摘要
一个树种的群体交配系统（Ｍａｔｉｎｇｓｙｓｔｅｍ）提供了该树种是如何将其遗传物质从一个世代传递到下一个世代的基本信息。因此交配系统研究可有助于：（１）推测群体的基因型组成；（２）分析多基因位点连锁不平衡程度；（３）推测种子园的种子质量及提供种子园营建设计的有关信息；（４）在一定的程度上，可用于分析天然群体的遗传结构分化水平。在落叶松的１０个种和３个变种中，目前已报道了２个种的交配系统：一个是美洲落叶松（Ｌ．ｌａｒｉｃｉｎａ［ＤｕＲｏｉ］Ｋ．Ｋｏｃｈ），另一是欧洲落叶松（Ｌ．ｄｅｃｉｄｕａＭｉｌｅｒ）。我国兴安、长白及华北落叶松的交配系统的研究尚未进行。本研究目的就是应用同功酶标记：（１）测定和比较这３个兴安落叶松种间及种内群体的异交率；（２）比较与其它针叶树的交配系统差异；（３）推测群体内自交或双亲近交发生的可能性。本文采用淀粉凝胶电泳技术，应用由６个酶系（ＰＧＩ，ＭＤＨ，６ＰＧＤ，ＡＡＴ，ＰＧＭ及ＳＤＨ）产生的７个多态性位点的同功酶标记分析了我国３个落叶松种（兴安、长白及华北落叶松）的共９个天然群体交配系统。结果发现兴安落叶松的加格达奇（内蒙古）群体表现出几乎完全的异交（ｔｍ＝０．９８６±０．０８１）。华?
Mating systems of nine natural populations of the three Chinese Larix taxa ( L.gmelinii (Rupr.) Rupr., L.principis rupprechtii Mayr. and L.olgensis Henry) were scored using seven polymorphic loci of allozyme markers generated by six enzymes (PGI,MDH,6PGD,AAT,PGM and SDH). It was observed that population Jiagedaqi of L.gmelinii in Inner Mongolia exhibited nearly total outcrossing ( t m=0 986±0 081). Two populations of L. principis rupprechtii , Fengning in Hebei Province and Hunyuan in Shanxi Province, shared no significant difference from random outcrossing ( t m=0.847±0.427～0.792±0.169) . However, mating system was variable among populations of L.olgensis. Two populations, Xiaobaihu in Heilongjiang Province and Changbai in Jilin Province, exhibited significant level of selfing ( t m≈0.705) . One population, Dahailin in Heilongjiang Province, exhibited inbreeding in addition to selfing, with t m being 0.684±0.107, and the other three populations of L.olgensis , Baihe in Jilin Province, Baidaoshan and Dongfanghong in Heilongjiang Province, exhibited predominantly outcrossing, t m =0.847±0 427～1.203±0.371. These results were comparable to those reported in other conifers including L.laricina K.Koch and L.decidua Miller.
出处
《林业科学》
EI
CAS
CSCD
北大核心
1999年第1期21-31,共11页
Scientia Silvae Sinicae
关键词
兴安落叶松
长白落叶松
华北落叶松
交配系统
Larix gmelinii (Rupr.) Rupr., L.olgensis Henry, L.principis rupprechtii Mayr., Mating system
