| 马尾松无性系木材基本密度和纤维形态的变异及选择 |
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| 引用本文： | 尹焕焕,刘青华,周志春,万雪琴,余启新,丰忠平.马尾松无性系木材基本密度和纤维形态的变异及选择[J].浙江农林大学学报,2020,37(6):1186-1192. |
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| 作者姓名： | 尹焕焕 刘青华 周志春 万雪琴 余启新 丰忠平 |
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| 作者单位： | 1.四川农业大学 林学院，四川 成都 6100002.中国林业科学研究院 亚热带林业研究所，国家林业和草原局 马尾松工程技术研究中心/浙江省林木育种技术研究重点实验室，浙江 杭州 3114003.浙江省淳安县姥山林场，浙江 淳安 311700 |
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| 基金项目： | “十三五”国家重点研发计划项目(2017YFD0600300)；“十三五”浙江省林木新品种选育重大专项(2016C02056-4)；浙江省重点研发计划项目(2020C02007) |
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| 摘 要： | 目的 研究马尾松Pinus massoniana在产地间和产地内的无性系木材基本密度和纤维形态的遗传变异规律，为马尾松良种选育和改良提供优质的遗传材料。 方法 从浙江省淳安县姥山林场34年生马尾松无性系试验林中，选出5个不同产地的50个无性系为研究对象，测定其木材基本密度、纤维长度、纤维宽度和纤维长宽比。通过方差分析、相关性分析及遗传参数估算揭示其遗传变异规律，并采用独立选择标准法对50个无性系进行选优。 结果 方差分析结果表明:木材基本密度、纤维形态在产地间和产地内的无性系间皆存在显著(P＜0.01)或极显著(P＜0.001)差异。其中，木材基本密度、纤维长度和纤维长宽比变异主要来源于产地内无性系间，占总变异的19.37%~28.26%；纤维宽度的遗传变异主要来自于产地间变异，占总变异的45.57%。木材基本密度与纤维长度、纤维长宽比存在极显著(P＜0.001)的表型和遗传负相关，与纤维宽度相关不显著(P＞0.05)。纤维形态指标在幼龄—成熟期呈极显著(P＜0.001)的遗传正相关，而木材基本密度在幼龄—成熟期的相关不显著(P＞0.05)。共选出12个材性优良的马尾松无性系。 结论 马尾松木材基本密度、纤维长度、纤维长宽比3个性状在改良过程中应注重产地内优树的选择。而纤维宽度通过产地间选择能达到较好的改良效果。鉴于纤维形态在幼龄—成熟期相关性极显著，可作为材性早期选择指标。表4参25
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| 关 键 词： | 马尾松 产地 无性系 木材基本密度 纤维形态 幼龄材 成熟材 遗传变异 |
| 收稿时间： | 2019-12-12 |
Genetic variation of wood basic density and fiber morphology and selection of Pinus massoniana |
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| YIN Huanhuan,LIU Qinghua,ZHOU Zhichun,WAN Xueqin,YU Qixin,FENG Zhongping.Genetic variation of wood basic density and fiber morphology and selection of Pinus massoniana[J].Journal of Zhejiang A&F University,2020,37(6):1186-1192. |
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| Authors: | YIN Huanhuan LIU Qinghua ZHOU Zhichun WAN Xueqin YU Qixin FENG Zhongping |
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| Institution: | 1.College of Forestry, Sichuan Agricultural University, Chengdu 610000, Sichuan, China2.Zhejiang Provincial Key Laboratory of Tree Breeding, Research Center of Masson Pine, State Forestry and Grassland Administration Engineering, Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Hangzhou 311400, Zhejiang, China3.Laoshan Forest Farm of Chun’an County of Zhejiang Province, Chun’an 311700, Zhejiang, China |
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| Abstract: | Objective With an analysis of the genetic variation of wood basic density and fiber morphology of Pinus massoniana among seed sources and clones within seed sources, this paper is aimed to provide high quality genetic material for the breeding and improvement of P. massoniana. Method Fifty clones from five seed sources of P. massoniana clones selected from 34-year-old experimental forests of different seed sources in Laoshan Forest Farm, Chun’an County, Zhejiang Province, were investigated to determine the wood basic density, fiber length, fiber width and fiber length-width ratio. Then variance analysis, correlation analysis and genetic parameter estimation were conducted to reveal the genetic variation while superior individuals were selected from the 50 P. massoniana with the employment of Independent Selection Standard Method. Result The results of ANOVA revealed that there were significant or extremely significant differences in the basic density and fiber morphology of the wood among seed sources and clones within seed sources. The variation of clones within seed sources with the variance components ranging from 19.37% to 28.26% was the main source of wood basic density, fiber length and fiber length-width ratio. The variation of seed sources with the variance components (45.57%) was the main source of fiber width. There is a significant phenotypic and genetic negative correlation between basic densities of wood and fiber length and fiber length/width, but the correlation coefficient is not high and the basic densities of wood is not related to fiber width. The fiber morphological indexes showed significant positive genetic correlation in the juvenile age and mature age, while the wood basic density showed no significant correlation in the juvenile age and mature age. A total of 12 clones of P. massoniana with excellent wood properties were selected. Conclusion More attention should be paid to the selection of superior trees within seed sources in the attempt to improve the three traits of wood basic density, fiber length and fiber length-width ratio. On the other hand, the fiber width can be better improved through the choice of seed sources. In view of the significant correlation of fiber morphology indexes between juvenile and mature timber, they can be selected as reference indexes in the early stage. Ch, 4 tab. 25 ref.] |
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