Changes in genetic diversity parameters in unimproved and improved populations of teak (Tectona grandis L.f.) in Karnataka state, India

Lyngdoh, N.; Joshi, Geeta; Ravikanth, G.; Vasudeva, R.; Shaanker, R. Uma

doi:10.1007/s12041-013-0226-2

Cited by 8 publications

(7 citation statements)

References 17 publications

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“…High genetic diversity can be ensured in SPAs by using bulked seed from a large number of individual trees (Johnson et al, 2001). In a comparative study of teak populations, no significant difference was reported in polymorphic loci between unimproved stands and SPA (Lyngdoh et al, 2013), which is also observed in present study. Thus SPA can be effective in delivering reasonable gain without loss of genetic diversity in seed crop.…”

Section: Genetic Conservation and Mating System In Production Populatsupporting

confidence: 76%

“…Adequate representation from different families will be needed for production of outcrossed seed. Increase in genetic gain is expected with progression from native provenance to seed production area (SPA) and clonal seed orchard (CSO), but the associated loss in diversity is often not evaluated (Lyngdoh et al, 2013). In the current study, genetic diversity (H e ) of SPA 1 was 3 % higher than that of native (NAT) seedlots, whereas ten E. camaldulensis clones of 0.7 % higher absolute pulp yield had almost 30 % lower H e than SPA 1.…”

Section: Discussionmentioning

confidence: 99%

“…A detailed understanding of genetic diversity available in breeding populations is necessary to enhance gain in advanced generations and maintain diversity in planting stock (Johnson et al, 2001). Molecular markers are valuable tools used for characterization and evaluation of genetic diversity within and between populations (Hou et al, 2005), and different levels of improvement (Lyngdoh et al, 2013). Among these markers, microsatellites (simple sequence repeats: SSRs) are widely used due to advantages like high levels of polymorphism, co-dominant nature and high reproducibility (Sumathi and Yasodha, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Impact of fertility variation on genetic diversity and phenotypic traits in second generation seed production areas and clonal seed orchards of Eucalyptus camaldulensis

et al. 2019

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Fertility and gene diversity were estimated in three second generation (F2) seed stands (SPA 1-3) and two clone trials (CSO 1&2) of Eucalyptus camaldulensis to assess the impact on seed crop. F2 seedlots were evaluated in comparison to native provenances, ten commercial clones and interspecific hybrids at diverse sites. SPA 1&2 were genetic gain trials of five first generation (F1) orchard seedlots, SPA 3 a plantation of one F1 orchard seedlot, and CSOs were clone trials of 21 commercial clones established at two contrasting sites. Fertility variation, as indicated by sibling coefficient, was high (Ψ, 9-14) in the SPAs as only about 26 % trees were fertile compared to 81 % trees in CSOs. Effective population size was higher in SPA 1 and 2 (Ns, 95 and 74, respectively) than SPA 3 (Ns = 39). Fertility was highly skewed in CSO 2 resulting in low effective population size (Ns = 2) compared to CSO 1 (Ns = 11). Constant seed collection enabled 3-fold increase in relative population size and 22 % higher predicted gene diversity in CSO 2. Genetic diversity (He) estimated using SSR markers was higher in SPA 1&2 and native provenances (NAT), compared to SPA 3 and CSO 1, whereas CSO 2 and clones had lower values. There was a high positive correlation between estimated He and predicted gene diversity values of SPAs and CSOs. He was positively correlated to mean field survival and negatively correlated to kraft pulp yield (KPY), evaluated at three years in progeny trials across three locations. Number of alleles per locus was higher in SPAs and native provenances compared to CSOs and clones. Discriminant principal component analysis clustered CSO, NAT and SPA seedlots in different groups while commercial E. camaldulensis clones clustered close to NAT. Multilocus outcrossing rate was generally high (tm, 91-100 %), though selfing was observed in two families of SPA 3 and CSO 2. Selected interspecific hybrid families of commercial E. camaldulensis clones (with E. urophylla and E. pellita) evaluated at two of the sites had higher He and KPY than clones at three years.

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Section: Genetic Conservation and Mating System In Production Populatsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of fertility variation on genetic diversity and phenotypic traits in second generation seed production areas and clonal seed orchards of Eucalyptus camaldulensis

et al. 2019

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“…It is often necessary to perform genetic melioration in SS, which include seed trees selection, thinning and other activities that enhance productivity (Mataruga et al 2010). Removing phenotypically inferior trees from SS improves the quality of seeds and seedlings (Sivakumar et al 2011), but may reduce the GD of the next generation (Lyngdoh et al 2013).…”

Section: Seed Productionmentioning

confidence: 99%

Genetic diversity and forest reproductive material - from seed source selection to planting

Ivetić¹,

Devetaković²,

Nonić³

et al. 2016

iForest

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Relation between genetic diversity and mass production of forest reproductive material is discussed in a holistic manner. In industrial forest plantations, narrow genetic diversity is desirable and reproductive material is produced at clone level. On the other hand, in conservation forestry a wide genetic diversity is imperative. Beside management goals, a desirable level of genetic diversity is related to rotation cycle and ontogeny of tree species. Risks of failure are lower in short rotations of fast growing species. In production of slow growing species, managed in long rotations, the reduction of genetic diversity increases the risk of failure due to causes unknown or unexpected at the time of planting. This risk is additionally increased in cases of seed transfer and in conditions of climate change. Every step in production of forest reproductive material, from collection to nursery production, has an effect on genetic diversity mainly by directional selection and should be considered. This review revealed no consistent decrease of genetic diversity during forest reproductive material production and planting.

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“…Teak grows properly within 25-38°C, between 1,250 and 2,500 mm/year of rainfall, presenting the best yields under 600 meters above sea level and produces better wood quality with long dry periods, from 3 to 5 month long (BHAT et al, 2005;MONTEUUIS, 2005;KEOGH, 2009;. This species is the major component Due to its importance, many efforts have focused on the study of teak populations variability (SHRESTHA;VOLKAERT;STRAETEN, 2005;VERHAEGEN et al, 2005;FOFANA et al, 2009;SREEKANTH et al, 2012;LYNGDOH et al, 2013 In most tropical America, including Brazil, harvesting occurs at 20 years, producing small-dimension logs, which are not in demand on the international market (BHAT et al, 2005;. Teak is not a fast growing species but can produce a timber of optimum strength in relatively short rotations of 21 years (BHAT; INDIRA, 1997) depending of the sapwood-heartwood percentages.…”

Section: Introductionmentioning

confidence: 99%

Characterization of genes involved in lignin biosynthesis in Tectona grandis

Gómez¹

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Changes in genetic diversity parameters in unimproved and improved populations of teak (Tectona grandis L.f.) in Karnataka state, India

Cited by 8 publications

References 17 publications

Impact of fertility variation on genetic diversity and phenotypic traits in second generation seed production areas and clonal seed orchards of Eucalyptus camaldulensis

Impact of fertility variation on genetic diversity and phenotypic traits in second generation seed production areas and clonal seed orchards of Eucalyptus camaldulensis

Genetic diversity and forest reproductive material - from seed source selection to planting

Characterization of genes involved in lignin biosynthesis in Tectona grandis

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