1972
DOI: 10.1007/bf00319956
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Chiasmata and the breeding system in wild populations of diploid wheats

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Cited by 60 publications
(31 citation statements)
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“…Increases in mean cell chiasma frequency generally result in chiasmata being formed in these interstitial regions with concommitant breakup of supergene complexes normally inherited as units. Again this situation is similar to that described in Lolium and Festuca by Rees and Dale (1974), in wheat by Zarchi et a!., (1972Zarchi et a!., ( , 1974 and in rye by Jones (1974).…”
Section: Resultssupporting
confidence: 88%
“…Increases in mean cell chiasma frequency generally result in chiasmata being formed in these interstitial regions with concommitant breakup of supergene complexes normally inherited as units. Again this situation is similar to that described in Lolium and Festuca by Rees and Dale (1974), in wheat by Zarchi et a!., (1972Zarchi et a!., ( , 1974 and in rye by Jones (1974).…”
Section: Resultssupporting
confidence: 88%
“…Interspecific variations in both chiasma frequency and chiasma distribution have been extensively studied and described (e.g., John and Lewis, 1965), but there have been relatively many fewer studies of intraspecific chiasma variation. Significant levels of chiasma frequency variation have been previously reported between populations of Melandrium (Lawrence, 1963), Lolium perenne, L. italicum and Festuca pratensis (Rees and Ahmad, 1963;Rees and Dale, 1974), Chorthippus parailelus, Omocestus viridulus and Myrmeleotettix maculatus (Hewitt, 1965) Phaulacridium marginale (Westerman and Fontana, 1973), Metrioptera brachyptera (Southern, 1968), Triticum ion gissimum (Zarchi et. al., 1972) and Cepaea nemoralis and C. hortensis (Price, 1974(Price, , 1975.…”
Section: Discussionmentioning
confidence: 93%
“…By growing plants from different populations in one randomised experiment under uniform conditions possible environmental effects on chiasmata were minimised but the possibility of genotype x environment interactions remained (Zarchi et a!., 1972). In order to investigate this possibility, plants from the ED population of Crepis capillaris grown in experimental conditions were compared to plants of the same population growing in their native habitat; their mean chiasma frequencies were found to be very similar (3.88 and 380 respectively) and not significantly different (t(38) = 102; P>030).…”
Section: Results (I) Procedural Problemsmentioning
confidence: 99%
“…Regression analyses carried out to ascertain the relationship between segment frequency of the population (in angles) and various climatic In some organisms the presence of supernumerary heterochromatin has a pronounced effect on either or both the mean number of chiasmata per cell (John and Hewitt, 1965a, b;Hewitt and John, 1968;Westerman, 1969; Zécevi and Paunovi, 1969;Zarchi et al, 1972) and on between cell variance of chiasma frequency (Jones and Rees, 1967). When populations in which either B chromosomes or segments were present alone were analysed separately, in no case did the extra heterochromatin appear to have any effect on either mean chiasma frequency or log variance (see tables 5 and 6), and neither were any consistent trends (see were the polymorphisms extensive.…”
Section: Resultsmentioning
confidence: 99%
“…It is known that such polymorphisms for supernumerary heterochromatic material are widespread in both plants and animals (see Battaglia, 1964;White, 1973). Although much has been learned of the probable role of this extra heterochromatin in natural populations (John and Hewitt, 1 965a, b;Westerman, 1969Westerman, , 1970Puteyevsky and Zohary, 1970;Shaw, 1971;Zarchi et al, 1972), to date no detailed studies have been done on species in which both supernumerary chromosomes and segments co-exist in the same individuals. Westerman and Fontana (bc.…”
Section: Introductionmentioning
confidence: 99%