Chrysanthemum Foliar Necrosis: Transmission Electron Microscopy of Leaf Lesions

Plants of the Marble cultivars of Dendranthema grandiflora (formerly Chrysanthemum × morifolium) often display necrotic spotting of lower leaves and premature leaf tissue from unaffected chrysanthemum cultivars Vero, Fanfare, Surf, and Bonnie Jean. P-protein and plastid complexes in sieve elements of the Marble cultivars were often highly electron-dense and sieve and companion cell obliteration sometimes appeared enhanced over controls (...)