There are a couple of regulatory "genes" (transcription factors) that regulate several steps in the pathway of genes controlling fruit ripening. Two have been used some in commercial breeding: rin and nor, with rin the most popular. In the homozygous state both prohibit normal ripening, bu in the heterzygous state give the desired LSL (long shelf life) phenotype. The typical use of these is in the production of F1 hybrids where one of the parents (probably the male parent) is rin/rin and the hybrid is rin/+. Virtually all of the fruit from Mexico picked vine ripe is from rin hybrids. There is no good application of the technology in OP varieties.
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