doktorska disertacija
Mateja Grašič (Author), Alenka Gaberščik (Mentor)

Abstract

Silicij (Si) je za rastline zelo koristen element, saj pripomore k izboljšanju njihovega uspevanja v različnih stresnih razmerah, med drugim tudi v primeru vse pogostejšega pomanjkanja vode in povečanega UV sevanja. Naravno UV sevanje je ključno za normalen razvoj rastlin, hkrati pa lahko poveča tudi njihovo odpornost proti suši. Proučili smo vpliv razpoložljivosti vode na vsebnost Si in drugih elementov v listih žit s fotosintezo C3 in C4 (ječmen in navadno proso) ter učinek naravnega UV sevanja na privzem elementov in funkcionalne poteze listov ob pomanjkanju vode. Poleg tega nas je zanimal vpliv elementne sestave tal na vsebnost Si v listih (rušnata masnica) ter učinek različne vsebnosti Si v listih na funkcionalne poteze listov. Primerjali smo tudi vsebnost Si v listih med različnimi vrstami in razvojnimi fazami (ječmen in pira). Pri izbranih vrstah smo analizirali različne morfološke, biokemijske, optične in fiziološke lastnosti listov, spremljali nekatere okoljske dejavnike, proučili sestavo tal in izmerili vsebnost izbranih elementov v listih in tleh. Ječmen (C3) je bil bolj občutljiv na pomanjkanje vode kot navadno proso (C4), kar se je značilno odražalo na zmanjšani vsebnosti skoraj vseh proučevanih elementov v listih. Vpliv pomanjkanja vode je bil največji na vsebnost Si v listih. Naravno UV sevanje je ugodno vplivalo na nekatere funkcionalne poteze listov, a ni značilno omililo negativnega učinka pomanjkanja vode na privzem Si. Sestava tal je imela manjši učinek na vsebnost Si in drugih elementov v listih kot razpoložljivost vode. Vsebnost Si v listih je značilno vplivala na optične lastnosti listov ter vsebnost drugih elementov v listih in se je razlikovala tako med vrstami kot tudi med različnimi razvojnimi fazami.

Keywords

razpoložljivost vode;naravno UV sevanje;tla;silicij;ječmen;navadno proso;pira;rušnata masnica;morfološke lastnosti;biokemijske lastnosti;optične lastnosti;fiziološke lastnosti;listi;biomasa;vsebnost elementov;disertacije;

Data

Language: Slovenian
Year of publishing:
Typology: 2.08 - Doctoral Dissertation
Organization: UL BF - Biotechnical Faculty
Publisher: [M. Grašič]
UDC: 581.5:551.521.17:582.546(043.3)
COBISS: 37845507 Link will open in a new window
Views: 446
Downloads: 111
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Other data

Secondary language: English
Secondary title: ǂThe ǂimpact of water availability, UV radiation, and soil structure on silicon content and leaf functional traits of grasses
Secondary abstract: Silicon (Si) is a very beneficial element for plants, as it improves their growth under various stresses, including more frequent water shortage and increased UV radiation. Ambient UV radiation is crucial for normal plant development and may also increase plants' resistance to drought. We studied the effect of water availability on leaf contents of Si and other elements in C3 and C4 cereals (barley and proso millet), and the effect of ambient UV radiation on element uptake and leaf functional traits under water shortage. We were also interested in the impact of soil structure on leaf Si content (tufted hairgrass) and the effect of varying leaf Si content on leaf functional traits. In addition, we compared leaf Si content between species and developmental stages (barley and spelt). Different leaf morphological, biochemical, optical, and physiological properties were analysed, some environmental factors were monitored along, soil structure was studied, and contents of selected elements in leaves and soil were measured. Barley (C3) was more vulnerable to water shortage than proso millet (C4), which was significantly reflected in reduced leaf contents for most of the studied elements. Water shortage affected leaf Si content the most. Ambient UV radiation positively affected some of the leaf functional traits, but did not significantly mitigate the negative impact of water shortage on Si uptake. Soil structure was less important for leaf contents of Si and other elements than water availability. Leaf Si content significantly affected leaf optical properties and leaf contents of other elements, and differed between species as well as between different developmental stages.
Secondary keywords: water availability;ambient UV radiation;soil;silicon;barley;proso millet;spelt;tufted hairgrass;leaf;morphological properties;biochemical properties;optical properties;physiological properties;biomass;element contents;dissertations;
Type (COBISS): Doctoral dissertation
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Biotehniška fak.
Pages: X f., 139, [6] str.
ID: 12067902