尾叶桉早期速生和抗病无性系选择研究  

Genetic Analysis on Early Growth and Disease Resistance Traits of Eucalyptus urophylla

作　　者：关则崧 杨会肖[2] 王保华 徐计崧 廖焕琴 陈新宇 潘文[2] 杨晓慧[2] GUAN Zesong;YANG Huixiao;WANG Baohua;XU Jisong;LIAO Huanqin;CHEN Xinyu;PAN Wen;YANG Xiaohui(Yangjiang State-owned Forest Farm,Yangjiang,Guangdong 529500,China;Guangdong Provincial Key Laboratory of Silviculture,Protection and Utilization/Guangdong Academy of Forestry,Guangzhou,Guangdong 510520,China)

机构地区：[1]阳江市国有阳江林场,广东阳江529500 [2]广东省森林培育与保护利用重点实验室/广东省林业科学研究院,广东广州510520

出　　处：《林业与环境科学》2022年第6期124-130,共7页Forestry and Environmental Science

基　　金：广东省林业科技创新项目(2016KJCX002/2019KJCX003);中央高校基本科研业务费专项资金资助(BFUKF202116)。

摘　　要：为选出速生和抗病性均好的无性系,以70个尾叶桉Eucalyptus urophylla无性系为试验材料,利用混合线性模型对尾叶桉6个月树高(H_(6))、18个月(后同)胸径(D18)、18个月时材积(V_(18))和18个月时抗病性指数(C_(18))性状进行遗传参数估算,同时通过基因型综合指数选择法对18个月时尾叶桉无性系进行早期选择。试验结果表明,尾叶桉无性系的早期生长快,H_(6)、D_(18)、V_(18)和C_(18)平均值分别为2.10m,5.03 cm、1.06 cm^(3)和0.66;尾叶桉H_(6)、D_(18)、V_(18)和C_(18)在无性系间达极显著水平(P<0.01),其无性系重复力介于0.76~0.90之间,单株重复力分别为0.18~0.58,表明遗传和环境因子均是影响尾叶桉生长的重要因素。生长性状间表型与加性相关均达到显著或极显著水平,达0.55以上;抗病指数与生长性状间表型相关不显著,而与C_(18)与D_(18)和V_(18)之间的遗传相关成显著水平(P<0.05),均为0.51。以18个月时生长与抗病性状进行早期选择,综合评选4个优良无性系ZQUC99、ZQUA15、LDUB96和ZQUA35,其生长指标和抗病指标均大于对照无性系。尾叶桉无性系间的生长性状差异显著,且具有较高的遗传稳定性。In order to select clones with fast growth and disease resistance,70 clones of Eucalyptus urophylla were used as materials,and the genetic parameters of the 6-month tree height (H6),18-month-old chest diameter (D_(18)),volume at 18 months (V_(18)) and disease resistance index (C_(18)) at 18 months were estimated by mixed linear model,and comprehensive index selection method was used for the early selection of 18-monthold clones of E.urophylla.The average values of H_(6),D_(18),V_(18)and C_(18)were 2.10 m,5.03 cm,1.06 cm^(3) and 0.66,respectively;The variance components of clones for H_(6),D_(18),V_(18)and C_(18)were extremely significant.The genetic variance components ranged from 0.05 to 0.68,and the environmental variance components ranged from 0.06 to 0.80.The clonal repeatability ranged from 0.76-0.90,and the individual repeatability ranged from 0.18-0.58,respectively.The results indicated that most traits of E.urophylla clones were affected by genetic factors as well as environmental factors.The phenotypic and genetic correlations between growth traits was significant,which were more than 0.55.There was no significant phenotypic correlation between growth traits and resistance traits,while a significant genetic correlation was observed between C_(18),D_(18),and V_(18),which both were 0.51.Four superior clones ZQUC99,ZQUA15,LDUB96,and ZQUA35 were comprehensively selected by early selection of growth and disease resistance traits at 18 months,and their growth indexes and disease resistance indexes were higher than those of the control clones.The growth traits of Eucalyptus urophylla clones were significantly different and had high genetic stability.

关 键 词：尾叶桉 抗病性 早期生长 遗传参数 

分 类 号：S792.99[农业科学—林木遗传育种]