Tree Genetics & Genomes

Journal Information
ISSN / EISSN : 1614-2942 / 1614-2950
Published by: Springer Nature (10.1007)
Total articles ≅ 1,532
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Carl Barker, , Paul Ashton
Published: 29 April 2022
Tree Genetics & Genomes, Volume 18, pp 1-16; https://doi.org/10.1007/s11295-022-01553-y

Abstract:
Facultative clonality is extremely common in plants, but the relative emphasis on sexual versus asexual reproduction varies both between and within species, which in turn may influence individual fitness and population persistence. Tilia cordata is a temperate, entomophilous canopy tree that is partially clonal. Favourably warm climatic conditions have been linked with successful sexual reproduction in the species with clonality being suggested as the reason for population persistence in colder periods. Despite this the extent, character and structure of asexual reproduction in the species have never been described, nor has its relationship with climate. Fine-scale spatial genetic structure was assessed in 23 stands across a latitudinal gradient. The proportion of individuals that are of clonal origin has a wide range with a mean of ~43%. Genetic diversity is high, with even mostly clonal stand possessing several distinct genotypes. A beta regression model shows that historic summer temperatures and density of recent recruits are predictors of the proportion of clonal recruitment. Clonal reproduction is less important in stands that experience higher temperatures during flowering while stands with more saplings have more clones. Additional factors likely affect the balance between the two reproductive modes. The climatic relationship suggests a trend towards a higher proportion of recruitment from seed in a warming climate, although factors such as herbivory may prevent this.
Cheng Zhang, Shi-Qi Li, Huan-Huan Xie, Jian-Quan Liu,
Published: 25 April 2022
Tree Genetics & Genomes, Volume 18, pp 1-17; https://doi.org/10.1007/s11295-022-01549-8

The publisher has not yet granted permission to display this abstract.
, Sri Sunarti, Arif Nirsatmanto, Heru Indrayadi, Marthin Tarigan, Muhammad Yuliarto, Sri Rahayu, Eko Bhakti Hardiyanto, Morag Glen, Caroline Mohammed, et al.
Published: 25 March 2022
Tree Genetics & Genomes, Volume 18, pp 1-11; https://doi.org/10.1007/s11295-022-01548-9

Abstract:
Three screening trials of clonally replicated Acacia mangium seedlings were evaluated for survival and lesion length following inoculation with locally collected strains of Ceratocystis in Indonesia. Tolerance in the population was low with 6.7% of the 1033 clones represented by more than 4 ramets surviving repeated inoculations. Differences in tolerance among populations were slight; however, populations with consistently higher survival and shorter lesion lengths were from Papua New Guinea rather than Queensland. Estimates of the proportion of the experimental variation attributable to differences among parents (heritability) were low to moderate for both survival and lesion length. Estimates of the proportion of the experimental variation that was attributable to differences among clones (repeatability) were greater but typically similar to the heritability estimates, indicating that initial improvements from selection will primarily be derived from identifying tolerant parents. While genetic correlations among experiments were positive, estimates could not exclude the existence of host–pathogen interactions. Two validation trials of the tolerant clones were assessed 9 months after establishment; these trials verified that one-third of the clones identified in the nursery screening were also tolerant to Ceratocystis in field trials. The experiments confirmed that nursery screening may be used to quickly focus efforts on parents that produce more tolerant progeny, screening additional seedlings to increase selection intensity rather than using clonal replication to increase accuracy would lead to greater improvements in tolerance and field trials are required to verify disease tolerance at later ages.
Mary Ranketse, Charles A. Hefer, Rian Pierneef, Gerda Fourie,
Published: 15 March 2022
Tree Genetics & Genomes, Volume 18, pp 1-12; https://doi.org/10.1007/s11295-022-01543-0

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, Jean-Marc Bouvet, Julien Frouin, Iraê Amaral Guerrini, Talitha Casella Moreira de Freitas, Magali Ribeiro da Silva, Jean-Pierre Bouillet, Jean-Paul Laclau, Celso Luis Marino
Published: 8 March 2022
Tree Genetics & Genomes, Volume 18, pp 1-17; https://doi.org/10.1007/s11295-022-01546-x

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, Katrin Heer, Pascal Milesi, Martina Peter, Tanja Pyhäjärvi, Marjana Westergren, Christian Rellstab, Felix Gugerli
Published: 9 February 2022
Tree Genetics & Genomes, Volume 18, pp 1-7; https://doi.org/10.1007/s11295-022-01542-1

Abstract:
Rapid human-induced environmental changes like climate warming represent a challenge for forest ecosystems. Due to their biological complexity and the long generation time of their keystone tree species, genetic adaptation in these ecosystems might not be fast enough to keep track with conditions changing at such a fast pace. The study of adaptation to environmental change and its genetic mechanisms is therefore key for ensuring a sustainable support and management of forests. The 4-day conference of the European Research Group EvolTree (https://www.evoltree.eu) on the topic of “Genomics and Adaptation in Forest Ecosystems” brought together over 130 scientists to present and discuss the latest developments and findings in forest evolutionary research. Genomic studies in forest trees have long been hampered by the lack of high-quality genomics resources and affordable genotyping methods. This has dramatically changed in the last few years; the conference impressively showed how such tools are now being applied to study past demography, adaptation and interactions with associated organisms. Moreover, genomic studies are now finally also entering the world of conservation and forest management, for example by measuring the value or cost of interspecific hybridization and introgression, assessing the vulnerability of species and populations to future change, or accurately delineating evolutionary significant units. The newly launched conference series of EvolTree will hopefully play a key role in the exchange and synthesis of such important investigations.
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