摘要
采用性腺败育(GD不育)作为标准检定方法。对我国20个地方的黑腹果蝇的P因子活性和细胞型进行了测定。结果表明我国北部沿海城市为Q型;南部沿海和内地皆为M型。各地的M品系所产生的GD不育能力各不相同,但表现出与地理位置相关的梯度变化。这一变化规律为研究我国黑腹果蝇的P因子起源及P和M品系的形成提供了重要的理论依据。
This paper reports an extensive survey of Chinese D.melanogaster strains with respect to their dysgenic potential in the P-M system and the geographical distribution.Using gonadal dysgenesis (GD) as the standard method of assays,we have measured the P element activity and cytotypes of 20 local strains recently collected from various parts of China.Of the 20 strains,two from the northern part of the eastern coast are of the Q type; the rest are all of the M type; none is of the P type.The GD frequencies in cross A are different with the areas,but show a gradational change with geographic position.The farther the distance from the Q area,the higher the GD frequency is.This suggests that Chinese D.melanogaster populations seem to be a cline in P-M gonadal dysgenesis potential,and the distribution of the number of genomic P elements shows a radiate papttern,in which Q area is the centre.From the centre to west,south and north,the number gets lower and lower with an increase of distance.The pattern indicates that the P elements of Chinese local populations come from the Q area.However only by the present survey,it is uncertain whether the P elements originate from Chinese population or come from foreign one.
基金
中国科学院科学基金
关键词
P转座因子
杂种败育
GD不育频率
P family of transposable elements,Hybrid dysgenesis,Cytotype,GD frequency
