Secondary Chromosome Associations in Uraria picta (Jacq.) DC (Family: Leguminosae)
2010 年 75 巻 1 号 p. 37-40
詳細
2010 年 75 巻 1 号 p. 37-40
The meiocytes of Uraria picta (Jacq.) DC (Family: Leguminosae; Papillionoide; annual medicinal herb) had n=11 chromosomes with an average chromosomal association of 0.11 IV+10.29 II+0.98 I per cell at diakinesis and metaphase I. The bivalents formed rods (rods: 1–11/cell, 6.95±0.22; rings: 0–9/cell, 3.59±0.25/cell) mostly at MI with mean chiasma of 14.22±0.24 (8 to 20) per cell. Formation of 11 II in PMCs was predominant (62.71%). About 11.25% of the cells had a ring quadrivalent. All AI cells were cytologically balanced (11/11) with an average pollen fertility of 97.58%. A persistant feature in 100% diakinesis and MI cells was the presence of secondary association of chromosomes and the chromosomes assorted themselves into variable groups of 2 (0.85%), 3 (5.08%), 4 (7.63%), 5 (11.86%), 6 (42.37%), 7 (19.49%), 8 (3.39%), 9 (2.54%) and 11 (1.69%). Out of 52 different chromosomal associations among the group classes, 3 II(1)+2 II(3)+1 II(2)−16.10% (6 group class) was most frequent.
