Vpliv ultravijoličnega sevanja in suše na prisotnost biominerolov v listih navadnega ječmena (Hordeum vulgare L.)

Dobravc, Maja (author), Gaberščik, Alenka (mentor)

V magistrskem delu smo proučevali vpliv naravnega UV sevanja in razpoložljivosti vode na vsebnost biomineralov v listih navadnega ječmena (Hordeum vulgare L.). V korita smo posejali navadni ječmen in jih postavili na zunanjo testno površino. Polovica korit je bila postavljena pod strešnike, ki prepuščajo celoten svetlobni spekter, polovica pa je bila pod strešniki, ki prepuščajo vidni del svetlobnega spektra in le okoli 10 % UV sevanja. V vsaki skupini smo imeli tudi dva tipa razpoložljivosti vode; normalno zalivanje in sušo. Za vsa štiri obravnavanja rastlin smo izmerili vsebnost silicija in kalcija v listih, odbojnost in presevnost listov, vsebnost ter debelino tkiv in struktur na povrhnjici listov. Spremljali smo tudi fiziološko stanje rastlin, vsebnost barvil in razmere v okolju. Rezultati naše raziskave so pokazali, da je imela razpoložljivost vode vpliv na vsebnost biomineralov kalcija in silicija v listih. UV sevanje ni imelo statistično značilnega vpliva na vsebnost teh dveh elementov v listih. Rezultati meritev potencialne in dejanske fotokemične učinkovitosti so pokazali, da neugodna razpoložljivost vode in raven naravnega UV sevanja nista imela negativnega vpliva na vitalnost rastlin. Rezultati morfoloških meritev pa so pokazali največja odstopanja pri specifični listni površini, na kar je vplivala razpoložljivost vode. Ugotovili smo, da na vsebnost klorofila a in b, karotenoidov in antocianov v listih ni vplivala ne razpoložljivost vode ne naravno UV sevanje. Presevnost in odbojnost listov sta bili največji v vidnem delu spektra.

• Language: Slovenian
• Keywords: ječmen
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: PEF - Faculty of Education
• Year: 2019
• PID: 20.500.12556/RUL-108017
• COBISS.SI-ID: 12460361
• Publication date in RUL: 17.06.2019

Secondary language

• Language: English
• Title: Impact of ultraviolet radiation and drought on the content of biominerals uptake in leaves of barley

Abstract

In the master's thesis we studied the effect of natural UV radiation and water availability on the biomineral content in barley leaves (Hordeum vulgare L.). We sowed barley in troughs and placed them on an outdoor testing area. Half of the troughs were positioned under roof tiles that let through the entire light spectrum, while the other half were positioned under roof tiles that let through the visible part of the light spectrum and only about 10% of UV radiation. Each group also had two types of water availability; normal watering and drought. For all four treatments of plants, we measured the silicon and calcium content in the leaves, the reflectivity and transmittance of the leaves, as well as content, tissue thickness and structures on the surface of the leaves. We also monitored the physiological state of the plants, pigment content and conditions in the surrounding environment. The results of our studies showed that water availability affected the biomineral content of calcium and silicon in the leaves. UV radiation did not have a statistically significant effect on the content of these two elements in the leaves. The results of potential and actual photochemical effectiveness tests showed that unfavourable water availability and the level of natural UV radiation did not have a negative effect on the plants’ vitality. The results of morphological tests showed the greatest deviations in specific leaf surfaces, which were affected by water availability. We found that neither water availability nor natural UV radiation had an effect on the content of chlorophyll a and b, carotenoids and anthocyanins in the leaves. The transmittance and reflectivity of the leaves were greatest in the visible part of the spectrum.

• Keywords: barley