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Greenspur on selected rootstock - a better green.

Drake, S. R.; Larsen, F. E.; Higgins, S. S.;

Good Fruit Grower Year: 1993 Vol: 44 Issue: 17 Pages: 75-77

1993

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Greenspur on selected rootstock - a better green.

The storage quality of fruits from trees of the apple cultivars Granny Smith and Greenspur on seedling, M.26 or MM.111 rootstocks, planted in 1982, was studied. There were no differences in postharvest fruit ripening rates between cultivars or between rootstocks at either of the harvesting dates (commercial harvest and 10 days earlier). Fruits were cold-stored for 0, 60 ot 120 days. Fruits of Granny Smith were firmer than those of Greenspur. Fruits from trees on M.26 were the firmest. Between the first and second harvests there was a reduction in fruit firmness of about 1 lb; as the duration of cold storage increased to 60 days a significant fall of about 2.5 lb was observed, but there was no further reduction beyond 60 days. Throughout the harvest and storage period, the fruit soluble solids content and titratable acidity were slightly but consistently higher in Granny Smith than in Greenspur. Fruits from trees on M.26 had a soluble solids content 0.5% higher than those from trees on other root

stocks. Fruits from trees on seedling and M.26 had similar higher titratable acidity than those from trees on MM.111. Harvest date did not influence contents of either soluble solids or titratable acidity. As storage duration increased, there was an increase in soluble solids while titratable acidity decreased. After 120 days, Greenspur fruits developed more scald than Granny Smith (both cultivars were severely affected without scald control). Fruits from trees on M.26 showed least scald. Later harvest was associated with more scald. Regardless of rootstock, Granny Smith fruits were lighter in colour than Greenspur fruits and remained so during storage. Yellowing during storage was slower in Greenspur than in Granny Smith. The contents of sucrose and fruit flesh Ca were higher in Granny Smith than in Greenspur, and K and P contents were slightly lower and B content much lower. Fruits from trees on MM.111 and M.26 contained more sucrose than those from trees on seedling rootstocks. The highest sorbitol and so

luble solids content were found in fruits from trees on M.26. Data are tabulated.