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Plant Sci. 2000 Jul 28;156(2):213-219.

Polysomaty analysis in diploid and tetraploid Portulaca grandiflora.

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Plant Cell Technology Laboratory, Faculty of Horticulture, Chiba University, 648 Matsudo, Matsudo City, 271-8510, Chiba, Japan


Polysomaty analysis of the succulent portulaca (Portulaca grandiflora Hook.) plant was carried out using flow cytometry. For both diploid and tetraploid plants, mature leaf tissue was found to have a higher level of polysomaty than young leaf tissue. Mesophyll (MP), bundle sheath (BSP) and water storage protoplasts (WSP) were isolated from leaf tissues of diploid portulaca plants. WSP had a higher degree of endopolyploidization than MP and BSP. The ploidy distribution was also variable in different floral organs. Tetraploid plants artificially induced by colchicine treatment showed a decline in the degree of polysomaty compared to diploid plants. Tetraploid plants had more spherical leaves, a larger number of petals and lower pollen fertility than diploid plants.

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