Fertility Variation and Genetic Diversity in a Clonal Seed Orchard of Cryptomeria japonica

Kang, Kyu-Suk; El‐Kassaby, Yousry A.; Chung, M. S.; Kim, C. S.; Kang, Young-Je; Kang, Beom-Soo

doi:10.1515/sg-2005-0016

Cited by 9 publications

(4 citation statements)

References 15 publications

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“…On the other hand, if all clones contribute equally (e.g., 1/N) to both female and male strobili production, then this is perfect sexual equilibrium. However, the complete sexual balance is rarely met in real conditions of seed orchards (Kang et al, 2005;Na et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

Clonal fertility and heritability in strobilus production, and gene diversity of seed crops in a second-generation seed orchard of Pinus thunbergii

Park

Kim

et al. 2023

Silvae Genetica

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Variation of female and male strobilus production among clones over 4 consecutive years was estimated, and genetic variance, heritability, and genetic correlation in strobilus production were investigated in the second-generation seed orchard of Pinus thunbergii. This seed orchard was created with grafts selected according to the volume growth of their offspring. The production of female strobili continued to increase, whereas the production of male strobili fluctuated throughout the investigated period. The number of female strobili was highest in rich cone years, but the production of male strobili was not the same in rich or poor years. The maleness index showed a balance between female and male parents that occurred when male strobilus production was in rich or poor years. The parental balance curve for female strobilus production was closer to the expectation (i.e., more equal contribution) than that for male strobilus production in all years. The analysis of variance revealed significant differences among clones in female and male strobilus production over the four-year period. The narrow-sense heritability was higher in male strobilus production than female strobilus, implying that male strobilus production was under genetic control. The Pearson’s correlation was positive and mostly significant, indicating that female strobilus production was reflected in male strobilus production. The effective parent number was lowest in moderate and good years for cone production. The loss of gene diversity in seed crops was lower than expected based on clonal fertility variation.

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Section: Discussionmentioning

confidence: 99%

Clonal fertility and heritability in strobilus production, and gene diversity of seed crops in a second-generation seed orchard of Pinus thunbergii

Park

Kim

et al. 2023

Silvae Genetica

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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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“…Consequently, small numbers of clones produce most of the flowers or seeds in the orchard, resulting in a loss of genetic diversity. Kang et al (2005) stated that a loss in genetic diversity was expected due to the accumulation of relatedness or fertility variation. A reduction in genetic diversity in orchard crops affects the level of genetic diversity in seedlings and, subsequently, in the plantation forest.…”

Section: Fertility Variation and Status Numbermentioning

confidence: 99%

Genetic Diversity of Seed Orchard Crops

Ertekin¹

2012

The Molecular Basis of Plant Genetic Diversity

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Fertility Variation and Genetic Diversity in a Clonal Seed Orchard of Cryptomeria japonica

Cited by 9 publications

References 15 publications

Clonal fertility and heritability in strobilus production, and gene diversity of seed crops in a second-generation seed orchard of Pinus thunbergii

Clonal fertility and heritability in strobilus production, and gene diversity of seed crops in a second-generation seed orchard of Pinus thunbergii

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

Genetic Diversity of Seed Orchard Crops

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