摘要
采用遗传排除法和似然分析法进行青冈幼苗的亲本分析。共采用了 5个等位酶多态位点 ,累积排除概率为 71 .57%。采用遗传排除法仅能为 1株幼苗确定唯一的亲本 ,其余幼苗均有多个亲本。似然分析揭示出各幼苗有 1或 2对亲本 ,分析表明由成体自交形成的幼苗占41 .1 8% ,与种群个体间交配的概率也较大 ,为 1 7.65%。成体之间的繁殖成功率变化较大 ,有9个个体的繁殖成功率为 0。个体 2 4的繁殖成功率最大 ,占总的 39.4% ,种群外花粉和种子对幼苗的贡献率达 1 8.4%。根据幼苗与亲本间的距离计算的种子扩散距离以 5～ 1 0 m最多 ,占 62 .5% ;其次为 1 0～ 1 5m,而扩散距离为 0～ 5m的种子比例最小 ;虽然青冈主要是以重力扩散种子 ,但由于坡度较大 ( 30°) ,加上树冠遮荫对种子萌发和幼苗生长的影响 ,形成以上种子扩散格局。
Parentage of Cyclobalanopsis glauca seedlings in a small population was analyzed by genetic exclusion and most likely analysis using five polymorphic isozymic loci.The cumulative exclusion probability was 71 57%.Genetic exclusion only identified one parent pair for one seedling,and most seedlings have more than one pair of parent.Likelihood analysis identified one or two parent pairs for the seedlings.41 18% of the total seedlings were grown from seeds produced by selfing and 17 65% of the seedlings were from seeds fertilized with pollen out of the population.Reproductive success (RS) of adults varied greatly.RS of nine adults was 0,and individual No.24 had the highest RS(39.4%).The RS of plants out of the population was 18 4%. Dispersal distances of C.glauca seeds calculated according to the distance of seedling to parent were mainly 5~10 m(62 5%),secondly was 10~15 m and only 3 1% was <5m.Though gravity is the main mechanism of seed dispersal,there were less seeds with short distance dispersal due to high slope (30°) and effects of tree canopy on the seed germination and seedling development.
出处
《武汉植物学研究》
CSCD
2000年第3期174-180,共7页
Journal of Wuhan Botanical Research
基金
国家自然科学基金资助项目!( 3 93 70 1 3 5)
关键词
遗传排除
似然分析
亲本分析
幼苗
青冈
种群
Genetic exclusion, Likelihood analysis, Parentage analysis, Seedling, Cycloba lanopsis glauca
