Effect of rootstock on taste-related properties of Nordic apple cultivars
2011
Mainla, L. | Noormets, M. | Moor, U. | Karp, K. | Jalakas, M.
The effect of rootstock on taste-related properties of four Nordic apple (Malus × domestica Borkh.) summer cultivars (‘Valge Klaarõun’, ‘Maikki’, ‘Pirja’, ‘Krasnoje Rannjaja’) grafted on three different rootstocks (M.26, M.9, B.396) was studied. The experiment was carried out in South Estonia in 2003 and 2004. Rootstock had a significant effect on apple titratable acidity (TA) in both years. In 2003, B.396 decreased TA in ‘Pirja’, ´Krasnoje Rannjaja’ and ‘Maikki’ apples. In both years rootstock had the same effect only on ‘Valge Klaarõun’ where B.396 increased TA content in apples. In 2003 rootstock had a significant effect on soluble solids content (SSC) only on ‘Valge Klaarõun’ where M.26 increased significantly fruit SSC. In the second year fruits of ‘Maikki’ on M.9 had significantly lower SSC. SSC and TA ratio ranged from 5 to 30. In 2003 rootstock had a significant effect on SSC/TA in fruits of all cultivars. In 2004 no significant effect was observed except on ‘Maikki’. In ‘Valge Klaarõun’ fruits the SSC/TA was significantly higher with M.26. The mean ascorbic acid content (AAC) in apples was 19.3 mg 100 g-1 FW in 2003 and 11.6 mg 100 g-1 FW in 2004. In both years rootstock had no significant effect on fruit AAC of ‘Maikki’. ‘Krasnoje Rannjaja’ grafted on M.9 had significantly higher fruit AAC in 2003. ‘Valge Klaarõun’ apples grafted on M.26 had increased AAC.
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