Reig G.,IRTA Estacio Experimental de Lleida |
Iglesias I.,IRTA Estacio Experimental de Lleida |
Echeverria G.,IRTA Area de Postcollita
Acta Horticulturae | Year: 2012
The effect of flat peach and flat nectarine cultivars on agronomical performance, fruit quality and sensory attributes was evaluated at IRTA-Lleida (Spain) during several seasons. 'Sweet Cap®' and 'Mesembrinecov' were used as reference cultivars for peaches and nectarines, respectively. Blooming was, in general, similar for different cultivars and occurred between 'Big Top®' and 'O'Henry®' (reference cultivars). Blooming intensity was high or very high for most of the cultivars except 'Ordigancov'. Fruit set and hand thinning requirements were also high for all the cultivars except 'Oriolacov' and 'UFO-6® (Isfroplat-6Dcov)'. The harvest period ranged from the end of May ('UFO-1® (Isfroplat-1 Dcov)') to the middle of September ('FlatlatecakeDcov'). Early yields were recorded for all cultivars except 'Oriolacov', which exhibited delayed yielding. Of the mid-season cultivars, 'Sweet Cap' was the peach cultivar that provided the greatest yield and fruit size and 'Mesembrinecov' was the nectarine with the greatest colour. Fruit quality parameters were not affected by fruit type: peach or nectarine. Mean fruit diameter ranged from 55 mm ('UFO-1® (Isfroplat-1Dcov)') to 75 mm ('Oriolacov') depending on harvest time and cultivar. Lower fruit weight was recorded for the most precocious cultivars: 'UFO-1® (Isfroplat-1Dcov)' and 'UFO-2® (Isfroplat-2Dcov)', while 'Oriolacov' had the greatest weight. Fruit colour was affected by cultivar and harvest date. The best colour was recorded for cultivars harvested from mid-June to mid-August. Fruit firmness was lower in early harvested cultivars than in medium or late ones. Soluble solids content ranged from 10 °Brix ('UFO-2® (Isfroplat-2Dcov)') to 16 °Brix ('Nectacake®28 (ASF 04-71Dcov)'). Titratable acidity was medium to low for all cultivars except 'Donutnicecov', which had the greatest content. Values ranged from 1.5 ('UFO-6® (Isfroplat-6 Dcov)') to 10 g/L ('Donutnicecov'). Sensory attributes were assessed for 12 cultivars, using 'Big Top®' as the reference for sweet taste cultivars and 'Diamond Raycov' for acid taste cultivars. All the cultivars except 'Donutnicecov' exhibited a sweet taste. © ISHS 2012.
Iglesias I.,IRTA Estacio Experimental de Lleida |
Echeverria G.,IRTA Area de Postcollita |
Lopez M.L.,Avda. Rovira Roure
Scientia Horticulturae | Year: 2012
The effect of strain on fruit color development and anthocyanin content, fruit quality, volatile compound emissions and consumer acceptability was evaluated on seven 'Fuji' apple strains (Malus domestica Borkh.) at the IRTA (Spain) over a period starting three weeks commercial harvest in 2008 and ending one week after harvest. Based on fruit color, measured with a portable tristimulus colorimeter, and anthocyanin content, the most colored strain was 'Zhen Fuji Aztec' (blushed), followed by 'Fuji 6629' (also blushed), 'Fuji Kiku 8' and 'Rubin Fuji' (both striped). 'Fuji Chofu 2' (blushed) and 'Fuji Suprema' (barely striped) were the least colored strains, although fruit color started earlier in the last one. 'Ogura' (barely striped) provided intermediate values. The most important increase in anthocyanin content and decrease in hue values was recorded from one week before commercial harvest until harvest, in all strains except 'Fuji Suprema'. Highly colored strains developed a red color on both sides of the fruit with greater average values for strains with greater colored surfaces than for less colored strains. A medium relationship between hue angle, L* and a*/b* ratio and anthocyanin content was established.Fruit quality parameters for the different harvest dates as fruit firmness, soluble solid content (SSC), titratable acidity (TA), and starch index were similar for the different cultivars and date. Fruit firmness is well maintained across different dates even with high values of starch index. Differences in fruit color, intensity and type, were not related to differences in the fruit quality parameters of the different strains. Ripening time was therefore not related to the intensity or type of fruit color.There are some quantitatively and qualitatively differences among the volatile profiles of all the 'Fuji' strains. In quantitative terms, the 'Fuji' strain that emitted the lowest total concentration was 'Fuji Aztec'. There were no statistical differences among the total volatile compound concentrations of 'Fuji Kiku 8', 'Rubin Fuji', 'Fuji 6629' and 'Fuji Chofu 2', which obtained the highest values. The main volatile compound emitted for all of the analyzed strains was the 2-methylbutyl acetate. In general, apples of the most colored strains emitted less volatile compound compared to the least colored. Concerning to consumer acceptability, 'Fuji Aztec' strain got the lowest mean score, but there were no differences among the rest of 'Fuji' strains. A full-data principal component analysis was run. This analysis showed a high correlation between consumer acceptability and some of the volatile compounds emitted, in addition to fruit that exhibit bigger hue angles on the exposed side (lower red color). © 2012 Elsevier B.V.