The number of roots produced by 270 micropropagated shoots of the apple cultivar Trajan. During the rooting period, all shoots were maintained under identical conditions but the shoots themselves were cultured on media containing different concentrations of cytokinin BAP, in growth cabinets with an 8 or 16 hour photoperiod. Thus each experimental condition is decribed by two factors: BAP concentration (2.2, 4.4, 8.8 and 17.6 $\mu M$) and photoperiod (8 and 16 hours).
A list containing 3 variables with 270 rows.
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