كليدواژه :
ماهواره , پيچيدگي ثانويه , مورفولوژي , زاگرس , كشاورزي , گياهشناسي , گونه هاي بومي ايران , كروموزم ها , هتروكرومايتن سي
چكيده لاتين :
Fritillaria zagrica is an endemic species of Iran. It is distributed all along the Zagros mountain chain and is characterized morphologically by the distinctly dark purplish - brown flowers with a yellow apex. Its karyotype consists of two metacentric, five subtelocentric and five telocentric chromosome pairs. In all metaphase plates only one pair of satellite - bearing chromosomes was found. C - banding pattern is characterized by the following major C - bands: centromeric bands occur in the short arms of chromosome pairs Nos. 2-3, 5-8, 10 and 12, and on the long arms of pairs Nos. 2, 4, 8-10 and 12; distinct intercalary bands exist in the short arms of pairs Nos. 1 and 6, and on the long arms of pairs Nos. 4, 6 and 11; telomeric bands occur on the short arm of pairs Nos. 1-3, 7 and 9-11 and on the long arms of pairs Nos. 2-3. Bands at secondary constrictions are found on the short arm of pair No. 3. the short arms of chromosome pairs Nos. 3 (including satellites) and 1 and were entirely heterochromatic. Apart from these, there are some indistinct or dot - like bands in the complements, varying in number and general appeatance from cell to cell. Heteromorphy for band width was observed in the pairs Nos. 2-3, 6, and 8. In addition to the normal complement (A chromosomes), 0-4 accessory B-chromosomes were observed in poplations GBK 20 and GBK 38. These chromosomes were of equal size and each had a terminal band, which suggests that they were probably telomeric and identical. Interphase nuclei exhibited a relatively heterogeneous matrix of chromocenters, varying in number and size. There were often a small number of big and distict chromocentres which at least in part may by related to B-chromosomes.
