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1.
Differentiation of last formed tracheids in wood of silver firs (Abies alba) having various cambial productivity
Jožica Gričar, Aleš Straže, Katarina Čufar, 2003

Povzetek: To examine the state of differentiation of the last tracheids formed in wood and the duration of cambial activity, samples of wood and cambium were taken from mature silver fir (Abies alba) trees having various cambial productivity.Semi-thin cross-sections of wood sampled in July and October, 1999, were stained with toluidine blue and observed under a light microscope. In July, three different phases of current annual xylem growth ring formation were found, as a result of various cambial tree productivity. In October, the cell divisions in the cambium were completed in all investigated trees, while the process of differentiation was not entirely completed in trees with a more productive cambium. The number of undifferentiated tracheids was higher in trees having a more productive cambium. In these trees, the cambial activity and the differentiation ended later. In declining trees, the number of cells produced by the cambium was lower and the duration of cambial activity was shorter.
Ključne besede: navadna jelka, Abies alba, les, traheide, kambijeva aktivnost, diferenciacija, wood, silver fir, tracheids, cambial activity, differentiation
DiRROS - Objavljeno: 12.07.2017; Ogledov: 921; Prenosov: 84
URL Celotno besedilo (0,00 KB)
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2.
Dinamika ksilogeneze pri gradnu v letu 2007
Jožica Gričar, 2008

Povzetek: S svetlobnim mikroskopom smo raziskali sezonsko dinamiko nastanka lesa pri gradnu (Quercus sessiliflora Salisb.) v rastni sezoni 2007. Konec marca so se delitve v kambiju že začele in število celic je naraslo na 10-11 slojev. Maksimalno celično produkcijo smo na ksilemski strani zabeležili v drugi polovici maja, ko smo ugotovili prek 100 ?m prirastka na teden. Kambijeva aktivnost se je zaključila do sredine avgusta in število celic je upadlo na 5-7 slojev. Oblikovanje sekundarne stene in lignifikacija v terminalnih celicah kasnega lesa pa sta potekala še nadaljnjih 4-5 tednov. Dinamika nastanka lesa pri gradnu se razlikuje od debelinske rasti iglavcev.
Ključne besede: Quercus sessiliflora, ksilogeneza, kambijeva aktivnost, traheja, rani les, kasni les
DiRROS - Objavljeno: 12.07.2017; Ogledov: 884; Prenosov: 83
URL Celotno besedilo (0,00 KB)
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