Relationships between fruit quality traits at harvest for 'Cluthagold' apricot
Over 4000 'Cluthagold' apricot fruit were assessed at harvest in a range of trials carried out in the Central Otago region of New Zealand over a four-year period. The data collected included non-destructive measurements of skin and flesh colour, and destructive assessments of flesh firmness (FF), fruit soluble solids concentration (SSC) and fruit dry matter concentration (DMC). These datasets were used to examine relationships between fruit quality attributes to gain further understanding of 'Cluthagold' fruit maturity. The strongest relationships were for skin background colour and flesh colour with FF. The relationship between SSC and FF was only moderate (R = 0.52), whereas between SSC and DMC was strong (R = 0.83). There was very little difference in the relationship between SSC and DMC from different orchards or years, suggesting that SSC could be used to predict DMC from any orchard in future years using a single regression equation. In 2013, a DA meter, which measures chlorophyll content in the fruit (IAD index), was evaluated as a potential non-destructive fruit maturity predictor at harvest. The IAD index at harvest was significantly correlated with FF, SSC and DMC at harvest for 'Cluthagold' fruit. IAD both at harvest and after 2, 4 and 6 weeks cold storage showed weak relationships with all other post-storage fruit quality measurements.
Scofield, C., Stanley, J., Marshall, R. and Alspach, P. (2016). Relationships between fruit quality traits at harvest for 'Cluthagold' apricot. Acta Hortic. 1120, 415-422
flesh firmness, soluble solids concentration, dry matter concentration, DA meter, Prunus armeniaca L