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3. Tehnične smernice za ohranjanje in rabo genskih virov : lesnika ali divja jablana in drobnica ali divja hruška = Malus sylvestris / Pyrus pyrasterB. Richard Stephan, Iris Wagner, Jochen Kleinschmit, 2012, professional article Keywords: genski viri, drevesne vrste, tehnične smernice, lesnika, divja jablana, Malus sylvestris, drobnica, divja hruška, Pyrus pyraster
Published in DiRROS: 20.12.2023; Views: 673; Downloads: 192
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5. Tehnične smernice za ohranjanje in rabo genskih virov : trepetlika = Populus tremulaGeorg von Wühlisch, 2012, professional article Abstract: Tehnične smernice so namenjene vsem, ki cenijo dragocen genski sklad trepetlike in njegovo varovanje z ohranjanjem semenskih virov in rabo v gozdarski praksi. Namen smernic je ohranitev genetske raznolikosti vrste v evropskem merilu. Priporočila v sestavku so temelj, ki ga je treba dopolniti in še naprej razvijati ob upoštevanju lokalnih, nacionalnih ali regionalnih razmer. Navodila temeljijo na razpoložljivem znanju o vrstah in splošno sprejetih metodah za ohranjanje gozdnih genskih virov. Slovenski dodatek prikazuje naravno razširjenost trepetlike in belega topola v Sloveniji, v njem so opisana njuna značilna rastišča in ekološke razmere, ki so ustrezne za njuno uspevanje, ter rastlinske združbe, v katerih se pojavljata. Posebej je omenjen pomen različnih oblik mikorize, ki trepetliki in belemu topolu omogočajo preživeti tudi na degradiranih rastiščih.
Keywords: genski viri, drevesne vrste, tehnične smernice, trepetlika, Populus tremula, Populus alba, beli topol
Published in DiRROS: 20.12.2023; Views: 622; Downloads: 170
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10. Low but significant evolutionary potential for growth, phenology and reproduction traits in European beechMarjana Westergren, Juliette Archambeau, Marko Bajc, Rok Damjanić, Adélaïde Theraroz, Hojka Kraigher, Sylvie Oddou-Muratorio, Santiago C. González-Martínez, 2023, original scientific article Abstract: Local survival of forest tree populations under climate change depends on existing genetic variation and their adaptability to changing environments. Responses to selection were studied in European beech (Fagus sylvatica) under field conditions. A total of 1087 adult trees, seeds, 1-year-old seedlings and established multiyear saplings were genotyped with 16 nuSSRs. Adult trees were assessed for phenotypic traits related to growth, phenology and reproduction. Parentage and paternity analyses were used to estimate effective female and male fecundity as a proxy of fitness and showed that few parents contributed to successful regeneration. Selection gradients were estimated from the relationship between traits and fecundity, while heritability and evolvability were estimated using mixed models and the breeder's equation. Larger trees bearing more fruit and early male flowering had higher total fecundity, while trees with longer growth season had lower total fecundity (directional selection). Stabilizing selection on spring phenology was found for female fecundity, highlighting the role of late frosts as a selection driver. Selection gradients for other traits varied between measurement years and the offspring cohort used to estimate parental fecundity. Compared to other studies in natural populations, we found low to moderate heritability and evolvability for most traits. Response to selection was higher for growth than for budburst, leaf senescence or reproduction traits, reflecting more consistent selection gradients across years and sex functions, and higher phenotypic variability in the population. Our study provides empirical evidence suggesting that populations of long-lived organisms such as forest trees can adapt locally, even at short-time scales.
Keywords: climate change, Fagus sylvatica, heritability, in situ adaptation, response to selection, selection gradients
Published in DiRROS: 12.12.2023; Views: 720; Downloads: 320
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