Reduction of pollen contamination in Scots pine seed orchard crop by tent isolation

Torimaru, Takeshi; Wennström, Ulfstand; Andersson, B.; Almqvist, Curt; Wang, Xiaoru

doi:10.1080/02827581.2013.838298

Cited by 16 publications

(13 citation statements)

References 20 publications

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“…This suggests that, if background pollen is present around the seed orchard, it can either penetrate long distances without being effectively filtered out by the canopy or, more likely, that it enters the orchard vertically from above the canopy. In Torimaru et al (2013), a slightly higher pollen contamination was found in the inner blocks than in outer ones (25.6% vs. 17.4%), but the difference was not significant.…”

Section: Pollen Contaminationcontrasting

confidence: 46%

“…At the time of data collection for this study, it consisted of 3740 live ramets, with 133.6 ± 88.4 SD ramets per parent, and an additional 67 trees that were visually identified as overgrowing rootstocks. Another 71 ramets representing 10 different parents were, at the time of pollination, isolated from the ambient seed orchard environment by large plastic tents as described in Torimaru et al (2013). The orchard is bordered by a 35-100 m wide belt of broadleaves in the south-west, which further connects to an approximately 1.5 km wide lake.…”

Section: Seed Orchardmentioning

confidence: 99%

“…In Scandinavia, pollen contamination is expected to be particularly high in seed orchards of the most economically important tree species, Scots pine and Norway spruce, due to the difficulty to find sites sufficiently distant from external, conspecific stands (Lindgren et al 1995). Isolation tents have been proposed to limit pollen contamination, and a recent, small-scale experiment found no pollen contamination in isolation tents versus over 22% in the openpollinated controls (Torimaru et al 2013).…”

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Low rates of pollen contamination in a Scots pine seed orchard in Sweden: the exception or the norm?

Funda

Wennström

Almqvist

et al. 2015

Scandinavian Journal of Forest Research

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We investigated mating structure and gene flow in a clonal seed orchard of Scots pine (Pinus sylvestris L.) over three consecutive pollination seasons (2010-2012) with nine nuclear microsatellite markers. The paternity of 1991 offspring from four maternal parents was assigned to 28 candidate fathers using an exclusion procedure and a likelihood-based method implemented in the program CERVUS. Relative reproductive success was highly variable among pollen parents but consistent across years and ranged from 0.1% to 18.3%. Consequently, the seed crops' effective number of fathers was reduced to 52.9%, 48.8%, and 45.7% of the census in the three seasons, respectively. Self-fertilization fluctuated around the orchard's expected value of 5.1%, reaching 4.05%, 7.71%, and 6.61%, respectively. Pollen contamination was estimated to be 5.64%, 7.29%, and 4.89%, respectively, after correction for cryptic gene flow. CERVUS provided similar results as the exclusion method, but estimates greatly varied depending on the input parameters, mainly the proportion of fathers sampled. These results indicate the studied seed orchard is a well-functioning production population with only minor negative effects of self-fertilization and pollen contamination on the quality of seed crops. Genotyping issues associated with microsatellites as a potential source of false paternity assignment and exclusion are discussed.

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Section: Pollen Contaminationcontrasting

confidence: 46%

Section: Seed Orchardmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Low rates of pollen contamination in a Scots pine seed orchard in Sweden: the exception or the norm?

Funda

Wennström

Almqvist

et al. 2015

Scandinavian Journal of Forest Research

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“…This would also offset due to pollen contamination from outside the seed orchard (El-Kassaby & Aakew 1991). Pollen contamination causes losses of genetic gain but enhances GD (El-Kassaby et al 1989;Torimaru et al 2009;Torimaru et al 2013). Loss of GD is inversely proportional to the group coancestry (Lindgren et al 1996) and the effective number (Kang & Lindgren 1998;Ertekin 2010).…”

Section: Discussionmentioning

confidence: 97%

Estimation of genetic gain and diversity under various genetic thinning scenarios in a breeding seed orchard ofQuercus acutissima

Lee

Han

et al. 2015

Scandinavian Journal of Forest Research

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Genetic gain and diversity were estimated based on three simulated thinning scenarios at various thinning intensities in a breeding seed orchard of Quercus acutissima. The seed orchard was composed of 32 families with 744 individual trees with volume at age 15. The three thinning scenarios were individual thinning (IT) which thinning was based on the individual performance, family thinning (FT) with the removal of inferior families regardless of individual performance, and family + within family thinning (FWF) with family first and then individual from inferior families. The genetic gain was estimated based on stem volume. Expected genetic gain (volume at age 15) under IT was higher than FT and FWF at all thinning intensities. The FWF provided higher genetic gain than FT but lower than IT. The FT gave the lowest genetic gain compared to the other thinning scenarios at all thinning intensities. The loss of gene diversity (GD), estimated by coancestry and family size, was higher under FWF and lower under FT at moderate thinning intensities. The study showed that genetic gain estimation and GD loss were inversely coupled. The IT gave highest genetic gain but lowest GD at the highest thinning intensity.

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“…The primary function of tents in our study was to reduce pollen contamination by creating a physical barrier between the protected trees and the outside environment ) and simultaneously shifting the trees' reproductive phenology from that of unprotected trees. Our preliminary investigation from one pollination season showed that pollen contamination within the tents was completely eliminated (Torimaru et al 2013) but whether this was a representative result required validation from multiple seasons.…”

Section: Communicated By Y Tsumuramentioning

confidence: 99%

Mating dynamics of Scots pine in isolation tents

Funda

Wennström

Almqvist

et al. 2016

Tree Genetics & Genomes

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Seed orchards are forest tree production populations for supplying the forest industry with consistent and abundant seed crops of superior genetic quality. However, genetic quality can be severely affected by non-random mating among parents and the occurrence of background pollination. This study analyzed mating structure and background pollination in six large isolation tents established in a clonal Scots pine seed orchard in northern Sweden. The isolation tents were intended to form a physical barrier against background pollen and induce earlier flowering relative to the surrounding trees. We scored flowering phenology inside and outside the tents and tracked airborne pollen density inside and outside the seed orchard in three consecutive pollination seasons. We genotyped 5683 offspring collected from the tents and open controls using nine microsatellite loci, and assigned paternity using simple exclusion method. We found that tent trees shed pollen and exhibited maximum female receptivity approximately 1 week earlier than trees in open control. The majority of matings in tents (78.3 %) occurred at distances within two trees apart (about 5 m). Selffertilization was relatively high (average 21.8 %) in tents without supplemental pollination (SP), but it was substantially reduced in tents with SP (average 7.7 %). Pollen contamination was low in open controls (4.8-7.1 %), and all tents remained entirely free of foreign pollen. Our study demonstrates that tent isolation is effective in blocking pollen immigration and in manipulating flowering phenology. When complimented with supplemental pollination, it could become a useful seed orchard management practice to optimize the gain and diversity of seed orchard crops.

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Reduction of pollen contamination in Scots pine seed orchard crop by tent isolation

Cited by 16 publications

References 20 publications

Low rates of pollen contamination in a Scots pine seed orchard in Sweden: the exception or the norm?

Low rates of pollen contamination in a Scots pine seed orchard in Sweden: the exception or the norm?

Estimation of genetic gain and diversity under various genetic thinning scenarios in a breeding seed orchard ofQuercus acutissima

Mating dynamics of Scots pine in isolation tents

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