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Chromosome morphology and cytogenetics in the genus ranunculus l
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Chromosome morphology and cytogenetics in the genus ranunculus l
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Chromosome morphology and cytogenetics in the genus ranunculus l
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Dissertation
Chromosome morphology and cytogenetics in the genus ranunculus l
1966
Overview
lJ.'hewor-kin this thesis originated with the desire to increase the uuderstall.ding of the genus Ranunculus in Br-i tain p:t'ima.:rily by a study of the chromosomelllorpholo., of Hrit1si, species, excluding the subt;enua Batrach1um (D.C.) A.Grt , and comparison with work published on ma.teria.l from Suro • At the same time it wa.s considered that oytoe; enetic stu41ee help to elucidate the relationships between some of the taxonomically difficult speoies, particularly in tile fi.bulbosus A range of teohniques hav been used including detailed karyotyp= analysis, experimental b.;ybridlzation, induotion of polyploidy by colchioine and analysi,sot meiotic chromosome pairing. From an initial cytological 1nvestiga.tion of many species everal points of interest were found. 1116occurrence of accessory chromosomes in British material as more widespread than expected, some of the karyotypes were irregular and polyploidy was evident. lJ.1le finding of a new polyploid count of 2n - 48 for R. flammula (usually 2n ... 32) and new aneuploid eOUJ1tefor li. lingua. (2ft .. 125-132) s' eted an :I.nve ti tioD be carried out on the relationship bet\" en these morphologically Similar speoies. As uah information as possible was therefore accumulated on the occurrence and transmission of aece sory chromosomes in those species oarr,ying them and thi has be 11 presented as a first ch.apter ( ) to the thesis. Cyto ne'tio studies on the seleoted taxa tu\" pres'ented in two following chapters (B and a). The first deals with karyotype studies, experimental hybridization and eiotic behaviour in the 0106ely allied species R•. flam la and R. lingua. and the second v/ith a similar i.JIY\"'i,pu.ou of the • bulb08Ua. re t. aD of' 1ts allied species.
Publisher
ProQuest Dissertations & Theses
Subject
