Optične lastnosti listov rožmarinolistne vrbe

diplomsko delo

Urša Malovrh (Author), Alenka Gaberščik (Mentor)

Abstract

Preučevala sem vpliv anatomije in biokemijskih lastnosti listov na njihove optične lastnosti pri vrsti Salix rosmarinifolia L. Ugotovila sem, da se povečana reflektanca listov kaže na spodnji povrhnjici, kar je posledica različne zgradbe lista in vsebnosti pigmentov. Pri anatomiji lista sem ugotovila, da je delež stebričastega tkiva večji, gobastega pa manjši. Gobasto tkivo je pomembnejše pri prehajanju svetlobe skozi liste, saj omogoča boljši odboj svetlobe. Zaradi bližine gobastega tkiva spodnji povrhnjici v primerjavi s stebričastim tkivom je zato odboj svetlobe spodnje povrhnjice večji. Pokazalo se je, da na optične lastnosti vpliva tudi gostota trihomov. Na spodnji povrhnjici je zaradi večje gostote trihomov zmanjšan odboj svetlobe. Vloga trihomov pa ni le v odboju svetlobe, temveč so ključnega pomena tudi pri zadrževanju toplote (NIR – infrardeče sevanje). Listnih rež zaradi prevelikih odstopanj meritev nisem vključila v raziskavo. Klorofil a kot ključen fotosintezni pigment velja za najpomembnejšega med klorofili, vloga preostalih pigmentov (klorofil b, karotenoidi, antociani in UV-absorbirajoče snovi) pa je predvsem zaščita listnega tkiva pred vplivi okolja.

Keywords

vrbe;optične lastnosti;Salix rosmarinifolia L;

Data

Language:	Slovenian
Year of publishing:	2016
Typology:	2.11 - Undergraduate Thesis
Organization:	UL PEF - Faculty of Education
Publisher:	[U. Malovrh]
UDC:	582.681.83(043.2)
COBISS:	11210825
Views:	617
Downloads:	132
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Optical properties of Salix rosmarinifolia L. leaves
Secondary abstract:	I was studying the influence of anatomy and biochemical properties of leaves on their optical properties in the Salix rosmarinifolia species. I found out that increased reflectance is apparent on the abaxial (lower) epidermis, which is caused by different leaf structure and pigment content. Concerning the leaf anatomy, I found out that palisade mesophyll share is larger than that of spongy mesophyll. However, spongy mesophyll enables better light reflection and is thus more important as far as light passing through leaves is concerned. Due to the spongy mesophyll's proximity to the abaxial epidermis as compared to the palisade mesophyll, abaxial epidermis reflects more light. It was indicated that trichome density also influences optical properties. Due to considerable trichome density, light reflection is reduced on the abaxial epidermis. However, trichomes' role is not only light reflection, as they are also of key importance for warmth preservation (NIR – infrared radiation). I did not include stomata in my research, since measurement deviations were too high. As a key photosynthesis pigment, chlorophyll a is considered to be the most important of all chlorophyll structures, whereas other pigment roles (chlorophlyll b, carotenoids, anthocyanins and UV-absorbing substances) are primarily in protecting leaf tissue from environmental risks.
Secondary keywords:	botany;botanika;
File type:	application/pdf
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Ljubljani, Pedagoška fak., Biotehniška fak., Biologija-kemija
Pages:	VIII, 28 str.
ID:	9175179