中文摘要：

采用PCR和直接测序的方法测定灰胸竹鸡（Bambusicola thoracica）与棕胸竹鸡（B.fytchii）线粒体DNA（mtDNA）控制区1142bp的序列,分析二者间的遗传变异。两种竹鸡间共发现32个变异位点,其中20个转换,12个颠换。灰胸竹鸡mtDNA控制区的碱基含量T34.26%、C25.98%、A24.84%和G14.96%,棕胸竹鸡的分别是T34.47%、C25.60%、A25.03%和G14.93%。t-检验分析显示,两种竹鸡mtDNA控制区的T和C含量差异显著。在系统发生树上,两种竹鸡在系统发生树各聚成一支,支持率达到100%。两种竹鸡间的遗传距离是0.0396。根据分子钟计算,它们大约在200万年前分歧进化。推测它们的物种形成主要受更新世第二次寒冷期的影响。

英文摘要：

Polymerase chain reaction and direct sequencing methods were used to analyze the genetic variation between Bambusicola thoracica and B.fytchii.A total of 1 142 nucleotides of the mitochondrial DNA control region were sequenced.There are 32 variable positions,with 20 transitions and 10 transversions.The nucleotide composition of B.thoracica mtDNA D-loop was：34.26% T,25.98% C,24.84% A and 14.96% G.That of B.fytchii was：34.47% T,25.60% C,25.03% A and 14.93% G.There were very significant differences in T and C nucleotide composition between the two bamboo partridges.The phylogenetic tree grouped two bamboo partridges into two deeply divergent clusters（supported by BP=100%）.Genetic distance was 0.039 6 between the two partridges.Calibrated rates of molecular evolution suggested that they could have speciated 2.00 million years ago,affected by the Pleistocene second frigid.