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• W2318001200 abstract "Summary The author has attempted, in this study, to give a brief summary of the most relevant data on the chromosomes of the GENISTEAE Tribe by considering the results of both meiotic and somatic mitotic analysis. 1.—The taxa with chromosome levels of n = 11, 12, 14, 16, 24, 25 and some having n = 18, 20, 22, 23 display a normal diploid behaviour, in spite of the polyploid origins of several and a high degree of fertility, wich reveals the degree of equilibrium and stability reached by the genotype during its evolution. 2.—In certain taxa, particularly at levels n = 9, 18, 36 and 48, genotypic unbalances take place and are revealed in the degree of sterility (e.g. Genista lobelii ssp. longipes and G. pumila ssp. mugronensis, both having n = 9). These unbalances are further revealed in meiotic anomalies, typical of heterozygotes in reciprocal translocations, accompanied by sterility (e.g. Genista pumila ssp. pumila with n = 18). Unbalances are also noted by the presence of multivalent chromosomic configurations at D. and M-I together with sterility (e.g. Genista pseudopilosa, n = 36, Cytisus commutatus and C. ingramii, both with n = 48). 3.—Secondary associations of bivalents at M-I are particularly noticeable in taxa with n = 20 (Genista scorpius and G. haenssellerii), and are attributed, by the author, to their hiperploid character. Similar associations were found in other taxa, e.g. in Genista patens (n = 24), thus revealing a residual homology in the chromosome pairs involved. 4.—In Calycotome villosa, Cytisus baeticus and Chronanthus biflorus cases of endopolyploidy are observed and appear to indicate a possible evolutionary process of the Genisteae. 5.—A wide range of chromosome numbers exist in the Genisteae. From a study carried out on a total approximately of 129 taxa, the most certain in the author's opinion, being: n = 9, 11, 12, 14, 15, 16, 18, 20, 21, 22, 23, 24, 25, 26, 28, 36, 48 and 50. 6.—The Gen. Genista, is particularly noticeable among the Genisteae for its large variability in chromosome number (n = 9, 11, 12, 15, 16, 18, 20, 21, 24, 36, 48) and with a correspondingly large variability in phenotypes. 7.—Admitting that x = 8 is the primitive basic number of the Genisteae, the basic numbers given in table 2 for each genus, are considered to have evolved from the primitive number principally by aneuploidy or polyploidy. 8.—Among the 129 taxa studied cytologically, the proportion of polyploids is approximately 89 %, whilst that of the diploids is 10,8 %. Worthy of mention is the proportion of tetraploids, 76,8 %, which can be considered the optimum ploidic level of the Genisteae. 9.—There exist certain cases of intraspecific polyploidy, e.g. Genista lobelii ssp. longipes (n = 9 and n = 18), G. pumita ssp. mugronensis, G. pumita ssp. pumita (n = 9 and n = 18), G. tinctorea (n = 24 and n = 48), Chamaespartium tridentatum (n = 14, n = 28) etc. 10.—The results of a detailed caryotypic analysis made on 11 taxa is given here for ghe first time." @default.
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• W2318001200 date "1979-01-01" @default.
• W2318001200 modified "2023-09-26" @default.
• W2318001200 title "Chromosome variability in the Genisteae (Adams.) Benth. (Leguminosae)" @default.
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• W2318001200 doi "https://doi.org/10.1080/00837792.1979.10670177" @default.
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