Genetic parameters of red mahogany breeding populations grown in the tropics

Brawner, Jeremy; Bush, David R.; Warburton, Paul; Clegg, P. A.

doi:10.1080/00049158.2010.10676324

Cited by 25 publications

(17 citation statements)

References 8 publications

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“…This approach was intended to produce unbiased heritability estimates, which account for genotype by environment (G×E) variance, and provide a single acrosssites heritability estimate for comparison (Hodge and White 1992;Brawner et al 2010). The across-sites proportion of provenance variance P 2 a was estimated following Eq.…”

Section: Derivation Of Genetic Parametersmentioning

confidence: 99%

Relationships between early growth and Quambalaria shoot blight tolerance in Corymbia citriodora progeny trials established in Queensland, Australia

Brawner

Lee

Hardner

et al. 2011

Tree Genetics & Genomes

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The fungal pathogen Quambalaria pitereka can cause significant damage to spotted gum (Corymbia sp.) plantations in Australia. A series of seven progeny trials, involving seed from a range-wide collection from 527 individuals within 25 native populations of Corymbia citriodora sub-species variegata, were assessed for height growth and damage from Quambalaria around 1 year after planting. Infection at this young age has been found to detrimentally impact growth, form, and wood quality for many years. Genetic variance was found to be significant at both the provenance and family level. However, selection of families within provenances should lead to greater levels of genetic gain than what can be realized from selecting among provenances as estimates of additive genetic variance were consistently greater than estimates of variance among populations. Strong relationships between height and Quambalaria shoot blight (QSB) damage assessments in these trials were evidenced by very high genetic correlations between the traits; therefore, selection for any of these traits could be used to identify more productive and QSB-tolerant populations. While both provenances and families were found to interact with the trial environments at a similar level across traits, genetic correlations indicated that rankings for growth were be less stable than rankings for QSB tolerance across environments. Genetic parameter estimates derived from general and generalized linear models were very similar and either analytical method could be used to evaluate fungal damage.

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Section: Derivation Of Genetic Parametersmentioning

confidence: 99%

Relationships between early growth and Quambalaria shoot blight tolerance in Corymbia citriodora progeny trials established in Queensland, Australia

Brawner

Lee

Hardner

et al. 2011

Tree Genetics & Genomes

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“…However, the current across-trial (or unbiased) heritability estimates found for DBH are somewhat greater than those previously reported, with a range of 0.30 ± 0.13 to 0.41 ± 0.12 compared with 0.22 to 0.25 at six years of age (Leksono et al 2006), and 0.15 to 0.25 (Leksono et al 2008) and 0.15 to 0.33 (Brawner et al 2010) at younger ages (one to three years of age). A reason for this may be the use of one-third rather than one-quarter for the coefficient of relationship (Hodge et al 2002).…”

Section: Genetic Parameter Estimatescontrasting

confidence: 50%

“…Consequently, E. pellita is currently one of the main species used in afforestation in several countries (Harwood 1998;Leksono et al 2008;Clarke et al 2009;Brawner et al 2010). In…”

Section: Introductionmentioning

confidence: 99%

NIR for combined selection in hardwoods for both growth and wood properties

Tran¹

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of a thesis submitted to The University of Queensland for the degree of Doctor of Philosophy Near infrared (NIR) spectroscopy provides an inexpensive and rapid alternative to traditional laboratory methods for estimation of wood properties. Its advantages are well-known as an appropriate approach for tree improvement programs where assessment of a large number of trees is usually required and elite individual trees need to be retained for use as future parents. Hence, tree breeders are beginning to realise the potential of this technology for the selection of species, taxa, provenances, families and individual trees with superior wood quality.Forest products are consumed worldwide for multiple purposes to support daily living. Many of these products are sourced from planted forests. In north-eastern Australia large areas of hardwood plantations have been established in the last 15 years; however, due to poor tree species selection, significant areas have failed. Research to support hardwood plantation development in north eastern Australia included the establishment of taxa trials across multiple sites in Queensland and northern New South Wales. Previous work involving this trial network focused primarily on the growth and survival of the various taxa and species included, and identified a number of promising species, including Corymbia citriodora subsp. variegata (CCV) and Eucalyptus pellita. In this thesis, the initial focus was to evaluate the most promising hardwood taxa across a subset of well-replicated and linked trials, to identify the taxa most suitable for solid wood and pulpwood production across the diverse environments of north-eastern Australia. The second focus was to assess open-pollinated families within different provenances (or seed sources) in two key studied species (CCV and E. pellita) to investigate the genetic control of key wood properties, and relationships among wood and growth traits. Here near infrared spectroscopy was used to rapidly and cost effectively assess the wood properties of these taxa across multiple trial sites and methods developed to deal with unbalanced representation of taxa/species across and within trials. This thesis aims to address the following research questions: hierarchical clustering to facilitate grouping of trials into classes based on similarity in the performance of individual taxa; and, principal component analysis to analyse the pattern of performance across sites. Finally, a deterministic simulation was constructed to demonstrate the impact of different weightings for each trait on predicted genetic gains in both CCV and E. pellita.After the initial introduction chapter, the second chapter of the thesis provides information on the productivity and wood properties of examined species/taxa, thence a more robust basis for taxa selection across geographical locations in north-eastern Australia during the first 10 years of age can be better understood. The third and fourth chapters investigate a range of genetic parameterestimates based on open-pol...

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“…Terdapat peningkatan luas hutan tanaman ekaliptus yang cukup signifikan di dunia dan saat ini tercatat mencapai 20 juta hektar (Harwood et al, 2015). Eucalyptus pellita merupakan salah satu spesies ekaliptus yang banyak ditanam di Indonesia, dan upaya peningkatan produktivitasnya terus ditingkatkan baik melalui pemuliaan generasi tingkat lanjut maupun aplikasi silvikultur intensif (Brawner, Bush, Macdonell, Warburton, & Clegg, 2010;Hardiyanto, 2003;Hung et al, 2014;Kurinobu & Rimbawanto, 2002;Pinyopusarerk & Harwood, 2010). Sebagai antisipasi penanaman E. pellita pada berbagai kondisi lahan tanam yang bervariasi (iklim, jenis dan kesuburan tanah), kegiatan pemuliaan tanaman dilaksanakan melalui pembangunan plot uji keturunan di beberapa lokasi dengan kondisi lingkungan yang berbeda.…”

Section: Pendahuluanunclassified

“…Namun demikian observasi interaksi famili × lokasi belum dilaporkan pada uji keturunan generasi kedua. Disamping perbedaan karena lokasi pengujian, efek dari seleksi selama siklus pemuliaan generasi pertama diduga juga akan memberikan pengaruh terhadap besarnya interaksi famili × lokasi pada pemuliaan generasi kedua (Brawner et al, 2010).…”

Section: Pendahuluanunclassified

INTERAKSI FAMILI × LOKASI PADA UJI KETURUNAN GENERASI KEDUA Eucalyptus pellita

Mangkuwibowo

Indrioko

Nirsatmanto³

2018

JPTH

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The interaction assessment of genotype and environment is necessary to find out an effective selection strategy in progeny trial, particularly in advanced generations. This study aims to observe the effect of family × site interaction in second generation progeny trial of Eucalyptus pellita planted at two locations: Wonogiri, Central Java and Pelaihari, South Kalimantan. The trials design were completely randomized block design (CRBD) with 49 families, 6-10 blocks, 5 tree-plot and 4 m × 1.5 m spacing. Data measurements included height, diameter at breast height, and stem volume at two and four years age. The study results showed that the families had significant differences (p<0.01) for all measured traits at two and four years age, but the family and site interaction was not statistically significant. Family heritability across the two sites were moderate to high for all traits with the type B genetic correlation ranged from 0.67 to 0.94. Heritability and genetic correlation tended to be higher as tree getting older. Less than 16% of families showed an interactive rank changes in the two locations based on multiple-traits selection index. In general, family selection by combining data from the two sites of progeny trial provided higher genetic gain than those by indirect selection, but it was varied to those direct selection on each site. Therefore, these results imply that, the strategy for family selection by combining data from the two sites of progeny trials should be practiced in appropriate combination and direction by considering the magnitude of genetic variation. ABSTRAKPengaruh interaksi genotipe dengan lingkungan perlu diamati untuk menetapkan strategi seleksi yang efektif dalam plot uji keturunan, khususnya pada generasi tingkat lanjut. Penelitian ini bertujuan untuk melakukan pengamatan pengaruh interaksi famili × lokasi pada uji keturunan generasi kedua jenis Eucalyptus pellita yang dibangun di dua lokasi: Wonogiri, Jawa Tengah dan Pelaihari, Kalimantan Selatan. Sebanyak 49 famili diuji menggunakan rancangan acak lengkap berblok (RALB), 6-10 blok, 5 pohon per plot dan jarak tanam 4 m × 1,5 m. Pengukuran data meliputi tinggi, diameter setinggi dada, dan volume batang pada umur 2 dan 4 tahun. Hasil penelitian menunjukkan bahwa famili yang diuji berbeda nyata (p<0,01) pada seluruh sifat yang diamati, sedangkan interaksi famili × lokasi tidak berbeda nyata. Nilai heritabilitas famili berkisar sedangtinggi pada semua sifat dengan nilai Tipe B korelasi genetik berkisar 0,67 -0,94. Nilai heritabilitas dan korelasi genetik cenderung semakin tinggi seiring dengan bertambahnya umur tanaman. Kurang dari 16% dari famili yang diuji menunjukkan perubahan rangking yang interaktif antarlokasi berdasarkan nilai indeks seleksi multi-sifat. Secara umum seleksi famili berdasarkan gabungan data dari kedua lokasi plot uji keturunan menunjukkan nilai perolehan genetik yang lebih tinggi dibandingkan seleksi tidak langsung, namun bervariatif terhadap seleksi langsung pada masing-masing lokasi. Hal ini memberikan implikasi ...

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Genetic parameters of red mahogany breeding populations grown in the tropics

Cited by 25 publications

References 8 publications

Relationships between early growth and Quambalaria shoot blight tolerance in Corymbia citriodora progeny trials established in Queensland, Australia

Relationships between early growth and Quambalaria shoot blight tolerance in Corymbia citriodora progeny trials established in Queensland, Australia

NIR for combined selection in hardwoods for both growth and wood properties

INTERAKSI FAMILI × LOKASI PADA UJI KETURUNAN GENERASI KEDUA Eucalyptus pellita

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