Effects of Cutting Status and Chemical Treatments on the Rooting of Cuttings in Some Ornamental Shrubs
Date Issued
2012
Date
2012
Author(s)
Huang, Yen-Jung
Abstract
Abstract
For cutting propagation of ornameantal plants, cutting internal conditions and rooting promoters are most important factors which affect rooting of cuttings. This study investigated the effects of cutting conditions, rooting promoters (IBA, NAA and salicylic acid), rooting cofactors (thiamine, ascorbic acid and catechol) and a complex rooting promoter (NTU Rooting Inducer) on the rooting of cuttings in four ornamental shrubs (Duranta repens ‘Golden Leaves’, Ixora williamsii, Rhododendron pulchrum, and Camellia japonica).
On the effects of cutting internal conditions, SPAD 502 and NDVI 300 (740 nm~660 nm) were used to measure chlorophyll meter reading (CMR) and leaf vegetation index (VI) of cutting leaves. Rhododendron pulchrum cuttings with higher CMR had more root numbers and longer maximum root length. Camellia japonica cuttings with higher CMR had higher rooting percentage and higher rooting stage. Various CMR of cutting leaves had no effect on rooting of Ixora williamsii cuttings. In addition, Ixora williamsii and Rhododendron pulchrum cuttings with higher VI had higher rooting stage, and also had more root numbers and longer maximum root length. Camellia japonica cuttings with higher VI had higher rooting percentage and higher rooting stage.
On the effects of rooting promoters, various chemical treatments were 2000 mg‧L-1 IBA, 2000 mg‧L-1 NAA and salicylic acid (10-6 M, 10-4 M and 10-2 M). The treatment of 2000 mg‧L-1 NAA gave more root numbers, longer maximum root length and more root dry weight of Duranta repens‘Golden Leaves’ cuttings, and had longer maximum root length of Ixora williamsii cuttings. The treatment of 2000 mg‧L-1 IBA＋2000 mg‧L-1 NAA gave higher rooting percentage and higher rooting stage of Ixora williamsii cuttings, and had more root numbers of both Ixora williamsii and Rhododendron pulchrum cuttings. In addituon, salicylic acid increased root numbers in cuttings, but its effect changes as plants species. Treatment of 2000 mg‧L-1 IBA＋10-4 M salicylic acid promoted more root numbers in Duranta repens ‘Golden Leaves’, Ixora williamsii and Rhododendron pulchrum cuttings, and gave longer maximum root length and more root dry weight of Ixora williamsii cuttings.
On the effects of rooting cofactors, thiamine (T) treatments showed that except treatment of 1000 mg‧L-1 thiamine had more root numbers in Camellia japonica cuttings, treatment of 2000 mg‧L-1 IBA＋800 mg‧L-1 T had more root numbers in Duranta repens, Ixora williamsii and Rhododendron pulchrum cuttings. The ascorbic acid (AA) treatments indicated that treatment of 2000 mg‧L-1 IBA＋1000 mg‧L-1 AA gave more root numbers and higher root dry weight in Duranta repens, Rhododendron pulchrumi and Camellia japonica cuttings. The catechol (C) treatments showed that treatment of 2000 mg‧L-1 IBA＋50 mg‧L-1 C had more root numbers in all four tested plant cuttings.
On the effects of NTU Rooting Inducer, cuttings treated with NTU Rooting Inducer powder and solution had better rooting ability than those treated with IBA and the control. And cuttings treated with NTU Rooting Inducer solution had best rooting ability than the other treatments in Ixora williamsii, Rhododendron pulchrum, and Camellia japonica. Comparing the effect of ABT rooting powder and NTU Rooting Inducer indicated that NTU Rooting Inducer solution had better rooting ability in Duranta repens‘Golden Leaves’ and Ixora williamsii cuttings. And NTU Rooting Inducer powder and solution had more root numbers and longer maximum root length in Rhododendron pulchrum cuttings. In addition, NTU Rooting InducerⅡ had better rooting ability in Camellia japonica cuttings.
In conclusion, on cutting internal factors, leaf vegetation index could be a useful index for cutting quality. On rooting promoters, cuttings treated with IBA, NAA, or salicylic acid alone, had better rooting ability than those did not be treated with any rooting promoters. The combinations of auxin and salicylic acid, or plus some rooting cofactors (such as thiamine, ascorbic acid or catechol) indicated that the combinations often had better rooting ability than single chemical. This phenomenon showed complex rooting promoter has great potential in commercial application.
Subjects
cutting
chemical treatments
ornamental shrubs
Type
thesis
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