Nastanek ranitvenih tkiv pri ostrolistnem javorju (Acer platanoides L.) po površinskem poškodovanju debla : diplomsko delo - univerzitetni študij

Bajuk, Eva (avtor), Oven, Primož (mentor), Marion, Lena (komentor)

Pri ostrolistnem javorju (Acer platanoides L.), kjer je bila z lesnega cilindra odstranjena skorja ali celo kambijeva cona, se je opazovalo nastanek ranitvenih tkiv. Proučevano je bilo zaporedje histoloških sprememb ter vpliv sezone poškodovanja in vitalnosti dreves na proces preraščanja poškodb. V trehobdobjih rastne sezone 2005 sta bili vsakič poškodovani po dve zdravi in po dve prizadeti drevesi. Na vsakem drevesu je bilo narejenih 8-9 poškodb. Vsake 3-4 dni, vsaj šest tednov, so bila vzorčena novo nastala ranitvena tkivain preiskana s svetlobnim mikroskopom. Ugotovljeno je bilo, da je sam potek dogodkov odvisen od globine poškodbe, to je tkiv, ki se med poškodovanjem pretrgajo in posledično tudi tkiv, ki ostanejo na eksponirani površini. Glede na ta tkiva so bili vzorci poškodb razdeljeni v tri tipe. Preraščanje najglobjih poškodb, kjer je bila skupaj s skorjo odstranjena tudi kambijeva cona, je potekalo preko naslednjih faz. Inicialna faza je pomenila nastanek kalusnih celic, sledil je nastanek ranitvene kambijeve cone v sredini kalusa, zatem ali včasih vzporedno s prejšnjo fazo je potekal nastanek ranitvenega felogena. Ko sta oba ranitvena meristema sklenjena, se je poškodba uspešno prerasla in začel se je nastanek ranitvenih derivatov obeh meristemov; periderm, ranitveni les in skorja. Zaporedje histoloških dogodkov je neodvisno od časa poškodovanja in vitalnosti dreves, oba dejavnika pa vplivata na hitrost nastajanja ranitvenih tkiv in s tem na hitrost preraščanja poškodb.

• Jezik: Slovenski jezik
• Ključne besede: ostrolistni javor(Acer platanoides L.), mehanske poškodbe, kalus, preraščanje, sezona, vitalnost, ranitvena tkiva
• Vrsta gradiva: Diplomsko delo
• Tipologija: 2.11 - Diplomsko delo
• Organizacija: BF - Biotehniška fakulteta
• Kraj izida: Ljubljana
• Založnik: [E. Bajuk]
• Leto izida: 2009
• Št. strani: XI, 41 str.
• PID: 20.500.12556/RUL-709
• UDK: 630*46:630*17(043.2)=163.6
• COBISS.SI-ID: 2424742
• Datum objave v RUL: 11.07.2014

Sekundarni jezik

• Jezik: Neznan jezik

Izvleček

The development of wound tissue was observed on Norway maple trees (Acer platanoides L.) which had their bark or even cambium removed from the trunk. The sequence of wound tissue development and the impact of time of injury and tree vitality on the process of wound overgrowth was investigated. Two vital and 2 handicaped trees were wounded in each of three parts of the growing season in 2005, 8-9 injuries on each tree. Every 3 to 4 days for at least 6 weeks after the injury samples of developing tissue were taken and observed with a light microscope. It was determined that the sequence of wound tissue development depended on the depth of the wounds, in other words on what tissue was torn away, and also on the tissue that remained on the wound surface. Depending on depth of wound all samples were divided into 3 groups. The deepest wounds where the cambium was removed with the bark responded in the following stages. The initial stage was the formation of callus cells followed by the formation of wound cambium within the callus. After that or sometimes in parallel with the previous stage the formation of wound felogen began. The wound was succesfully overgrown when both of the wound meristems were formed and began to produce wound derivatives; periderm, wound wood and bark. The sequence of events did not depend on wound time or vitality but bothof these factors had an influence on the speed of wound-closure process.