桤木种源(家系)苗期根瘤固氮能力的遗传变异  

A Study on Genetic Variation of Nitrogen Fixation Ability During the Seedling Stage of Alnus cremastogyne

作　　者：王军辉[1] 顾万春[1] 夏良放[2] 余良富[2] 

机构地区：[1]中国林业科学研究院林业研究所,北京100091 [2]中国林业科学研究院亚热带林业实验中心,江西分宜336600

出　　处：《南京林业大学学报（自然科学版）》2004年第4期68-72,共5页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家"九五"科技攻关项目 ( 96-0 14 -0 3 -0 1);世界银行资助项目 (FRDPP)

摘　　要：对 1年生桤木种源 (家系 )苗期的根瘤固氮能力进行研究 ,结果表明 ,桤木苗期的根瘤鲜重、固氮酶活性、固氮量在种源间和种源内家系间都存在着显著或极显著差异 ;根瘤个数种源间差异不显著 ,种源内家系间差异极显著。根瘤个数、根瘤鲜重、固氮酶活性和固氮量的种源遗传力分别为 0 .176 0 ,0 .9172 ,0 .1199,0 .1896 ,首次揭示出根瘤鲜重为高度遗传 ,而其他 3个性状属于弱度遗传。根瘤鲜重、固氮酶活性和固氮量与生态梯度值 (EGA)的正相关均达到显著水平 。Provenance and family variation of nitrogen fixation ability during the seedling stage of Alnus cremastogrne were discussed. The random complete block design was adopted in the test.The result showed that except the number of nodule, there were significant or very significant differences for index of nitrogen fixation ability among provenances and single trees within provenances during the seedling stage of the alder. The heritabilities of the number of nodule,amount of nodulation,nitrogenase activity and amount of nitrogen fixation were (0.176 0),0.917 2,0.119 9 and 0.189 6,respectively,and it showed the amount of nodulation was genetically highly controlled.The correlation between the index of nitrogen fixation and EGA was significant.

关 键 词：桤木 种源 固氮能力 遗传参数 

分 类 号：S792.14[农业科学—林木遗传育种]