National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
Tvorba terpenoidů u buku lesního v podmínkách zvýšené koncentrace CO2 a UV záření.
Pernicová, Natálie
Plants release a wide spectrum of biogenic volatile organic compounds into the envi-ronment. These compounds attract pollinators and can protect plants against pests and/or biotic and abiotic stresses. I have investigated the impact of different UV radiation in-tensities and elevated atmospheric CO2 concentrations on the content of terpenoids in the leaves of European beech during the vegetation season. The trees were growing un-der the elevated (EC; 700 ppm) and ambient CO2 concentration (AC; 400 ppm) and at three UV radiation intensities - ambient (UVamb), enhanced (150 %; UV+), and excluded (UV–). The results show that AC trees had higher content of monoterpenes than EC trees during the whole vegetation season. Limonene and 2-bornene were found to be the most abundant monoterpenes located in the beech leaves. The highest content of 2-bornene was found in AC plants cultivated under UV– radiation. The contents of α-pinene gradually decreased during the vegetation season, while the content of limonene was increasing.Formula clause:
How plants cope to stress: Odour (didactic work - basic school level)
NEJEDLÁ, Veronika
The purpose of this diploma work is preparation attractive working sheets, which approximate to the pupils of the primary school amusing form one actual ecological problem in the empire of the herbage. Working sheets are divided into four parts. Every part contains at first the theoretic pieces of knowledge and then their exercises. The theory includes the topic of vegetable essential oils and their tasks in vegetable stress. This subject is processed from the view to knowledge of the pupils from primary scholls. Contribution of working sheets is experimentally checked-out practically. By two sets of pupils is given test to check the level knowledge {--} by those, who working sheets worked up and to the control group of the pupils, who didn´t work with working sheets. Test results are compared.

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