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Two cytoplasmic genomes exist in plant in addition to the nuclear one. As far as I understand, they divide more or less during the entire life of the plant along with cell proliferation/growth in meristem. That means that somatic mutations arise. Can this variation accumulate and be passed on to offsprings? Let's say there is a mutation in plastid DNA that spread in a meristem before flower formation, will you find these mutation in the pollen/ovule plastid ? Or is there a way to keep the original genome intact for germinal cell? e.g: stock of proplastid/mitochondria in meristems that doesn't divide before reproductive tissue formation?

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  • $\begingroup$ Not 100% sure so I'm not making this an answer, but yes - that's how many of the varieties of varigated plants came into being, as sports from an original, taken as cuttings then bred. $\endgroup$ – bob1 Apr 21 at 21:12

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