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Query: "author" (Ines Štraus) .

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1.
Ectomycorrhiza between Scleroderma Areolatum Ehrenb. and Fagus sylvatica L.
Tanja Mrak, Katja Kühdorf, Tine Grebenc, Ines Štraus, Marko Bajc, Nada Žnidaršič, Babette Münzenberger, Hojka Kraigher, 2015, published scientific conference contribution abstract

Published in DiRROS: 03.11.2021; Views: 736; Downloads: 254
.pdf Full text (1,05 MB)

2.
Different belowground responses to elevated ozone and soil water deficit in three European oak species (Quercus ilex, Q. pubescens and Q. robur)
Tanja Mrak, Ines Štraus, Tine Grebenc, Jožica Gričar, Yasutomo Hoshika, Giulia Carriero, Elena Paoletti, Hojka Kraigher, 2019, original scientific article

Abstract: Effects on roots due to ozone and/or soil water deficit often occur through diminished belowground allocation of carbon. Responses of root biomass, morphology, anatomy and ectomycorrhizal communities were investigated in seedlings of three oak species: Quercus ilex L., Q. pubescens Willd. and Q. robur L., exposed to combined effects of elevated ozone (ambient air and 1.4 x ambient air) and water deficit (100% and 10% irrigation relative to field capacity) for one growing season at a free-air ozone exposure facility. Effects on root biomass were observed as general reduction in coarse root biomass by -26.8 % and in fine root biomass by -13.1 % due to water deficit. Effect on coarse root biomass was the most prominent in Q. robur (-36.3 %). Root morphological changes manifested as changes in proportions of fine root (<2 mm) diameter classes due to ozone and water deficit in Q. pubescens and due to water deficit in Q. robur. In addition, reduced fine root diameter (-8.49 %) in Q. robur was observed under water deficit. Changes in root anatomy were observed as increased vessel density (+18.5 %) due to ozone in all three species, as reduced vessel tangential diameter (-46.7 %) in Q. ilex due to interaction of ozone and water, and as generally increased bark to secondary xylem ratio (+47.0 %) due to interaction of ozone and water. Water deficit influenced occurrence of distinct growth ring boundaries in roots of Q. ilex and Q. robur. It shifted the ectomycorrhizal community towards dominance of stress-resistant species, with reduced relative abundance of Tomentella sp. 2 and increased relative abundances of Sphaerosporella brunnea and Thelephora sp. Our results provide evidence that expression of stress effects varies between root traits; therefore the combined analysis of root traits is necessary to obtain a complete picture of belowground responses.
Keywords: ozone, drought, fine roots, ectomycorrhiza, anatomy, morphology, plants
Published in DiRROS: 20.02.2020; Views: 1943; Downloads: 1279
.pdf Full text (1,03 MB)
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3.
Tipi ektomikorize pri sadikah bukve (Fagus sylvatica L.) v rizotronih
Ines Štraus, Marko Bajc, Tine Grebenc, Boštjan Mali, Hojka Kraigher, 2011, original scientific article

Abstract: Naravni procesi ali dejavnost človeka vplivajo na razmere v okolju, kar se zrcali v sestavi ektomikoriznih združb. V raziskavi smo želeli ugotavljati morebitne vplive več temperaturnih režimov zraka in tal (substrata) na pojavljanje in vrstno pestrost tipov ektomikorize na koreninskih vršičkih sadik bukve in v substratu. V ta namen smo analizirali pojavljanje tipov ektomikorize na sadikah bukve v rizotronih, izpostavljenih štirim temperaturnim razmeram v okolju: 1.) zrak 15-25 °C; 2.) zrak 15-25 °C v kombinaciji s hlajenim koreninskim sistemom za 5 °C; 3.) povišana temperatura zraka od 30-50 °C in 4.) zunanja (ambientalna) temperatura zraka v Ljubljani. Tipe ektomikorize smo identificirali s kombiniranim pristopom po anatomsko morfoloških znakih in z analizo molekularnih markerjev (ITS1-5.8S rDNK-ITS2 ribosomalna regija v rDNK). Na 51 koreninskih vršičkih 40 sadik smo identificirali 6 tipov ektomikorize. Pestrost ektomikoriznih tipov je bila največja pri razmerah blizu optimalnih za rast bukve. Po vrstni sestavi združbe ektomikoriznih gliv sta si najbolj podobna poskusa s temperaturo zraka15-25 °C z ali brez hlajenja koreninskega sistema. Najpogostejša ektomikorizna vrsta je bila Hebeloma sacchariolens, ki je bila tudi najpogosteje opažena vrsta na drobnih koreninah odmrlih sadik. Izbrane vrste ektomikoriznih gliv smo z metodo DGGE dokazali tudi v vseh analiziranih vzorcih substrata.
Keywords: sadike bukve, ektomikoriza, temperatura zraka, temperatura substrata, molekularni markerji, filogenija
Published in DiRROS: 12.07.2017; Views: 4763; Downloads: 1965
.pdf Full text (1,11 MB)

4.
Raziskave obrata izvenkoreninskega micelija v gozdnih tleh
Ines Štraus, Hojka Kraigher, 2014, published scientific conference contribution abstract

Keywords: ektomikoriza, vrastne mrežice, izotopske analize, minirizotroni
Published in DiRROS: 12.07.2017; Views: 2569; Downloads: 755
.pdf Full text (187,61 KB)

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