engleski

Protein and glycoprotein patterns related to morphogenesis in Mammillaria gracillis Pfeiff. tissue culture

As plants with Crassulacean Acid Metabolism (CAM), cacti are highly affected by artificial environmental conditions in tissue culture. Plants of Mammillaria gracillis Pfeiff. (Cactaceae)propagated in vitro produced callusspontaneously. This habituated callus regenerated normal and hyperhydric shoots without the addition of growth regulators. In order to compare habituated callus with the tumorous one, cactus cells were transformed with two strains of Agrobacterium tumefaciens: wild strain B6S3 (tumour line TW) and the rooty mutant GV3101 (tumour line TR). Gne expression in cactus plants, habituated callus, regenerated shoots and two tumour lines was analyses at the level of cellular and extracellular protein and glycoprotein profiles. Proteins were separated by SDS-polyacrylamide gel electrophoresis and 2-D PAGE electrophoresis and silver stained. Concavalin A-peroxidase staining detected glycoproteins with D-manose in their glycan component on protein blots. Developmentally specific proteins patterns of Mammillaria gracillis tissue lines were detected. The 2-D PAGE electrophoresis revealed some tissue specific protein groups. The cellular glycoprotein of 42 kDa detected by Con A was highly expressed in undifferentiated tissues (habituated callus, TW and TR tumours) and in hyperhydric regenerants. Tumours produced extracellular proteins of 33, 23 and 22 kDNA. The N-glycosylation of cellular and extracellular proteins was related to specific developmental stage of cactus tissue.

Cactacaeae; crown-gall tumour; glycoproteins; morphogenesis; protein patterns

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