What organisms must be crossed to obtain prolific heterotic forms?

these are distant varieties of the same species
Heterosis is a phenomenon of “hybrid strength.” By heterosis we understand the superiority of the first generation offspring over parental forms in terms of vitality, endurance, productivity, arising from the crossbreeding of different races, animal breeds, etc.
To use heterosis and obtain prolific hybrids for practical purposes, intersortal crossings of homozygous varieties of self-pollinating plants, intersortal (interpopulation) crossings of self-pollinated lines of cross-pollinating plants and sortlinear crosses are used

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