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A periwinkle flower undergoing reversion to green foliage upon infection and disease development caused by the aster yellows phyoplasma.

Periwinkle flowers undergoing reversion to green foliage upon infection and disease development caused by the aster yellows phyoplasma.

Definition

Reversion is a reversal of normal plant ontogeny and development wherein achlorphyllous flowers revert to chlorphyllous foliage.