Options for converting a clone trial of Eucalyptus camaldulensis into a clonal seed orchard considering gain, fertility and effective clone number

Kamalakannan, R.; Varghese, M.; Suraj, P. G.; Arutselvan, T.

doi:10.1007/s11676-015-0169-y

Cited by 8 publications

(9 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…to supply forest product demand. It also accorded well with the active keyword "Eucalyptus niten" in Figure 8 and recent papers in seed orchards of these species (i.e., [28,42]). However, they could be checked periodically to give future directions in the seed orchard field.…”

Section: Discussionsupporting

confidence: 86%

Bibliometric Analysis of Trends and Future Directions of Research and Development of Seed Orchards

Yardibi,

Kang,

Özbey

et al. 2024

Forests

View full text Add to dashboard Cite

Seed orchards are important seed resources for producing improved tree crops for future plantations, forest restoration, and forestry practices (i.e., gene conservation) and for transmitting current gene diversity to future generations. Seed orchards are a major sub-division in forest science. The establishment and management of a seed orchard involves many steps, from the selection of superior trees to the harvesting of a seed crop. Studying the trends and future directions of seed orchards using different analysis methods is critically important, especially to establish resistant forests via the production of climate-smart, biotic/abiotic-stress-resistant seedling materials. Published papers related to seed orchards should be analyzed to determine the current trends in this field and to contribute to its future directions. Bibliometric analysis has been used for different purposes in various scientific fields. However, it has not been performed for publications in seed orchards. This study was carried out to analyze the current trends of research on seed orchards and to determine the future directions of these orchards based on published papers. For these purposes, 1018 published papers were obtained from the Science Citation Index, Science Citation Index Expanded, and citation index databases of “Web of Science” using the keyword “seed orchard”. The papers were published between 1980 and 2022 and were subjected to bibliometric analysis based on the most prolific contributors, references, countries, and keywords. CiteSpace software 6.1 R6 was applied to visualize information about seed orchard research. The average number of citations per publication was 13.05, and the 4 H-Index of the publication set was 48. The most prolific contributors with the strongest citation bursts, the highest centrality, and the greatest numbers of published papers were from Canada, Sweden, South Korea, Finland, and Czech Republic, while Canada (186 published articles), the USA (140), and Sweden (115), together with China, Brazil, and Germany, were active countries, especially based on citations from recent years. The “keywords” of the papers were the core of the research. “Mating pattern”, “Swedish forestry”, “fertility variation”, “Hymenoscyphus fraxineus”, “threatened Pacific sandalwood”, “outbreeding depression”, “climate change”, “management”, and “growth”, together with others such as “genetic improvement” and “effective size”, were active study areas and keywords, based on results of the analysis. They also guided the literature search and inventory and classification of early studies and served as predictors for future studies. The results of this study are discussed based on the trends and future directions of the research and development of seed orchards.

show abstract

Section: Discussionsupporting

confidence: 86%

Bibliometric Analysis of Trends and Future Directions of Research and Development of Seed Orchards

Yardibi,

Kang,

Özbey

et al. 2024

Forests

View full text Add to dashboard Cite

show abstract

“…Effective population size and predicted gene diversity of CSO 1 were lower than that of SPAs, but genetic diversity was on par with SPA 3 due to low sibling coefficient and balanced contribution from most clones. Kamalakannan et al (2016) reported low fertility variation (Ψ=1.4) in a clone trial (80 % contribution from 55 % genotypes) of 40 E. camaldulensis clones, which is in line with the trend observed in CSO 1. Fertility variation in seed stands is generally higher than that in clonal orchards (Kang et al 2003).…”

Section: Impact Of Fertility Variation On Gene Diversitysupporting

confidence: 85%

“…Loss of diversity and increase in relatedness are expected in advanced stages of improvement (Johnson et al, 2001). As relatedness increases beyond a certain point, depending on deviation from random mating, the expected benefits may not be obtained (Kamalakannan et al, 2016). Inbreeding can build up if seeds from very few mother trees are used to establish a stand, and next generation will be derived from mating between close relatives.…”

Section: Discussionmentioning

confidence: 99%

“…Poor correlation between growth and wood traits (Hung et al, 2015) also makes it necessary to decide the intensity of selection for arriving at an optimal improvement strategy for traits of interest. Kamalakannan et al (2016) developed a strategy to optimize gain and effective clone number in a CSO of E. camaldulensis.…”

Section: Trade-off Between Genetic Diversity and Phenotypic Traitsmentioning

confidence: 99%

See 1 more Smart Citation

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…on size, the pure natural stands can serve directly as seed production areas followed by thinning. Kamalakannan et al (2015b) had tried this option in a clonal trial of E. camaldulensis and worked out the possibility of converting into a clonal seed orchard. In their evaluation, it was recommended that the trial could be converted into a clonal seed orchard after selective hanced to 52 % from the earlier 30 % based on the fertility of retained trees.…”

Section: Implications On Future Management and Breedingmentioning

confidence: 99%

Fertility variation among individuals in natural stands of Acacia leucophloea

et al. 2016

Self Cite

View full text Add to dashboard Cite

Growth characteristics and fertility variations were evaluated at four natural stands of tropical arid zone species,A. leucophloeain southern India. Three stands (TNL 1, TNL 2 and PDM) were situated in dry upland regions while one stand (RKP) was at waterlogged site. The tree height and girth at breast height did not vary between stands in two years. Fertility variation (sibling coefficient, ψ) was estimated based on flowering abundance and fruit set collected for two consecutive years. Fruit production per tree was generally lower in the RKP stand than the other three stands. No year-to-year variation was observed on fruit set in all stands. Growth and flower production showed a weak-positive correlation in both years (R2= 0.39 to 0.1). The correlation to check if the larger inflorescence size, the higher number of fruit production was also failed. Male fertility variation did not vary much among stands (ψm= 1.28 ~ 1.62). Female fertility variation was low (ψf= 1.71 ~ 2.02) in the three stands situated in dry upland regions than the RKP stand (ψf= 4.09 ~ 4.16). The cumulative contribution of trees to the overall fertility was deviated from the ideal situation (equal contribution) in all stands, especially the RKP stand showed a skewed distribution (R2≤ 6.5). The effective population size was low in the RKP predicting a high genetic drift when compared with other sites. Similarly high group coancestry and low gene diversity were observed in the stand RKP. The implications of fertility variation on gene diversity of the species and future management of the natural stands were also discussed.

show abstract

Options for converting a clone trial of Eucalyptus camaldulensis into a clonal seed orchard considering gain, fertility and effective clone number

Cited by 8 publications

References 10 publications

Bibliometric Analysis of Trends and Future Directions of Research and Development of Seed Orchards

Bibliometric Analysis of Trends and Future Directions of Research and Development of Seed Orchards

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

Fertility variation among individuals in natural stands of Acacia leucophloea

Contact Info

Product

Resources

About