Razmerje med ksilemskim in floemskim prirastkom pri različno vitalnih jelkah (Abies alba Mill.)

diplomsko delo (visokošolski strokovni študij)

Luka Krže (Avtor), Primož Oven (Recenzent), Katarina Čufar (Mentor)

Povzetek

Pri 10 navidezno zdravih navadnih jelkah (Abies alba Mill.) z Ravnika smo proučevali anatomsko zgradbo floemskih branik v odvisnosti od njihove širine. Ugotavljali smo razmerje med floemskim in ksilemskim prirastkom in razlike v številu celic v radialnih nizih floemskih in ksilemskih branik po obodu posameznega drevesa. Raziskovali smo zvezo med širino floemske in ksilemske branike, nastale v istem letu ter številom celic v dormantni kambijevi coni. Vzorce tkiv smo odvzeli iz živih dreves z metodo vzorčenja intaktnih tkiv. Trajne anatomske preparate prečnih prerezov smo obarvali z barvilom safranin in astra modro ter jih preiskali pod svetlobnim mikroskopom. Rezultati kažejo, da je bila pri navadni jelki anatomska zgradba floemske branike odvisna od njene širine. Floemske branike so vsebovale 5 do 11 slojev celic. (sl.c.). Največkrat so bile sestavljene iz 3 oz. 4 sl.c ranega floema. Bolj ali manj sklenjen tangencialni pas aksialnega parenhima je ločil rani floem od kasnega. Ta je bil najpogosteje sestavljen iz 1 do 3 sl.c. Pri širokih floemskih branikah (8,9 ali 11 sl.c.) se je v kasnem floemu priložnostno pojavil še drugi, nesklenjen pas aksialnega parenhima. Pri ozkih floemskih branikah (5 do 6 sl.c.) je prevladoval rani floem, pri širših (11 sl.c.) pa kasni. Delitve kambijevih celic so bile na ksilemsko stran intenzivnejše, saj so bile ksilemske branikw od 2 do 21 krat širše kot floemske. Ksilemske branike so bile široke od 8 do 177 sl.c. Razlike v številu celic v različnih radialnih nizih po obodu drevesa znotraj iste branike so znašale na ksilemski strani do 103, na floemski pa do 4 sl.c. Dormantna kambijeva cona je vsebovala od 5 do 11 sl.c. Kadar je bila kambijeva cona ozka (5 ali 6 sl.c.), sta bili tudi ksilemska in floemska branika ozki; kadar pa je bila široka (9, 10 ali 11 sl.c.). sta bili široki tudi pripadajoči braniki,

Ključne besede

navadna jelka (Abies alba Mill.);prirastek;ksilem;floem;kambijeva cona;

Podatki

Jezik:	Slovenski jezik
Leto izida:	2006
Izvor:	Ljubljana
Tipologija:	2.11 - Diplomsko delo
Organizacija:	UL BF - Biotehniška fakulteta
Založnik:	[L. Krže]
UDK:	630*811.1
COBISS:	1424009
Št. ogledov:	1370
Št. prenosov:	337
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarni naslov:	ǂThe ǂrelation between xylem and phloem increment in silver firs (Abies alba Mill.) of different vitality
Sekundarni povzetek:	The structue of phloem growth rings was studied in relation to their width in 10 apparently healthy European silver firs (Abies alba Mill.) from Ravnik, Slovenia. The relation between phloem and xylem increment and variation in number of phloem and xylem cells within different radial rows of the same ring were researched. Further, the relation between the phloem and xylem growth rings formed in the same year, and the corresponding number of cells in dormant cambium zone were investigated. The tissues were taken from living trees using the method of intact tissue sampling. The investigations were done with a light microscope on permanently imbedded cross-sections, stained with safranin and astra blue. The results show that the structure of the phloem growth ring depends on its width. The phloem increment comprised 5 to 11 sieveve cells, mostly with 3 to 4 layers wide early phloem. More or less continous tangential band of axial parenchyma usually separated the early and the late phloem. The late phloem was generally 1 to 3 cells wide. Wider phloem rings (8,9 and 11 cell layers) some times contained an additional discontinuous tangential band of axial parenchyma. Narrow phloem rings (5 to 6 cell layers wide) contained more early than late phloem, whereas wider rings (11 cell layers) contained more late phloem. The cambium produced more xyxlem than phloem cells. The xylem rings were 2 to 21 times wider than the corresponding phloem ones. The xylem rings were 8 to 177 cells wide. The differences in the number of cells within different radial rows of the same rings comprised up to 103 cells in xylem rings, and up to 4 cells in phloem rings. The dormant cambium zone contained 5 to 11 cell layers. When the cambium zone was narrow (5 to 6 cell layers wide) the xylem and phloem rings were narrow as well. When the cambium zone was wide (9, 10 or 11 cell layers) the xylem and phloem rings were also wide.
Sekundarne ključne besede:	silver fir (Abies alba Mill.);increment;xylem;phloem;cambium;
Vrsta dela (COBISS):	Diplomsko delo
Strani:	IX, 48 f.
Ključne besede (UDK):	applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;agriculture and related sciences and techniques;forestry;farming;wildlife exploitation;kmetijstvo ter sorodne vede in tehnologije;forestry;gozdarstvo;forest products and their utilization;gozdni proizvodi in njihova uporaba;
ID:	21015