Most citrus fruit trees are grown as a "grafted combination" of: a scion (good-fruit-quality tree) on the top; and a rootstock - cultivar which resists or tolerates infection by certain disease(s), that forms the lower trunk and root system.
Examples of rootstocks:
^ Sweet orange (Citrus×sinensis, or Citrus×aurantium var. sinensis)
= Citrus maxima (pummelo) × Citrus reticulata (mandarin)
Blood orange (Citrus×aurantium var. dulcis)
Bergamote (Citrus×aurantium ssp. bergamia)
Reference:
Citrus Rootstocks@Agricultural Research Service, USDA
https://citrusrootstocks.org/
Comparison between diploid and tetraploid citrus rootstocks: morphological characterization and growth evaluation, 2014
https://doi.org/10.1590/brag.2014.007
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