Abstract
The physiological age of mother tubers (Solanum tuberosum L. cv. Kennebec) used as a source of material influenced kinetin-induced in vitro tuberisation. Tuberisation significantly increased with physiological age. Kinetin- or ancymidol-induced tuberisation, plantlet and microtuber dry weight decreased with increasing number of subcultures. Single-node segments obtained from tubers stored for more than 9.5 months at 4 °C showed increased kinetin-induced tuberisation rates and earlier tuberisation than those obtained from younger tubers. For any physiological age, material may be safely multiplied using node propagation until the third subculture and bioassayed for tuberisation without variation in the response.
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