Naslov
Raznolikost veličine područja nukleolarnih organizatora (NOR) između jedinki istih vrsta hrasta (Q. robur i Q. petraea)
(Size variation of nucleolar organizing region (NOR) between different seedlings of the same oak species (Q. robur i Q. petraea))

Autori
Zoldoš, Vlatka ; Siljak-Yakovlev, Sonja ; Besendorfer, Višnja ; Papeš, Dražena

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Zbornik sažetaka priopćenja šestog kongresa biologa Hrvatske / Huber, Đ. - Zagreb : Hrvatsko biološko društvo, 1997

Skup
Šesti Kongres Biologa Hrvatske

Mjesto i datum
Opatija, Hrvatska, 22.09.1997. - 26.09.1997

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
Quercus robur; Q. petraea; NOR; florescencijsko bojenje
(Quercus robur; Q. petraea; NOR; fluorescent staining)

Sažetak
Nucleolar organizing region (NOR) is chromosomal locus of the eucariotic ribosomal DNA genes coding for the 18S-5.8S-28S rRNA. Number of NORs is species-specific but sometimes it can vary between individuals of the same species and even between cells of the same plant. Size variation and rarely number variation of NORs between different plants of the same oak species (Q. robur and Q. petraea) is noticed after chromomycin fluorescent staining. Fluorescent in situ hybridization (FISH) confirmed that chromomycin positive signals were really regions of ribosomal genes. NORs had tendency to fuse together which can lead to unequal rearangements of the ribosomal genes on two homologoue chromosomes and therefore, to NOR-size variation. NORs showed satellite behaviour. They were also frequently detached from the satellite chromosomes and appeared as free spherical chromomycin positive fragments. In mitosis, they formed anaphase bridges or lag after their anaphase group. In meiosis, when chromosomes were maximally contracted, they were always located on two homologues forming bivalent and segregation was regular.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA