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Vegetative propagation of 'GF 677' (P. persica x P. amygdalus) stone fruit rootstock
Thesis (M. Sc. Agric.) -- University of Stellenbosch, 1995.
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| Format: | Thesis |
| Language: | English |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613847961993216 |
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| access_status_str | Open Access |
| author | Du Toit, Jeanne |
| author2 | Theron, K. I. |
| author_browse | Du Toit, Jeanne Theron, K. I. |
| author_facet | Theron, K. I. Du Toit, Jeanne |
| author_sort | Du Toit, Jeanne |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (M. Sc. Agric.) -- University of Stellenbosch, 1995. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/54933 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:42:38.497Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/54933 Vegetative propagation of 'GF 677' (P. persica x P. amygdalus) stone fruit rootstock Du Toit, Jeanne Theron, K. I. Jacobs, G. Stellenbosch University. Faculty of AgriSciences. Dept. of Horticultural Science. Plant propagation Stone fruit -- Propagation Stone fruit -- Rootstocks Dissertations -- Horticulture Thesis (M. Sc. Agric.) -- University of Stellenbosch, 1995. GF 677 is an invigorating rootstock with improved adaptability to calcareous soils and high resistance to lime-induced iron chlorosis. Rootability of GF 677 is however, unknown under South African conditions. Hardwood cuttings of ‘GF 677’, 30 cm long, were collected monthly from leaf fall (April) to about six weeks before budbreak (August). Basal ends of cuttings were split longitudinally, treated with indole-3-butyric acid (1000 ppm) for 5 s and placed on bottom heat of 21 ± 3C. After 1, 2, 3, 4, or 5 weeks of bottom heat, cuttings were either planted in the nursery at Clanwilliam (32°22'S) or placed in a greenhouse covered with transparent plastic. The latter were planted out in August or September. Cuttings planted directly in the nursery or the tunnel, without any bottom heat treatment, served as controls. Cuttings collected at leaf drop (April) gave the highest survival percentage in the nursery. Survival percentage decreased progressively with later collection dates. Bud break occurred after 3 to 5 weeks on bottom heat when cuttings were collected in July and August. These cuttings rooted poorly. Thick cuttings survived better than thin cuttings. High survival percentages were achieved when cuttings were planted in the nursery after 1 to 3 weeks of bottom heat to induce callus formation. Longer periods of bottom heat caused fragile, white roots to form that were damaged when transplanted. This was also the case when cuttings were placed in an unheated tunnel after bottom heat. In a following study, it was found that the survival percentage of cuttings planted in the nursery after 2 weeks bottom heat was comparable to those stored in a cold room (4C) or tunnel for 1, 2 or 3 weeks after bottom heat, before planting. Cuttings can therefore be stored in a tunnel or cold room after bottom heat if field conditions are unfavourable. Cuttings stored in the tunnel for 3 weeks started to develop fine roots which complicated handling. Storage at 4C for 2 to 3 weeks satisfied the chilling requirement of cuttings. These cuttings started to grow earlier in spring and the longer growing season could result in larger nursery trees. When bottom heat was substituted by storing cuttings in plastic bags for 2 weeks in a dark room at room temperature (± 21C), survival percentage was reduced. Cutting length and diameter were also investigated, as well as the source of cuttings from mother plants, viz. sylleptic or main shoots. A very poor survival percentage was achieved with cuttings from sylleptic shoots. Cuttings from main shoots rooted better than cuttings taken from sylleptic shoots on the main stems. Survival percentage decreased when cutting length decreased from 30 to 15 cm. Bottom heat treatment for a period of 1 to 2 weeks resulted in an increase in the levels of free IAA in 'GF 677', most noticible in the bark of hardwood cuttings. This increase in the auxin concentration might be the stimulus or trigger for root initiation, leading to subsequent root formation. We recommend that cuttings should be collected from main shoots (6-16 mm thick, 30 cm in length) of mother plants in April or May (leaf drop), treated with IBA (1000 ppm) for 5 s after splitting the basal ends. Plant cuttings in the nursery after bottom heat (±21∘𝐶) for 2 weeks. If conditions for field planting is unfavourable, cuttings can be stored for up to 3 weeks in either a plastic tunnel or cold store (4∘𝐶) without affecting survival negatively. Masters 2012-08-27T11:36:49Z 2012-08-27T11:36:49Z 1995 Thesis http://hdl.handle.net/10019.1/54933 en Stellenbosch University 88 pages : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Plant propagation Stone fruit -- Propagation Stone fruit -- Rootstocks Dissertations -- Horticulture Du Toit, Jeanne Vegetative propagation of 'GF 677' (P. persica x P. amygdalus) stone fruit rootstock |
| title | Vegetative propagation of 'GF 677' (P. persica x P. amygdalus) stone fruit rootstock |
| title_full | Vegetative propagation of 'GF 677' (P. persica x P. amygdalus) stone fruit rootstock |
| title_fullStr | Vegetative propagation of 'GF 677' (P. persica x P. amygdalus) stone fruit rootstock |
| title_full_unstemmed | Vegetative propagation of 'GF 677' (P. persica x P. amygdalus) stone fruit rootstock |
| title_short | Vegetative propagation of 'GF 677' (P. persica x P. amygdalus) stone fruit rootstock |
| title_sort | vegetative propagation of gf 677 p persica x p amygdalus stone fruit rootstock |
| topic | Plant propagation Stone fruit -- Propagation Stone fruit -- Rootstocks Dissertations -- Horticulture |
| url | http://hdl.handle.net/10019.1/54933 |
| work_keys_str_mv | AT dutoitjeanne vegetativepropagationofgf677ppersicaxpamygdalusstonefruitrootstock |