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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

Abstract: 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.
Keywords: navadna jelka, Abies alba, les, traheide, kambijeva aktivnost, diferenciacija, wood, silver fir, tracheids, cambial activity, differentiation
DiRROS - Published: 12.07.2017; Views: 1233; Downloads: 267
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2.
Sezonska dinamika ksilogeneze in floemogeneze pri navadni jelki (Abies alba Mill.)
Jožica Gričar, Primož Oven, Katarina Čufar, 2005

Abstract: Preučili smo dinamiko nastajanja ksilemskega in floemskega letnega prirastnegaplašča oz. branike pri navadni jelki (Abies alba) v rastni sezoni 2003. Vzorce floema, kambija in ksilema smo vsak teden vzeli iz dveh navideznozdravih odraslih jelk. Raziskave s svetlobnim mikroskopom so pokazale, da se je na floemski strani začela diferenciacija enega do dveh slojev floemskih derivatov še pred začetkom kambijeve aktivnosti. Kambijeva delitvena aktivnost se je začela hkrati na ksilemski in floemski strani v začetku maja. Kambijeva aktivnost se je zaključila konec avgusta. Diferenciacija terminalnih traheid kasnega lesa je potekala do konca oktobra, floemskih celic pa do konca septembra. Število celic, nastalih na ksilemski strani, je bilo večje kot na floemski. Zdi se, da je bila po obodu drevesa širina ksilemske branike bolj variabilna od floemske.
Keywords: navadna jelka, Abies alba Mill., kambij, ksilem, floem, traheide, sitaste celice, diferenciacija
DiRROS - Published: 12.07.2017; Views: 1155; Downloads: 280
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