Direct shoot regeneration in the rose: genetic variation of cultivars.

Summary Genetic variation for direct shoot regeneration from in vivo grown leaf explants of 24 current cut rose cvs and clonal rootstocks was studied in vitro. Processes of shoot regeneration were followed for 25 days. Significant genetic variation occurred for: (i) percentage of shoot regeneration, (ii) days to shoot regeneration, (iii) number of adventitious buds and (iv) length of adventitious shoots. Significant correlations between these parameters occurred. Variation for (in)direct shoot regeneration in rosaceous crops is discussed. Present direct shoot regeneration is compared to vigour on plant level.

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