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Genetic Gain From Breeding acacia auriculiformis In Vietnam

Hai, P.H, and Harwood, C., and Kha, L.D., and Pinyopusarerk, K., and Thinh, H.H., (2008) Genetic Gain From Breeding acacia auriculiformis In Vietnam. Journal of Tropical Forest Science, 20 (4). pp. 313-327. ISSN 0128-1283

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Official URL: http://info.frim.gov.my/cfdocs/infocenter/jtfsonline/jtfs/v20n4/313-327.pdf

Affiliations

Swedish University of Agricultural Sciences, Dept. of Plant Biology and Forest Genetics, Uppsala, Sweden and Forest Science Institute of Vietnam, Research Centre for Forest Tree Improvement
Forest Science Institute of Vietnam, Research Centre for Forest Tree Improvement
CSIRO Forest Biosciences, Australia
CSIRO Forest Biosciences, Australia

Abstract

Seedlots of Acacia auriculiformis collected from a seedling seed orchard (SSO) and an unpedigreed seed production area (SPA) in northern and central Vietnam were compared with a natural-provenance control and a commercial seedlot from Vietnam. Trials were established on lowland sites in central, north-central and northern Vietnam. Four years after planting, overall survival was good to excellent (83–91%). The SSO and SPA seedlots exhibited significantly (p < 0.001) greater height, diameter at breast height (dbh) and stem volume per hectare than the natural provenance controls, which in turn significantly outperformed the local commercial seed source. Conical stem volume in m3 ha-1 at age four years averaged across the three trials was 27.7 for a select SSO seedlot, 23.0 for a select SPA seedlot, 22.3 for a routine SSO seedlot, 19.2 for the natural provenance control and 12.1 for the commercial seedlot. The SSO and SPA seedlots had significantly (p < 0.001) straighter stems and reduced incidence of stem forking than the natural provenance control, which was in turn superior to the commercial seedlot. Relative performance of the seedlots at the three trial sites was very similar, indicating seedlot-by-environment interaction was of no practical significance. Selected clones of A. auriculiformis included in one trial ranked second in height and diameter growth to the select SSO seedlot and displayed the best stem straightness and axis persistence. The increased dbh values of the SSO and SPA seedlots relative to the natural provenance control were consistent with predictions based on genetic parameters derived from the SSO and selection intensities.

Lot biji benih Acacia auriculiformis yang dikumpul dari kebun biji benih anak benih (SSO) dan kawasan pengeluaran biji benih tidak berpedigri (SPA) di utara dan tengah Vietnam dibandingkan dengan kawalan provenans asli serta lot biji benih komersial dari Vietnam. Ujian dijalankan di tapak tanah rendah di tengah, utara-tengah dan utara Vietnam. Empat tahun selepas ditanam, kemandirian keseluruhan dikategorikan sebagai baik hingga sangat baik (83–91%). Lot anak benih SSO dan SPA menunjukkan ketinggian, diameter aras dada (dbh) dan isi padu batang yang secara signifikan (p < 0.001) lebih baik berbanding kawalan provenans asli. Provenans kawalan pula jauh mengatasi prestasi biji benih komersial. Purata isi padu kon batang dalam unit m3 ha-1 pada usia empat tahun ialah 27.7 bagi lot biji benih SSO terpilih, 23.0 bagi lot biji benih SPA terpilih, 22.3 bagi lot biji benih SSO rutin, 19.2 bagi kawalan provenans asli dan 12.1 bagi lot biji benih komersial. Lot biji benih SSO and SPA mempunyai batang yang lebih lurus dan kejadian pencabangan batang yang lebih rendah secara signifikan (p < 0.001) berbanding kawalan provenans asli. Dalam pada itu kawalan provenans asli adalah lebih baik daripada lot biji benih komersial. Performans relatif di ketiga-tiga tapak adalah sama dan ini menunjukkan interaksi biji benih dan persekitaran adalah langsung tidak signifikan. Klon A. auriculiformis terpilih yang dimasukkan dalam satu daripada ujian ini menunjukkan pertumbuhan ketinggian dan diameter yang kedua tertinggi selepas lot biji benih SSO tetapi mempunyai kelurusan batang dan keterusan paksi yang terbaik. Peningkatan dbh lot biji benih SSO dan SPA berbanding dengan kawalan provenans asli menepati ramalan berdasarkan parameter genetik yang diterbitkan daripada keamatan SSO dan keamatan pilihan.

Item Type:Journal
Keywords:Growth, seedlot by environment interaction, seed orchard, seed production area, stem straightness
Subjects:S Agriculture, Forestry
ID Code:8589

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