Quantitative and Qualitative Changes in Sugar Content of Peach Genotypes [Prunus persica (L.) Batsch.]

Abstract

<jats:p>Fruit of four clingstone peach <jats:italic>[Prunus persica</jats:italic> (L.) Batsch.] seedling populations, 54 advanced selections, and the cultivars Allgold and Goldilocks were analyzed for sugar content, soluble solids concentration (SSC), and acidity. Sucrose, glucose, fructose, and sorbitol were identified and quantified by high pressure liquid chromatography (HPLC) analysis. Variation was found for all the sugars between the seedling populations. Comparison of the means for the advanced selections with `Goldilocks' indicates that progress has already been made toward selection for a sweeter peach. Glucose, fructose, sorbitol, SSC, and acidity (citric) differed significantly for two harvest years, while sucrose and total sugar concentrations showed no significant yearly variation. A fruit maturity study revealed no significant changes in SSC, percentages of glucose, fructose, and total sugar during ripening on the tree. Acidity and percent sorbitol decreased, while the sugar: acid ratio and percent sucrose increased with increasing maturity. Broad-sense heritability of SSC, acidity, and sugar: acid ratio bad values &gt;0.72, while values for individual sugars and total sugars were much lower. Transgressive segregation for each sugar was found in seedling populations.</jats:p>

Analysis of phenotypic variation of sugar profile in different peach and nectarine [Prunus persica (L.) Batsch] breeding progenies

“…Anyway, the contribution of year to the phenotypic variance of sucrose and glucose contents was low (2.2 and 1.7% respectively), whereas the phenotypic variance of SSC explained by year was higher (17.4%). In peach a year effect has been reported for SSC, sucrose, glucose and sorbitol contents 18, 20. The year‐to‐year variation in sugar profile may be explained by the differences in climate and crop load over the 3 years of study 20.…”

“…In peach a year effect has been reported for SSC, sucrose, glucose and sorbitol contents 18, 20. The year‐to‐year variation in sugar profile may be explained by the differences in climate and crop load over the 3 years of study 20. Several studies have previously characterised Prunus populations for patterns of variation in sugar contents 18, 21.…”

Phenotypic diversity and relationships of fruit quality traits in peach and nectarine [Prunus persica (L.) Batsch] breeding progenies

“…Different studies have investigated the phenotypic diversity and relationships of fruit quality traits in peach and nectarine and other fruits germplasm such as apricot (Byrne et al 1991;Génard and Bruchou 1992;Brooks et al 1993;Esti et al 1997;Ruiz and Egea 2008). However, there is limited information on the global evaluation of fruit quality in breeding progenies and their relationships with pomological traits.…”

Phenotypic diversity and relationships of fruit quality traits in apricot (Prunus armeniaca L.) germplasm

“…On the other hand, several reports on peach have shown an important effect of the year on some pomological traits, due to the different climatic conditions (temperature, solar radiation, rainfall, etc.) (Génard and Bruchou 1992;González et al 1992;Brooks et al 1993). However, there is scarce information with regard to these year-by-year variations in apricot ).…”