Comparison of Genetic Diversity in Naturally Regenerated Norway Spruce Stands and Seed Orchard Progeny Trials

Ruņģis, Dainis; Luguza, Solveiga; Bāders, Endijs; Šķipars, Vilnis; Jansons, Āris

doi:10.3390/f10100926

Cited by 11 publications

(7 citation statements)

References 34 publications

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“…This might be because seed orchards are generally derived from a limited number of clones. The mean He in natural stands (0.718) were slightly higher than in seed orchards (0.700), which is consistent with other studies in Norway (Sønstebø et al, 2018) and Latvia (Ruņgis et al, 2019). Furthermore, the mean He was lower than it was previously 5 reported for Norway spruce core stands in Slovenia (0.935) (Westergren et al, 2018) and Czech Republic (0.780) (Máchová et al, 2018).…”

Section: Genetic Diversitysupporting

confidence: 89%

“…However, there are also data that indicate lower genetic diversity in seed orchards compared to natural populations, as an effect of the number of parents selected for cloning (Johnson and Lipow, 2002;Ilinov and Raevsky, 2017), or studies that report a similar genetic diversity (Ruņgis et al, 2019). Given these differences, we aimed to assess the level of genetic diversity in Norway spruce seed orchards and seed stands in the Eastern Carpathians, a region with a widespread distribution of Norway spruce.…”

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confidence: 99%

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Comparative analysis of genetic diversity in Norway spruce (Picea abies) clonal seed orchards and seed stands

Ciocîrlan

Șofletea

Mihai

et al. 2021

Not Bot Horti Agrobo

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Norway spruce, Picea abies (L.) Karst. is the most important conifer species in Romania and the most planted tree species in the Carpathian Mountains. Here we compare the genetic diversity of four Norway spruce clonal seed orchards and two seed stands located in the Eastern Carpathians. A set of highly polymorphic nuclear microsatellite markers was used. The analysis of genotypic identity of ramets for each Norway spruce clone in all seed orchards indicated that nearly all sampled ramets (97%) were genetically identical. The genetic diversity in seed orchards (He=0.700) was slightly smaller compared to the seed stands (He=0.718). Allelic richness was higher in seed stands (10.874), compared to clonal seed orchards (8.941). The Bayesian analysis indicated a genetic structure with two clusters, one corresponding to the clonal seed orchards and a second one consisting of the two seed stands. Our results provide valuable information for the management of Norway spruce seed orchards in Romania.

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Section: Genetic Diversitysupporting

confidence: 89%

mentioning

confidence: 99%

Comparative analysis of genetic diversity in Norway spruce (Picea abies) clonal seed orchards and seed stands

Ciocîrlan

Șofletea

Mihai

et al. 2021

Not Bot Horti Agrobo

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“…The semi-domesticated population included six provenances with individuals selected from offspring of 200 mother trees (details of the initial collection were reported by Rochon et al [14]), while the cultivated population represented only one provenance and a few mother trees. The number of mother trees used to establish a population is a key factor that affects inbreeding and genetic diversity: a low number will cause inbreeding among progeny, while a large number will increase genetic diversity and reduce differentiation among plantations [44].…”

Section: Discussionmentioning

confidence: 99%

Preliminary Evidence for Domestication Effects on the Genetic Diversity of Guazuma crinita in the Peruvian Amazon

Coral

Čepková

Weber³

et al. 2020

Forests

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Guazuma crinita, a fast-growing timber tree species, was chosen for domestication in the Peruvian Amazon because it can be harvested at an early age and it contributes to the livelihood of local farmers. Although it is in an early stage of domestication, we do not know the impact of the domestication process on its genetic resources. Amplified fragment length polymorphic (AFLP) fingerprints were used to estimate the genetic diversity of G. crinita populations in different stages of domestication. Our objectives were (i) to estimate the level of genetic diversity in G. crinita using AFLP markers, (ii) to describe how the genetic diversity is distributed within and among populations and provenances, and (iii) to assess the genetic diversity in naturally regenerated, cultivated and semi-domesticated populations. We generated fingerprints for 58 leaf samples representing eight provenances and the three population types. We used seven selective primer combinations. A total of 171 fragments were amplified with 99.4% polymorphism at the species level. Nei’s genetic diversity and Shannon information index were slightly higher in the naturally regenerated population than in the cultivated and semi-domesticated populations (He = 0.10, 0.09 and 0.09; I = 0.19, 0.15 and 0.16, respectively). The analysis of molecular variation showed higher genetic diversity within rather than among provenances (84% and 4%, respectively). Cluster analysis (unweighted pair group method with arithmetic mean) and principal coordinate analysis did not show correspondence between genetic and geographic distance. There was significant genetic differentiation among population types (Fst = 0.12 at p ˂ 0.001). The sample size was small, so the results are considered as preliminary, pending further research with larger sample sizes. Nevertheless, these results suggest that domestication has a slight but significant effect on the diversity levels of G. crinita and this should be considered when planning a domestication program.

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“…Similar levels of genetic diversity in seed orchards and their crops are frequently reported, dispelling concern over narrowed genetic base in tree improvement programs. The genetic diversity of the progeny trial corresponded to that of a naturally regenerated stand in Picea sitchensis and Picea abies [ 35 , 36 ]. In addition, the genetic diversity of a plantation with seed orchard crops was not affected by a tree improvement program in Cryptomeria japonica [ 37 ].…”

Section: Discussionmentioning

confidence: 99%

Pedigree reconstruction and spatial analysis for genetic testing and selection in a Larix kaempferi (Lamb.) Carrière plantation

2022

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Background Larix kaempferi is one of the major timber species in Northeast Asia. Demand for the reforestation of the species is rising in South Korea due to an increase in large timber production and utilization. However, progeny trials for the species have not been explored, making it challenging to foster advanced generations of tree improvement. In the present study, genetic testing and selection for diameter growth were conducted using pedigree reconstruction and phenotypic spatial distribution analysis in a plantation of L. kaempferi. The aim of the present study was to select the superior larch individuals using the pedigree reconstruction and phenotypic spatial distribution to substitute progeny trials. The plantation of seed orchard crops was established in 1990 and one-hundred and eighty-eight trees were selected as the study material. Genetic variation was investigated first to validate its adequacy as breeding material. Genetic testing was carried out using a model considering pedigree information and spatial autoregression of the phenotypes. Results The expected heterozygosity of the mother trees and offspring were 0.672 and 0.681 presenting the corresponding level of genetic variation between two groups. The pedigree reconstruction using maternity analysis assigned one to six progenies to ninety-two candidate mothers. The accuracy of genetic testing was exceedingly increased with the animal model considering AR1 ⊗ AR1 structure compared to the animal model only. The estimated genetic variance of the former was 9.086 whereas that of the latter was 4.9E-5 for DBH. The predicted breeding values of the offspring for DBH were ranged from -5.937 cm to 5.655 cm and the estimated heritability of diameter growth was 0.344. Conclusions The genetic testing approach based on pedigree reconstruction and phenotypic spatial distribution analysis was considered a useful analytical scheme that could replace or supplement progeny trials.

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Comparison of Genetic Diversity in Naturally Regenerated Norway Spruce Stands and Seed Orchard Progeny Trials

Cited by 11 publications

References 34 publications

Comparative analysis of genetic diversity in Norway spruce (Picea abies) clonal seed orchards and seed stands

Comparative analysis of genetic diversity in Norway spruce (Picea abies) clonal seed orchards and seed stands

Preliminary Evidence for Domestication Effects on the Genetic Diversity of Guazuma crinita in the Peruvian Amazon

Pedigree reconstruction and spatial analysis for genetic testing and selection in a Larix kaempferi (Lamb.) Carrière plantation

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