Cultivation

Orange Rootstock

Citrus sinensis (L.) Osbeck

The selection of rootstock for orange determines resistance to the tristeza virus, soil adaptability, and the biochemical profile of the fruit. In cases of scion incompatibility, agronomists utilize sweet orange interstocks.

In the reference 16 varieties crop Sweet orange, where this is mentioned in the description.

Compatibility with the rootstock is critical for oranges, as symptoms of incompatibility manifest as excessive tissue overgrowth at the graft union followed by tree decline. In such cases, the barrier can be overcome by using an interstock (intercalary rootstock). The rootstock directly influences fruit ripening time, acidity, and sugar accumulation capacity.

The historically prevalent sour orange has been largely excluded from use due to its susceptibility to the tristeza virus. Trifoliate orange allows for the production of compact trees but is sensitive to high pH and drought. In modern production, preference is given to hybrid rootstocks, such as citranges and citrumelos, which combine growth vigor with high disease resistance.

In the event of viral and viroid infections, rootstocks determine morphological changes in the root system, such as root length, diameter, and density, which alter the tree's ability to absorb water and nutrients. Orange possesses the most extensive database regarding long-term rootstock compatibility due to large-scale industrial cultivar trials.

General information about the subject — on the page Rootstock.

Sources8

Varieties of Sweet orange mentioned in the description

Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.