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• W1509314501 abstract "Chromosome studies in Bomarea and Alstroemeria (ALstroemeriaceae). Chromosome numbers were determined and observations were made on the meiotic behavior of Bomarea setacea (Ruiz et Pavon) Herbert (n = 9) from Colombia, here investigated cytologically for the first time, Bomarea edulis (Tussac) Herbert (n = 9), Alstroemeria psittacina Lehmann (n = 8) and Alstroemeria aurea Graham (n = 8). The materials from the last three species were collected in Argentina. The differences in chromosome number and size between Alstroemeria L. and Bomarea Mirbel are emphasized, the latter genus having smaller chromosomes. Other morphological differences are also pointed out. It is suggested that Alstroemeria (x = 8) may have derived from Bomarea (x = 9) by translocation of essential genetic material to other chromosomes, loss of a centromere and addition of repetitive DNA in all chromosomes. The taxonomic relationships between Alstro emeria L. and Bomarea Mirbel, two closely re lated genera in the Alstroemeriaceae, are rather controversial. With the aim of clarifying their systematic position, karyological observations were made on two Alstroemeria and two Bomarea species from South America that were available to us. Even when the results are rather preliminary, due to the low number of species that were studied, it is believed that they will contribute to help to understand some of the differences of these two taxa and their possible evolutionary relationships. aurea3 (n = 8), A. psittacina (n = 8) and Bomarea edulis (n = 9) is the same as was reported by p evious authors (see below). B. setacea (n = 9) had not been studied previously. Chromosome morphology of several species of Alstroemeria was analyzed by Taylor (1926), Why e (1929), Sato (1938) and by us (Fig. 2A). Taylor and Whyte classified the 8 chromosome pairs ofA brasiliensis and A. aurea in 6 classes. The eight chromosome pairs may be numbered according to their decreasing length and de scribed after Taylor's and Whyte's observations on their somatic appearance and following Levan et al.'s (1964) classification: n° 1 = largest, m; n° 2 = large st in A. brasiliensis (Taylor, 1926) or large sm in A. aurea, with a secondary constric tion in the long arm (Whyte, 1929); n° 3 = t, with a proximal microsatellite; n° 4, 5 and 6 = t chro mosomes of intermediate size; n° 7 = small sm; n° 8 = smallest chromosome, m. Our preliminary observations on A psittacina anaphase I chromo somes (Fig. 2 A) allow us only to distinguish these chromosome types on the basis of size and centromere position; it was not possible to ob serve microsatellites or secondary constrictions in anaphase I (Fig. 2 A). Chromosome 2 in A. psittacina seems to be sm and pairs 7 and 8 seem to be m. MATERIALS AND METHODS Young inflorescences were fixed in modified Newcomer (Hunziker, 1966). Anther smears were stained in 45% acetocarmine 1%. The lo calities where the materials were collected and the herbaria where the specimens are deposited are indicated in table 1. The nomenclature used for chromosome types is that of Levan et al. (1964). RESULTS AND DISCUSSION In all four species the meiotic behavior is regular with formation of bivalents (Table 1, Figs. 1, 2). The numbers found in Alstroemeria Bi alents 1 and 2 were easily identified at metaphase I in our materials of A. aurea (Fig. 1 C-H) and A. psittacina (Fig. 2) because of their 1 Miembro de la Carrera del Investigador Cientifico (CONICET). a Miembro de la Carrera del Investigador Cientifico (CIC). ® In this research we follow the recent taxonomic treatment by Bayer(1987) and the evaluation by Lauener(1984)." @default.
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• W1509314501 title "Chromosome studies in bomarea and alstroemeria (alstroemeriaceae)" @default.
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