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ISHS Acta Horticulturae 1212: Proceedings of the 2017 Annual Meeting of the International Plant Propagators' Society

Comparison of growth, yield, and fruit quality of own-rooted and grafted 'Spirit of '76' mango trees grown in pots©

Author:   M. Fumuro
DOI:   10.17660/ActaHortic.2018.1212.86
To assess the practicality of using pots to grow mango cultivar 'Spirit of '76' (Mangifera indica L.) trees using their own roots propagated by air layering and trees grafted onto Taiwanese native-strain rootstock were planted in pots containing approximately 25 L of soil. The growth, yield, and fruit quality of the trees were monitored and measured for 7 years after planting. Trunk diameter was significantly smaller in the own-rooted compared with the grafted trees for the first 5 years, but there was no difference between the two after 6 years. The trunk diameter of the own-rooted trees was also significantly greater than the scion diameter of the grafted trees after 3 years. The total green-branch length was at least as long in the own-rooted trees as it was in the grafted trees after 3 years, and the leaf number tree-1 was greater in own-rooted than in grafted trees after 4 years. There were no significant differences in height between the two tree types. Fresh and dry weights were significantly greater for leaves, green branches, thick branches, above-ground parts of trees, fine roots, and whole trees, but significantly lower for the trunks of own-rooted trees compared with those of grafted trees. However, there were no significant differences in the weights of thick roots and under-ground parts of trees between the two tree types. The dry matter top/root biomass (T/R) ratio was significantly higher (47%) in own-rooted trees, but the fresh weight T/R ratio did not differ significantly between the two tree types. In addition, there were no significant differences in yield tree-1, fruit numbers tree-1, or fruit quality between own-rooted and grafted trees. Based on these results, it is suggested that own-rooted mango trees may be grown in pots because their growth characteristics are similar to, or perhaps even better than, those of grafted trees, and yield and fruit quality do not differ between the two.

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