Makroskopske in mikroskopske razlike med zavrtim poganjkom in sledjo iglic v lesu nekaterih iglavcev : diplomsko delo

Može, Robert (avtor), Oven, Primož (mentor), Čufar, Katarina (recenzent)

Pri jelki (Abies alba Mill.), navadni smreki (Picea abies (L.) Karst.) in rdečem boru (Pinus sylvestris L.) smo proučevali makroskopsko in mikroskopsko zgradbo zavrtih poganjkov in sledi iglic. Izbrali smo po 2 drevesi jelke, navadne smreke in rdečega bora. Izmerili smo premer dreves, višino dreves, in višino na kateri so se pojavili prvi zavrti poganjki in sledi iglic. Drevesa smo razžagali na kolute in nato izrezali vzorčke za izdelavo preparatov. Pripravili smo tkivne rezine preiskovanih tkiv v vseh 3 ksilotomskih ravninah in jih obarvali z barviloma safranin in astro modro. Slike smo izdelali s pomočjo svetlobnega mikroskopa Nikon Eclipse E800 in računalnika. Ugotovili smo, da pri jelki in navadni smreki obstajajo makroskopske in mikroskopske razlike med zavrtimi poganjki in sledmi iglic, pri rdečem boru pa teh razlik ni. Sledi iglic in zavrti poganjki pri navadni smreki in jelki ter kratki poganjki pri rdečem boru potekajo pravokotno na letnice. Pri jelki in navadni smreki je mogoče sled iglic in zavrtih poganjkov najenostavneje razlikovati na osnovi anatomskih posebnosti v skorji; na konceh zavrtih poganjkov se nahajajo celice, ki imajo meristemski karakter, pri sledeh iglic pa teh tkiv ni. Pri jelki in navadni smreki sestavljajo sled zavrtih poganjkov radialno usmerjene traheide z debelimi stenami, ki imajo helikalne odebelitve. Ta vaskularni pramen obdajajo celice, ki imajo nelignificirano lesno tkivo.

• Jezik: Slovenski jezik
• Ključne besede: zavrti poganjki, sledi iglic, anatomija lesa, jelka, Abies alba, navadna smreka, Picea abies, rdeči bor, Pinus sylvestris
• Vrsta gradiva: Diplomsko delo
• Tipologija: 2.11 - Diplomsko delo
• Organizacija: BF - Biotehniška fakulteta
• Kraj izida: Ljubljana
• Založnik: [R. Može]
• Leto izida: 2007
• Št. strani: IX, 41 f.
• PID: 20.500.12556/RUL-244
• UDK: 630*81
• COBISS.SI-ID: 1565833
• Datum objave v RUL: 11.07.2014

MOŽE, Robert, 2007, Makroskopske in mikroskopske razlike med zavrtim poganjkom in sledjo iglic v lesu nekaterih iglavcev : diplomsko delo [na spletu]. Diplomsko delo. Ljubljana : R. Može. [Dostopano 24 april 2025]. Pridobljeno s: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=slv&id=244

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Macroscopic and microscopic differences between suppressed buds and needle traces in wood of some conifers : visokošolski strokovni študij

Izvleček

Structure of suppressed buds and needle traces was investigated in silver fir (Abies alba Mill.), Norway spruce (Picea abies (L.) Karst.) and scots pine (Pinus sylvestris L.) macroscopically and microscopically. 2 trees per species were selected. We measured diameter and height of trees, and height where first suppressed buds and needle traces occurred. Trees were sawen into discs and thereafter samples for preparations dissected. Tissue sections were prepared in all 3 xylotomical planes and thereafter stained with safranin and astra blue. Images were made by the aid of Nikon Eclipse E800 microscope and computer. We found that there exist macroscopic and microscopic differences instructure of suppressed buds and needle traces in silver fir and Norway spruce, whereas differences were absent in Scots pine. Suppressed buds and needle traces in silver fir and Norway spruce and short buds in Scots pine run perpendicular to orientation of growth ring boundaries. The easiest way to distinguish needle traces and suppressed buds in silver fir and Norway spruce is their anatomy. When present in the bark, at the top of suppressed buds are present cells with meristematic character, whereas this tissue is not present in needle traces. Trace of suppressed buds is composed of radially oriented tracheids with thick walls with helical thickenings. This vascular bundle is surrounded by unlignified cells.

• Ključne besede: suppresed buds, needle traces, anatomy of wood, silver fir, Norway spruce, Scots pine