Genetic worth and diversity across 18 years in a Nordmann fir clonal seed orchard

Nielsen, Ulrik B.; Hansen, Jon Kehlet

doi:10.1007/s13595-011-0159-y

Cited by 8 publications

(3 citation statements)

References 20 publications

(40 reference statements)

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“…This method allows for the assessment of germplasm, trace the transmission of genetic diversity from parent to offspring, and to perform selective breeding of forested species. (Nielsen and Hansen, 2012;Wojacki et al, 2019;Pakull et al, 2021;Liesebach et al, 2021;Yan et al, 2023).…”

Section: Discussion Discussion Discussionmentioning

confidence: 99%

The growth rate and genetic variability of Scots pine (Pinus sylvestris L.) half-sibs in test crops of Northern Kazakhstan

KREKOVA,

CHEBOTKO,

KAGAN

et al. 2023

Not Bot Horti Agrobo

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Scots pine (Pinus sylvestris L.) is a valuable tree species, playing an important role in maintaining the ecological and economic balance not only in Kazakhstan, but also in many countries around the world. The purpose of this study was to assess the growth rate and to identify the genotypes of the half-sib progeny of Scotch pine plus trees in order to further obtain high-quality seeds with valuable genetic traits. A molecular genetic analysis was carried out using six microsatellite and 20 isoenzyme loci on 15 Scots pine half-sib families, represented by two samples of seeds collected in the subsequent harvesting periods (planted in 1986 and 1987), that evaluated the taxonomic characteristics such as tree height and trunk diameter (DBH, measured at 1.3 meters). Families with the highest growth rate in both samples were selected as candidates for the elite group. During the SSR analysis, a decrease in the level of expected heterozygosity (0.2377-0.5362 with an average value of 0.4593) was observed in P. sylvestris L. half-sibs compared to the sample of maternal plus trees (0.5444), with similar results to that of the “founder effect”. At the same time, the level of observed heterozygosity remained sufficiently high (0.3333-0.7037 with an average value of 0.4980 and 0.4556, respectively). During the isoenzyme analysis, the level of genetic variability either decreased or was similar to that of the maternal trees. Rare and unique alleles were found in seed samples of the analysed tree families. In general, this research showed that a comprehensive evaluation combining both traditional breeding methods (genetic assessment of progeny in the course of growth) and molecular genetic analysis is required for the selection of elite trees.

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Section: Discussion Discussion Discussionmentioning

confidence: 99%

The growth rate and genetic variability of Scots pine (Pinus sylvestris L.) half-sibs in test crops of Northern Kazakhstan

KREKOVA,

CHEBOTKO,

KAGAN

et al. 2023

Not Bot Horti Agrobo

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“…Due to the large variation in the genetic structure of seed crops between years (Nikkanen & Ruotsalainen 2000, Kulková 2007, Nielsen & Hansen 2012, diversity can be preserved by mixing seeds collected in different years (Kang et al 2005). Moreover, collecting seeds from trees of different age groups mimic natural regeneration and increases adaptive potential.…”

Section: Seed Collectionmentioning

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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“…The mating pattern and genetic diversity level of seed orchards largely determine their adaptability, biological and abiotic resistance, and sustainability ( Grattapaglia et al., 2014 ; Chen et al., 2018 ). The mating pattern of a seed orchard is mainly caused by the variation of female and male fertility between parents ( Nielsen and Hansen, 2011 ), the difference in reproductive success rate ( Torimaru et al., 2012 ; Funda et al., 2016 ), the synchronization of the flowering period ( Li et al., 2011 ; Zhang et al., 2016 ; Muñoz-Gutiérrez et al., 2020 ), and the difference in pollen competitiveness ( Nikkanen et al., 2000 ; Aronen et al., 2002 ). However, mating patterns have become more complex due to their expected co-ancestry accumulation in advanced generation breeding programs and seed orchards ( Yang et al., 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Mating pattern and pollen dispersal in an advanced generation seed orchard of Cunninghamia lanceolata (Lamb.) Hook

Zhao²,

Wang³

et al. 2022

Front. Plant Sci.

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Seed orchards represent the link between forest breeding and conifer production forests, and their mating patterns determine the genetic quality of seed orchard crops to a large extent. We genotyped the parental clones and their open pollination offspring in the third-generation seed orchard of Chinese fir using microsatellite markers and observed the synchronization of florescence in the seed orchard to understand the genetic diversity and mating structure of the seed orchard population. Genetic coancestry among parental clones was detected in the third generation seed orchard of Chinese fir, and the genetic diversity of the open-pollinated offspring was slightly higher than that of the parental clones. The external pollen contamination rate ranged from 10.1% to 33.7%, 80% of the offspring were produced by 44% of the parental clones in the orchard, and no evidence of selfing was found. We found that 68.1% of the effective pollination occurred within 50 m, and 19.9% of the effective pollination occurred in the nearest neighbors. We also found that successful mating requires about 30% of florescence overlap between males and females, and there was a significant positive correlation between male reproductive energy and male parental contribution. Our results provide a valuable reference for the management and design of advanced generation seed orchards.

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Genetic worth and diversity across 18 years in a Nordmann fir clonal seed orchard

Abstract: International audienc

Cited by 8 publications

References 20 publications

The growth rate and genetic variability of Scots pine (Pinus sylvestris L.) half-sibs in test crops of Northern Kazakhstan

The growth rate and genetic variability of Scots pine (Pinus sylvestris L.) half-sibs in test crops of Northern Kazakhstan

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

Mating pattern and pollen dispersal in an advanced generation seed orchard of Cunninghamia lanceolata (Lamb.) Hook

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