浙江天童国家森林公园红凉伞交配系统研究  

THE MATING SYSTEM OF ARDISIA CRENATA VAR. BICOLOR (MYRSINACEAE), A SUBTROPICAL UNDERSTORY SHRUB, IN TIANTONG NATIONAL FOREST PARK, ZHEJIANG PROVINCE

作　　者：陈小勇[1] 厉宁[1] 沈浪[1] 

机构地区：[1]华东师范大学环境科学系,上海200062

出　　处：《植物生态学报》2001年第2期161-165,共5页Chinese Journal of Plant Ecology

基　　金：国家自然科学基金项目 !(39870 12 8)

摘　　要：交配系统是影响植物种群遗传结构的重要因素之一 ,测定植物的交配系统不仅可以了解物种的繁殖格局 ,而且也有助于预测生境条件发生变化 (如生境片断化 )时物种遗传结构的变化趋势。红凉伞是常绿阔叶林伴生小灌木 ,雌雄同花。采用水平切片淀粉凝胶电泳法分析种子萌发幼苗的基因型 ,结合 Ritland异交率估算模型(ML T) ,测定了浙江天童国家森林公园红凉伞的交配系统 ,共采用了 3个酶位点 (Adh- 1,Fe- 2和 Amp- 2 )。两个红凉伞种群的异交率均大于 1,分别为 1.0 5 5和 1.15 9,可能是由于处理过程中将小的集群合并处理的结果 ,因为小集群内家系数量少 ,无法计算异交率。计算的家系异交率大多很大 ,只是在小集群内存在异交率低的家系 ,表明当红凉伞聚生形成的集群内开花个体数少时 ,异交率将降低。Mating system is an important factor affecting the genetic structure of plant populations. Determining mating system can aid in the understanding of reproductive patterns of plants, and help predict the trend of genetic structure of plant populations following environmental change, such as habitat fragmentation. Ardisia crenata var. bicolor, a hermaphrodite species, is an understory shrub of evergreen broad-leaved forests in East China. Three polymorphic loci ( Adh-1, Fe-2 and Amp-2 ) were analyzed to determine the mating systems of two A. crenata var. bicolor populations. Multiple loci outcrossing rates of the two populations were 1 055 and 1 159, respectively. This may represent a combination of several small groups into large populations as a small number of families in groups can not be used to calculate the multilocus outcrossing rate. Low outcrossing rates were found in families of small groups but not in those of large groups, indicating that outcrossing rate will be reduced with small population size or low density of flowering plants. We discuss the effects of fragmentation of evergreen broad-leaved forests on the mating system of A. crenata var. bicolor populations.

关 键 词：等位酶 异交率 红凉伞 天童国家森林公园 交配系统 植物 

分 类 号：Q346[生物学—遗传学]