magistrsko delo
Tamara Sakovič (Avtor), Alenka Gaberščik (Mentor)

Povzetek

Raziskovali smo morfološke, biokemijske in optične lastnosti listov rušnate masnice z različnih rastišč ter preučevali, kako je vsebnost biomineralov v listih rušnate masnice odvisna od njihove vsebnosti v tleh ter kako biominerali vplivajo na različne funkcionalne značilnosti listov rušnate masnice. Meritve smo opravili na listih rušnate masnice s štirih različnih lokacij, ki smo jih nabrali v času cvetenja, ko so bili listi najbolj razviti. Nabrane vzorce listov smo prenesli v laboratorij, kjer smo izmerili odbojnost in presevnost listov, izvedli morfološke meritve na prečnih prerezih listov, s katerimi smo pridobili podatke o debelini listne ploskve, mezofila, kutikule in povrhnjice, o gostoti in dolžini bodičk ter listnih rež na zgornji in spodnji strani listov. Z biokemijskimi analizami smo določili vsebnost klorofilov, karotenoidov, antocianov in UV-absorbirajočih snovi v listih. Analizirali smo tudi vsebnost biomineralov v listih in vzorcih tal z lokacij vzorčenja rušnate masnice. Rezultati merjenja optičnih lastnosti listov rušnate masnice so pokazali, da imajo listi iz Rakovega Škocjana najvišjo odbojnost in hkrati najnižjo presevnost v UV-A- in UV-B-delu spektra. Podobno velja za vidni del spektra, kjer največ vpadne svetlobe absorbirajo klorofili. Rezultati meritev morfoloških in biokemijskih lastnosti so pokazali vpliv vsebnosti biomineralov na funkcionalne značilnosti listov rušnate masnice. Listi rastlin z višje nadmorske višine oz. z višjo vsebnostjo biomineralov Ca in Si v listih so bili debelejši, imeli so daljše bodičke, debelejšo povrhnjico in daljše listne reže. Presenetljivo je, da bi največjo gostoto bodičk, ki pršijo svetlobo, pričakovali pri listih izpod vrha Komna, ugotovili pa smo ravno obratno. Rezultati so pokazali, da vsebnost kalcija v vzorčenih tleh pozitivno korelira z vsebnostjo kalcija v listih rušnate masnice. Za silicij tega nismo potrdili.

Ključne besede

barvila;biominerali;Deschampsia caespitosa;morfološke lastnosti listov;optične lastnosti listov;trave;

Podatki

Jezik: Slovenski jezik
Leto izida:
Tipologija: 2.09 - Magistrsko delo
Organizacija: UL BF - Biotehniška fakulteta
Založnik: [T. Sakovič]
UDK: 57(043.2)
COBISS: 12797769 Povezava se bo odprla v novem oknu
Št. ogledov: 372
Št. prenosov: 70
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Angleški jezik
Sekundarni naslov: Optical properties of leaves of Deschampsia caespitosa from different locations
Sekundarni povzetek: We have researched the morphological, biochemical and optical properties of tufted hairgrass from different growing sites and we have studied how the content of biominerals in the tufted hairgrass leaves depends on their content in the ground and how biominerals affect the different functional characteristics of the tufted hairgrass leaves. We conducted measurements on the leaves of the tufted hairgrass that we collected in four different locations at the time of flowering when the leaves were most developed. We took the collected leaf samples to the laboratory where we measured the leaf reflectance and transmittance, performed morphological measurements on the leaf cross-sections, and in this way obtained data on the surface thickness of a leaf, on mesophyll, cuticle and epidermis, on density and spine length and leaf slits on the upper and lower side of the leaves. By conducting biochemical analyses we determined the content of chlorophylls, carotenoids, anthocyanins and UV-absorbing substances in the leaves. We also analysed the content of biominerals in leaves and soil samples from the sampling locations of the tufted hairgrass. The results of measuring the optical properties of the tufted hairgrass leaves showed that the leaves from Rakov Škocjan have both the highest reflectance and the lowest transmittance in the UV-A and UV-B part of the spectrum. This is similar in the visible part of the spectrum, where most of the incident light is absorbed by chlorophylls. The results of the measured morphological and biochemical properties showed the affect of biomineral content on the functional characteristics of the tufted hairgrass leaves. Plant leaves from higher altitudes or with a higher content of Ca and Si biominerals in leaves were thicker, had longer spines, thicker epidermis and longer leaf slits. It is surprising that the maximum density of spines that disperse light would be expected in the leaves collected below the top of Komen, however the exact opposite was established. The results showed that the calcium content in the sampled ground positively correlates with the calcium content in the tufted hairgrass leaves. We did not confirm this for silicon.
Sekundarne ključne besede: biology;chemistry;biologija;kemija;
Vrsta datoteke: application/pdf
Vrsta dela (COBISS): Magistrsko delo/naloga
Komentar na gradivo: Univ. v Ljubljani, Pedagoška fak., Poučevanje - Predmetno poučevanje, Biologija in kemija
Strani: VIII, 50 str.
ID: 11404400