diplomsko delo
Katja Prek Ljubetič (Author), Mateja Germ (Reviewer), Alenka Gaberščik (Mentor), Alenka Gaberščik (Thesis defence commission member), Tadeja Trošt Sedej (Thesis defence commission member), Mateja Germ (Thesis defence commission member)

Abstract

Raziskovali smo, kako se spreminja vsebnost silicijevih (Si) fitolitov pri trstični pisanki (Phalaris arundinacea) med rastno sezono ter kakšen vpliv ima količina Si fitolitov na optične lastnosti. Rastline smo nabirali ob Cerkniškem jezeru v rastni sezoni leta 2012. V laboratoriju smo opravili biokemijske, morfološke in anatomske analize. Izmerili smo tudi vsebnost fitolitov in opravili meritve odbojnih in presevnih spektrov. Odbojni in presevni spektri listov so si bili med seboj podobni, prav tako so bile podobne morfološke lastnosti. Pri biokemijskih lastnostih izstopa večja količina UV-absorbirajočih snovi pri listih prvega vzorčenja in večja količina klorofila a pri listih zadnjega vzorčenja. Iz dendrograma podobnosti med vzorci opazimo, da so si najbolj podobni mladi listi vseh vzorčenj, izstopajo pa stari listi. Količina fitolitov med rastno sezono ni naraščala, najnižjo količino smo izmerili pri listih iz drugega vzorčenja. Vpliva fitolitov na optične lastnosti nismo zaznali. Opazili smo smiselno nasprotno korelacijo med količino fitolitov in količino antocianov. Redundančna analiza je pokazala, da na optične lastnosti najbolj vpliva količina klorofila a, ki je nasprotno povezana z intenziteto rumene in zelene svetlobe.

Keywords

fitoliti;spektralne lastnosti;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL BF - Biotechnical Faculty
Publisher: [K. Prek Ljubetič]
UDC: 582(043.2)
COBISS: 11290185 Link will open in a new window
Views: 685
Downloads: 128
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Other data

Secondary language: English
Secondary title: Optical properties of leaves in Phalaris arudinacea
Secondary abstract: We studied how the content of silica (Si) phytoliths varies during the growing season in the leaves of Phalaris arudinacea and what impact the amount of silicon has on optical properties. The plants were sampled at Lake Cerknica during the growing season of 2012. In the laboratory, we conducted biochemical, morphological and anatomical analysis. We also measured the content phytoliths as well as reflectance and transmission spectra of the leaves. Optical spectra of the leaves are similar, as are the morphological features. There is an increased amount of UV-absorbing compounds in the leaves of the first sampling and a greater amount of chlorophyll a in the leaves of last sampling. From the dendrogram of similarity it can be observed that young leaves from all samplings are most similar and old leaves of the first sampling most different. Silicon content did not increase, the minimum Si quantity was measured in the leaves in the second sampling. We did not detect the effect on silicon on optical properties. We noticed that the quantity of silicon and the amount of anthocyanins is anti-correlated. Redundancy analysis has shown that the optical properties are most affected by chlorophyll a, which is which is inversely correlated with the intensity of yellow and green light.
Secondary keywords: botany;botanika;
File type: application/pdf
Type (COBISS): Undergraduate thesis
Thesis comment: Univ. v Ljubljani, Pedagoška fak., Biotehniška fak., Fak. za kemijo in kemijsko tehnologijo, Naravoslovnotehniška fak., Kemija in biologija
Pages: X f., 52 str., [13] f. pril.
ID: 9221910