Sezonska dinamika ksilogeneze in floemogeneze pri navadni jelki (Abies alba Mill.)
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.
The dynamics of xylem and phloem growth ring formation in silver fir (Abies alba Mill.) was studied during the growing season 2003. Blocks of tissue, containing phloem, cambium and outer xylem, were taken weekly from two apparently healthy silver fir trees. According to the observations of transverse sections under light microscope, the cambial cell divisional activity began in early May on the phloem and xylem side simultaneously. Priorto this activity, differentiation of one or two layers of the phloem derivatives began to take place. Cambial activity ceased at the end of August.Differentiation of the terminal late wood tracheids adjacent to cambiumwas completed by the end of October and of the phloem cell by the end of September. Cell production on the xylem side of healthy firs was more intense and the variability in widths of the growth rings across the stem circumference was also greater compared to the phloem.
2005
2017-07-12 09:18:44
1060
navadna jelka, Abies alba Mill., kambij, ksilem, floem, traheide, sitaste celice, diferenciacija
silver fir, cambium, xylem, phloem, tracheids, sieve cells, differentiation
r2
Jožica
Gričar
70
Primož
Oven
70
Katarina
Čufar
70
UDK
4
630*182
ISSN pri članku
9
0351-3114
URN
14
URN:NBN:SI:doc-D9VX65W2
COBISS_ID
3
1687206
OceCobissID
13
6206978
RAZ_Gricar_Jozica_i2005.pdf
842708
Predstavitvena datoteka
2017-07-18 12:13:18