Growth and wood properties of natural provenances, local seed sources and clones of Eucalyptus camaldulensis in southern India: implications for breeding and deployment

Varghese, M.; Harwood, Chris; Bush, David R.; Baltunis, Brian S.; Kamalakannan, R.; Suraj, P. G.; Hegde, Deepak V.; Meder, Roger

doi:10.1007/s11056-016-9556-2

Cited by 22 publications

(17 citation statements)

References 13 publications

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“…Cornelius et al (2006) proposed management strategies to conserve genetic diversity for twenty generations of improvement in desired traits. Despite not being typical seed orchards, SPA progeny performed on par or better than commercial clones and native seedlots at diverse sites (Varghese et al, 2017). Further improvement in advanced generations will depend on management of inbreeding and co-ancestry for conserving diversity.…”

Section: Discussionmentioning

confidence: 99%

“…Progeny trials comprising 48 openpollinated seedlots of three SPAs and two CSOs, and 183 native provenance families (Laura river, Kennedy river, Morehead river and Petford) were evaluated at three diverse sites. Phenotypic traits like growth, survival (%) and pulp yield (%) were evaluated in these seedlots at three years, in an earlier study along with 10 commercial clones as control (Varghese et al, 2017). Four superior interspecific hybrid families were also used for comparison at three years from hybrid family trials (out of 16 control crossed families of commercial E. camaldulensis clones with E. urophylla/E.…”

Section: Methodsmentioning

confidence: 99%

“…pellita), tested along with the E. camaldulensis seedlots at two locations (Kamalakannan et al, 2011). Data analysis of E. camaldulensis progeny trials using Genstat 17 (VSN International, Hemel Hempstead, UK) is explained by Varghese et al (2017). Two phenotypic traits namely mean survival rate (%) and kraft pulp yield (KPY) reported (across three sites) in that study, were used to evaluate the impact of genetic diversity on variability of the traits.…”

Section: Methodsmentioning

confidence: 99%

“…Site had a major impact on phenotypic traits of E. camaldulensis with significant GxE effects for growth and survival across three low rainfall sites, depending on the length of dry season (number of dry months per year). Survival of clones and CSO 2 seedlot was higher (60 & 69 % respectively) in a site with 3-4 months' dry spell compared to other two sites (42-51 %) experiencing 5-7 dry months (Varghese et al, 2017). 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.…”

Section: Trade-off Between Genetic Diversity and Phenotypic Traitsmentioning

confidence: 99%

“…This involves a detailed analysis of the variation in genetic and phenotypic traits with genetic improvement. In a recent study, seed lots collected from second generation SPAs and clone trials (CSOs) were seen to be more productive than native provenance seed (NAT) in progeny trials evaluated at three sites in southern India (Varghese et al, 2017). The study also revealed that site effect on growth, kraft pulp yield (KPY) and wood density was greater than that of planting stock (between different sources -native provenance, SPA, CSO and clone).…”

Section: Introductionmentioning

confidence: 97%

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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

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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.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Trade-off Between Genetic Diversity and Phenotypic Traitsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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