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Comparative Morphology of Starch Grains in Latex from Varieties of Poinsettia, Euphorbia pulcherrima Willd. (Euphorbiaceae)

The comparative morphology of plastid starch grains in latex from the nonarticulated laticifer was examined in eight varieties of Euphorbia pulcherrima Willd. (poinsettia). Starch grain shape was similar in all varieties. Starch grain length and width were comparable for mature grains collected from different leaves of the vegetative shoot, in leaves and bracts from flowering plants of different diploid and tetraploid varieties, and in leaves from diploid and tetraploid plants in vegetative and flowering conditions. Laticifer starch grain morphology is highly stable in plastids in these varieties of E. pulcherrima throughout vegetative and floral development and reflects the presence of a control mechanism in the plastid genome of the laticifer. These results support an interpretation that starch grain development and form in laticifer plastids in leaves among taxa of Euphorbia are genetically controlled in the laticifer and are independent of the mechanism controlling grain morphology for other cell types.