juice color traits.

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Historical Trends in Strawberry Fruit Quality Revealed by a Trial of University of Florida Cultivars and Advanced Selections

Cited by 51 publications

References 19 publications

Strawberry Flavor: Diverse Chemical Compositions, a Seasonal Influence, and Effects on Sensory Perception

Strawberry Flavor: Diverse Chemical Compositions, a Seasonal Influence, and Effects on Sensory Perception

Pedigree-Based Analysis in a Multiparental Population of Octoploid Strawberry Reveals QTL Alleles Conferring Resistance toPhytophthora cactorum

Estimation of genetic parameters and gains for color traits of strawberry

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