The higher availability of nutrients increases the production but decreases the quality of pollen grains in Juniperus communis L.

Pers‐Kamczyc, Emilia; Tyrała-Wierucka, Żanna; Rabska, Mariola; Wrońska‐Pilarek, Dorota; Kamczyc, Jacek

doi:10.1016/j.jplph.2020.153156

Cited by 24 publications

(29 citation statements)

References 65 publications

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“…through EU LIFE projects, Habitat Directive 92/43/EEC 1992). This pioneer species is tolerant to poor soils, drought and low temperatures, and is intolerant to shade, high temperatures, nitrogen deposition and competition from other species (Thomas et al 2007; Ward 2007; Vanden Broeck et al 2011; Pers‐Kamczyc et al 2020).…”

Section: Methodsmentioning

confidence: 99%

Using genetic evaluation to guide conservation of remnant Juniperus communis (Cupressaceae) populations

Jacquemart

Buyens

Delescaille³

et al. 2020

Plant Biol J

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• Many critically endangered plant species exist in small, genetically depauperate or inbred populations, making assisted gene flow interventions necessary for long-term population viability. However, before such interventions are implemented, conservation practitioners must consider the genetic and demographic status of extant populations, which are strongly affected by species' life-history traits. In northwestern Europe, Juniperus communis, a dioecious, wind-pollinated and bird-dispersed gymnosperm, has been declining for the past century and largely exists in small, isolated and senescent populations. • To provide useful recommendations for a recovery plan involving translocation of plants, we investigated genetic diversity and structure of populations in Belgium using four microsatellite and five plastid single-nucleotide polymorphism (SNP) markers. • We detected no clonality in the populations, suggesting predominantly sexual reproduction. Populations exhibited high genetic diversity (H e = 0.367-0.563) and low to moderate genetic differentiation (F ST ≤ 0.133), with no clear geographic structure. Highly positive inbreeding coefficients (F IS = 0.221-0.507) were explained by null alleles, population substructuring and biparental inbreeding. No isolation by distance was observed among distant populations, but isolation at close geographic proximity was found. Patterns were consistent with high historical gene flow through pollen and seed dispersal at both short and long distances. We also tested four pre-germination treatments among populations to improve germination rates; however, germination rates remained low and only cold-stratification treatments induced germination in some populations. • To bolster population regeneration, introductions of cuttings from several source populations are recommended, in combination with in situ management practices that improve seedling survival and with ex situ propagation.

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Section: Methodsmentioning

confidence: 99%

Using genetic evaluation to guide conservation of remnant Juniperus communis (Cupressaceae) populations

Jacquemart

Buyens

Delescaille³

et al. 2020

Plant Biol J

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“…The ascertained germination of freshly harvested juniper pollen ranged between 67.3 and 88.6%, which was lower than that of fresh pollen in Pinus sylvestris , P. mugo, and their hybrids (88.2–95.4%) 24 . In a study on the effect of nitrogen fertilisation on the quality of J. communis pollen, a relatively low germination rate in pollen collected from fertilised plants (1.36%) was reported compared with non-fertilised plants (24.9%) 25 . The low pollen quality was considered one of the factors responsible for reproductive failure in natural populations of common juniper.…”

Section: Discussionmentioning

confidence: 99%

“…In our study, the entire process was completed within 60–90 min, during which an overwhelming majority of the pollen grains formed their hydrophilic capsules. The process was originally reported to take place in both viable and dead pollen grains, but recent data indicated that only 75% of incubated pollen grains released their exines after 96 h of incubation 25 . This is an additional reason for the continuation of pollen germination experiments aimed at elucidating aspects of the pollen germination mechanism in common juniper.…”

Section: Discussionmentioning

confidence: 99%

Longevity and germination of Juniperus communis L. pollen after storage

Boleček

Galgóci

Gömöry

2021

Sci Rep

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Pollen storage belongs among the most important activities associated with pollen handling. It overcomes the differences in pollen shedding and ovule receptivity during controlled pollination experiments. It is especially important for species like common juniper (Juniperus communis L.) with an extremely low quality of seeds due to pollination failure. Additionally, it is a substantial part of germplasm preservation programmes in pollen banks. In the present paper, the effect of short-term storage of pollen was studied using pollen samples from five shrubs in an in vitro germination test. Two temperature regimes were tested. The pollen viability of freshly collected pollen varied considerably between individual shrubs, exhibiting 67.3–88.6% germination rate and 248.0–367.3 µm of pollen tubes. Storage at + 4 °C for four months was accompanied by a profound decline in pollen viability. The germination percentage was reduced to 49.2–75.2% and the pollen tube length to 32.5–69.0%, depending on individual shrubs. The corresponding decline in pollen viability characteristics during storage at − 20 °C was only negligible in two of the tested shrubs. In the remaining three shrub samples, an increase in germination percentage was observed. Pollen tube growth responded more sensitively to freezing, but, on average, the decrease in length was lower than that at + 4 °C. The rate of reduction in pollen tube length varied between 11.5 and 45.4%. Cytological events accompanying in vitro germination of freezer-stored pollen exhibited some delay in releasing the exine from pollen grains during the early stages of germination as compared with freshly collected pollen. In conclusion, short-term storage of the common juniper pollen in a freezer is better for the preservation of its viability than storage at + 4 °C.

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“…More individual results were published in the following years (e.g. Pidek, 2007;Giesecke and Fontana, 2008;Gerasimidis et al, 2006;Jensen et al, 2007;Hättestrand et al, 2008), and comparative studies followed in a second special volume published in 2010 (Giesecke et al, 2010). The data produced by contributors to the PMP were analysed for different questions, including weather parameters determining the amount of pollen production (van der and its correlation to masting years in Fagus (Pidek et al, 2010).…”

Section: The Pollen Monitoring Programme (Pmp)mentioning

confidence: 99%

Patterns in recent and Holocene pollen accumulation rates across Europe – the Pollen Monitoring Programme Database as a tool for vegetation reconstruction

Abrahám

Hicks²,

Svobodová-Svitavská

et al. 2021

Biogeosciences

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Abstract. The collection of modern, spatially extensive pollen data is important for the interpretation of fossil pollen assemblages and the reconstruction of past vegetation communities in space and time. Modern datasets are readily available for percentage data but lacking for pollen accumulation rates (PARs). Filling this gap has been the motivation of the pollen monitoring network, whose contributors monitored pollen deposition in modified Tauber traps for several years or decades across Europe. Here we present this monitoring dataset consisting of 351 trap locations with a total of 2742 annual samples covering the period from 1981 to 2017. This dataset shows that total PAR is influenced by forest cover and climate parameters, which determine pollen productivity and correlate with latitude. Treeless vegetation produced PAR values of at least 140 grains cm−2 yr−1. Tree PAR increased by at least 400 grains cm−2 yr−1 with each 10 % increase in forest cover. Pollen traps situated beyond 200 km of the distribution of a given tree species still collect occasional pollen grains of that species. The threshold of this long-distance transport differs for individual species and is generally below 60 grains cm−2 yr−1. Comparisons between modern and fossil PAR from the same regions show similar values. For temperate taxa, modern analogues for fossil PARs are generally found downslope or southward of the fossil sites. While we do not find modern situations comparable to fossil PAR values of some taxa (e.g. Corylus), CO2 fertilization and land use may cause high modern PARs that are not documented in the fossil record. The modern data are now publicly available in the Neotoma Paleoecology Database and aid interpretations of fossil PAR data.

show abstract

The higher availability of nutrients increases the production but decreases the quality of pollen grains in Juniperus communis L.

Cited by 24 publications

References 65 publications

Using genetic evaluation to guide conservation of remnant Juniperus communis (Cupressaceae) populations

Using genetic evaluation to guide conservation of remnant Juniperus communis (Cupressaceae) populations

Longevity and germination of Juniperus communis L. pollen after storage

Patterns in recent and Holocene pollen accumulation rates across Europe – the Pollen Monitoring Programme Database as a tool for vegetation reconstruction

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