Chromosome Numbers of Some Saskatchewan Leguminosae With Particular Reference to Astragalus and Oxytropis

Abstract

Chromosome counts have; been obtained for 71 collections; seven tribes, 11 genera, and 39 species of the Leguminosae are represented. Pollen mother cells were collected in the field and examined in acetocarmine. Twenty of the species studied were in the tribe Galegeae: Astragalus 14 species, Oxytropis five species, and Glycyrrhiza one species. Twenty-nine of the counts have not been published before. Consideration is given to the phylogeny of Astragalus. Evidence suggests that Astragalus should be subdivided.

Studies on the cytology of legumes of Kashmir Himalaya. IV. Meiotic behaviour in 21 species of Astragalus L.

“…The frequency of such PMCs, however, was so low that these deviations, from the normal segregation pattern , do not appear to be due to any structural aberrations in the constituent chromsomes and can be explained on the basis of either partial failure of spindle apparatus leading to the presence of lagging chromosome/ bivalents or stickiness of chromsomes resulting in the formation of what appear like chro matin bridges. None of the earlier workers have reported any such anomaly in the species of Astragalus studied by them (Senn 1938, Ledingham 1957, 1958, Bijok et al 1972, Spellenberg 1974, 1976. Despite these anomalies the pollen stainability in these species was as high as 99.16% (A. hoffmeisteri var.…”

“…In view of the significance of this study it is surprising to find that in an easily accessible material, like the species of Astragalus, only scanty information regarding the reduction division of only 300 of its 1600 species (18.75% only) is on record (Senn 1938, Ledingham 1957, 1958, Bijok et al 1972, Spellenberg 1974, 1976. This information too is limited to the number of bivalents per pollen mother cell (PMC).…”

THE BIOLOGY OF CANADIAN WEEDS.: 76. Vicia angustifolia L.,V. cracca L., V. sativa L., V. tetrasperma (L.) Schreb. and V. villosa Roth.

“…angustifolia which follows Fernald (1950 (Fig. 2), numerous, bluish-purple, 9-13 mm long; legume light brown, flat,2-3 cm long, at maturity splitting into two twisted halves; seeds rounded to oval, 2.5-3.5 mm long, reddish brown, sometimes slightly mottled; chromosome numbers for Canadian material'.2n : 14 (Taylor and Mulligan 1968), 2n : 28 (Ledingham 1957; Tomkins and Grant 1978). Rousi (1961) has demonstrated that three chromosome races exist 2n : 12, 14, and 28.…”

Legumes of the north-central states: Galegeae

“…The various cytological studies in Astragalus indicate that the chromosome number is multibasic (Head 1955» Vilkomerson 1943, Ledingham 1957 A. agrestis is frequently mistaken for the related A^ striatus from which it can be distinguished by its rhizomatous habit, long villous pods, and basifixed pubescence. A^ agrestis has also been confused with A.…”

“…• The somatic chromosome number of A^_ spatulatus is reported to be 24 (Ledingham, 1957 According to Ledingham (1957) • e According to Barneby (1951a) this species is represented in our region by the variety viridis. The above list of synonymy includes only those names involved with variety viridis.…”