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The use of field and artificial freezing studies to assess frost tolerance in natural Pinus oocarpa populations and P. patula x P. tecunumanii hybrid families
Dissertation (MSc (Forest Science))--University of Pretoria, 2018.
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| Format: | Thesis |
| Language: | English |
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2026
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| _version_ | 1867613600816824320 |
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| access_status_str | Open Access |
| author2 | Chirwa, Paxie W. |
| author_browse | Chirwa, Paxie W. |
| author_facet | Chirwa, Paxie W. |
| collection | Thesis |
| description | Dissertation (MSc (Forest Science))--University of Pretoria, 2018. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/110033 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:38:43.836Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2026 |
| publishDateRange | 2026 |
| publishDateSort | 2026 |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/110033 The use of field and artificial freezing studies to assess frost tolerance in natural Pinus oocarpa populations and P. patula x P. tecunumanii hybrid families Chirwa, Paxie W. ldewall@york.co.za Mitchell, Glen De Wall, Lizette Frost tolerance Artificial freezing Field assessment Dissertation (MSc (Forest Science))--University of Pretoria, 2018. Until recently, Pinus patula was the most widely planted pine species in the eastern regions of South Africa. This was mainly due to its good growth and wood properties. Since the arrival of the Pitch Canker Fungus, Fusarium circinatum, in South Africa in the early 1990’s, the survival of P. patula seedlings in commercial nurseries and in-field after establishment, has been severely affected. In addition, the effects of global warming mean that P. patula may no longer be as productive on sites where it was grown previously. Due to these factors, tree breeders have created hybrids between P. patula and more tropical pine species, such as P. tecunumanii and P. oocarpa, in an effort to produce a new genotype with good growth, wood properties, tolerance to F. circinatum infection and adaptability to a changing climate. Although these hybrids have shown significantly improved growth and tolerance to F. circinatum over P. patula, their wide-spread commercial deployment has been limited due to their lack of tolerance to frost. Hence, the relative tolerance of P. oocarpa provenances (representing Mexico, Guatemala, Honduras and Nicaragua) to frost in South Africa, was assessed by: scoring field damage and survival after frost events (8 provenances); damage to plant tissue through electrolyte leakage tests and scoring damage to plants after whole plant freezing (17 provenances). There were significant (p Plant and Soil Sciences MSc (Forest Science) 2026-05-15T17:26:07Z 2026-05-15T17:26:07Z 18/04/20 2018 Dissertation http://hdl.handle.net/2263/110033 en application/pdf |
| spellingShingle | Frost tolerance Artificial freezing Field assessment The use of field and artificial freezing studies to assess frost tolerance in natural Pinus oocarpa populations and P. patula x P. tecunumanii hybrid families |
| title | The use of field and artificial freezing studies to assess frost tolerance in natural Pinus oocarpa populations and P. patula x P. tecunumanii hybrid families |
| title_full | The use of field and artificial freezing studies to assess frost tolerance in natural Pinus oocarpa populations and P. patula x P. tecunumanii hybrid families |
| title_fullStr | The use of field and artificial freezing studies to assess frost tolerance in natural Pinus oocarpa populations and P. patula x P. tecunumanii hybrid families |
| title_full_unstemmed | The use of field and artificial freezing studies to assess frost tolerance in natural Pinus oocarpa populations and P. patula x P. tecunumanii hybrid families |
| title_short | The use of field and artificial freezing studies to assess frost tolerance in natural Pinus oocarpa populations and P. patula x P. tecunumanii hybrid families |
| title_sort | use of field and artificial freezing studies to assess frost tolerance in natural pinus oocarpa populations and p patula x p tecunumanii hybrid families |
| topic | Frost tolerance Artificial freezing Field assessment |
| url | http://hdl.handle.net/2263/110033 |