seed count, fruit quality and storage properties in four apple cultivars

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J. Blažek and I. Hlušičková 200 180 Fruit weight [g] 160 140 120 100 y = - 4.02x+ 17.4 r = - 0.28 80 60 2 3 4 5 6 7 8 Number of seeds Figure 3. Seed count versus fruit weight in ‘Golden Delicious’ from an unthinned orchard in 1973 250 Wei ght of fruit [g] 200 150 100 50 2001 2002 2003 0 2 3 4 5 6 7 8 9 10 11 12 Seed number L.S.D. P≥0.05 = 9.0, 12.4 and 14.2 for 2001, 2002 and 2003 respectively Figure 4. Seed count and fruit weight in ‘Resista’ from 2001 to 2003 156 J. Fruit Ornam. Plant Res. vol. 14 (Suppl. 2), 2006: 151-160
Count, fruit quality and storage properties in…apple… No correlation was found between seed count and ribbin33g or malformation, probably because the apples in this study were generally well pollinated and seed count was probably above the critical level connected with these problems. Seed count was also not correlated with skin waxiness and blushing (data not presented). There was a correlation between seed count and calyx opening only in ‘Nabella’. Fruits with higher seed counts more often had closed calyces. In ‘Nabella’, fruits with a higher seed count had higher vitamin C content. Except for this, though, high seed count was generally negatively correlated with almost all fruit quality parameters. These conflicts with some studies in the literature which report that seed count is positively correlated with acidity and firmness. The discrepancy may be due to the fact that the apples were evaluated at different stages of maturity. Seed count was correlated with calcium content in only one single case in this study. This conflicts with other studies in the literature. In fact, one year, there was a markedly negative correlation between seed count and calcium content in ‘Resista’. However, it should be kept in mind that calcium content in apples is also negatively correlated with fruit size (Broom et al., 1998; Tomala, 1999). Calcium concentration has also been reported to be negatively correlated with ethylene concentration (Tomala and Dilley, 1989). ‘Resista’ is one of the apple cultivars with an extremely high concentration of ethylene (Goliáš, 2005). There is probably a complex interrelationship between all of these factors. 40 30 % 20 10 Rotten fruits Breakdown Bitter pit 0 1-2 2-5 5-8 over 8 Seed number L.S.D. P≥0.05 = 7.4, 15.0 and 9.3 for rotten fruits, breakdown and bitter pit respectively Figure 5. Seed count versus fruit rotting, internal breakdown and bitter pit in ‘Nabella’ J. Fruit Ornam. Plant Res. vol. 14 (Suppl. 2), 2006: 151-160 157
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seed count, fruit quality and storage properties in four apple cultivars

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