Summary
Nodal cuttings from micropropagated potato plantlets give rise to microtubers when placed on Murashige and Skoog medium containing 6% sucrose and 2.5 mg/liter kinetin and incubated in the dark at 19°C. Microtubers produced from the cultivar Superior were shown to contain the same characteristic group of proteins as field-grown tubers. As with field-grown tubers, the 40 000-dalton major tuber glycoprotein, patatin, accumulated to high levels in microtubers, reaching 3.7±0.2 mg/g fresh weight after 90 d. Also in agreement with field-grown plants, stems and leaves of micropropagated plantlets did not contain detectable levels of patatin, but small amounts of an electrophoretically distinct form accumulated transiently in roots. Patatin mRNA is readily detectable in developing microtubers 15 d after transfer of the cuttings to inductive medium. Patatin mRNA was also present in roots, but as with field-grown plants, was 50- to 100-fold less abundant and could be distinguished from that in tubers by primer extension. Microtuber development and patatin accumulation were inhibited by gibberellic acid.
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This work was supported by grants 83-CRCR-1-1348 and 85-CRCR-I-1792 from the U.S. Department of Agriculture Competitive Grants program and with funds from the Texas Agricultural Experiment Station.
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Bourque, J.E., Miller, J.C. & Park, W.D. Use of an in vitro tuberization system to study tuber protein gene expression. In Vitro Cell Dev Biol 23, 381–386 (1987). https://doi.org/10.1007/BF02620996
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DOI: https://doi.org/10.1007/BF02620996