Abstract
Dahlias (Dahlia x hybrida) are an important flower crop that have been cultivated in a greenhouse in recent years. However, limited information is available on rooting potential of type of cuttings in response to varying indole-3-butyric acid (IBA) concentration. In the present study, the influence of IBA on the rooting and growth characteristics of Dahlia cuttings was analyzed. The Dahlia cuttings (with heel) were excised form the sprouted tubers and the cuttings without heel were taken from tender terminal shoots. Exogenously applied IBA (1500 mg L−1) for 5 s influenced the rooting characteristics with considerably earlier (17.5 days) root initiation with more number (6.7) and longer length (11.5 cm) of roots. The Dahlia softwood cuttings excised from tuberous shoots yielded better rooting when treated with IBA (1500 mg L−1). Authors suggest Dahlia nursery growers to undertake replicated trials before mass multiplication, to ascertain the varietal response of cuttings to rooting at varying IBA concentration.
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