Summary of doctoral thesis: Study on growth characteristics, wood properties and sterility of triploid acacias providing scientific bases for breeding and afforestation

Objectives of the study: Determining the growth characteristics and adaptability of some triploid acacia clones in 3 ecological regions (Northeast, North Central and Southeast); đetermine the basic wood properties for some promising triploid acacia clones; identify some reproductive characteristics of some triploid acacia clones
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Summary of doctoral thesis: Study on growth characteristics, wood properties and sterility of triploid acacias providing scientific bases for breeding and afforestation MINISTRY OF EDUCATION MINISTRY OF AGRICULTURE AND TRAINING AND RURAL DEVELOPMENT VIETNAMESE ACADEMY OF FOREST SCIENCES ---------    --------- PHAM VAN BON STUDY ON GROWTH CHARACTERISTICS, WOOD PROPERTIES AND STERILITY OF TRIPLOID ACACIAS PROVIDING SCIENTIFIC BASES FOR BREEDING AND AFFORESTATION Speciality: Forest tree genetics and breeding Code: 9 62 02 07 SUMMARY OF DOCTORAL THESIS Ha Noi, 2021 Hanoi - 2020 This work has been completed at the Vietnamese Academy of Forest Sciences Supervisors: 1. Dr. Ha Huy Thinh 2. Dr. Nghiem Quynh Chi TS. Phí Hồng Hải Chairman: Assoc. Prof. Dr. Phi Hong Hai Reviewer 1: Assoc. Prof. Dr. Pham Duc Tuan Reviewer 2: Assoc. Prof. Dr. Nguyen Van Viet Reviewer 3: Dr. Doan Ngoc Dao The thesis was defended in front of the institute’s thesis-judging council meeting at the Vietnamese Academy of Forest Sciences at the hour minute day month year 2021 The thesis can be referred at the National Library of Vietnam and the Vietnamese Academy of Forest Sciences PUBLISHED SCIENTIFIC PAPERS RELATED TO THE THESIS 1. P. V. Bon, C. E. Harwood, Q. C. Nghiem, H. H. Thinh, D. H. Son and N. V. Chinh (2020), “Growth of triploid and diploid Acacia clones in three contrasting environments in Viet Nam”, Australian Forestry 83(4): 265-274. https://doi.org/10.1080/00049158.2020.1819009. 2. Bon PV, Harwood CE, Chi NQ, Thinh HH and Kien ND (2020), “Comparing wood density, heartwood proportion and bark thickness of diploid and triploid acacia hybrid clones in vietnam”, Journal of Tropical Forest Science 32(2), pp. 206-216. https://doi.org/10.26525/jtfs32.2.206. INTRODUCTION 1. Rationale Developing mono species plantation with large scale, acacia plantation in Vietnam have been meeting high risk of disease, especially wilt disease caused by Ceratocytis sp and pink disease caused by Corticium samonicolor, leading to seriously reducing wood productivity of plantation. Another thing has been receiving attention from experts, some acacia species may become invading grasses competing with indigenous species, requiring further work on breeding Acacia varieties is being carried out in order to create varieties of acacia that are able to limit the risks for acacia plantations in the future. In addition to continuing to research and select acacia varieties according to traditional methods, the triploid acacia breeding method is considered a new and highly practical direction. The triploid acacia variety is expected to have fast growth, good adaptability, improved wood quality and especially poor fertility, so the above risks can be minimized for acacia plantations. In Vietnam, research on triploid breeding for some commercially valuable acacia species such as Acacia mangium, A. acacia and A. hybrid has been carried out since 2002, so far, some important results have been obtained such as: developed method of selection, breeding and propagation of triploid acacias; some created triploid acacia clones and initially selected a number of promising triploid hybrid acacia clones to put into production. Inheriting a part of the results of the project: Research on selection and breeding of fast-growing triploid acacia for large timber plantations and additional research on wood properties and infertility of triploid acacia in the trials has been established, the thesis Study on growth characteristics, wood properties and infertility of triploid acacia as a basis for breeding and afforestation was carried out in order to supplement the scientific basis for further research and development of triploid acacia cultivars in Vietnam. 2. Study objectives  General objectives 1 Identify the elite characteristics of triploid acacia varieties as the basis for breeding and afforestation.  Specific objectives + Determining the growth characteristics and adaptability of some triploid acacia clones in 3 ecological regions (Northeast, North Central and Southeast). + Determine the basic wood properties for some promising triploid acacia clones. + Identify some reproductive characteristics of some triploid acacia clones 3. Study materials and range  Study materials Used materials in this study included 10 triploid Acacia hybrid clones, 4 triploid A. auriculiformis and 7 diploid A. hybrid and A. auriculiformis clones which were approved as national or advanced cultivars. More detail information as below table. Genetic informations Order Clone Ploidy Code Mother Father 1 X101 3x AM A. auriculiformis 2x (Aa6) A. mangium 4x (Am44) 2 X102 3x AM A. auriculiformis 2x (Aa6) A. mangium 4x (Am44) 3 X201 3x AM A. auriculiformis 2x (Aa6) A. mangium 4x (Am36) 4 X204 3x AM A. auriculiformis 2x (Aa6) A. mangium 4x (Am36) 5 X205 3x AM A. auriculiformis 2x (Aa6) A. mangium 4x (Am36) 6 X01 3x MA A. mangium 4x Unknown 7 X11 3x MA A. mangium 4x Unknown * 8 X1100 3x MA A. ...