Wood physical properties, color, decay resistance and stiffness in Tectona grandis clones with evidence of genetic control
Wood physical properties, color, decay resistance and stiffness in Tectona grandis clones with evidence of genetic control
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DOI：
10.1515/sg-2013-0019
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发表时间：
2013-01-01
期刊：
影响因子：
1
通讯作者：
Leandro, L.
中科院分区：
文献类型：
--
作者：
Moya, R.;Marin, J. D.;Leandro, L.
柚树种植园正在用包括克隆选择在内的遗传改良计划的树木来生产。然而，关于木材属性遗传的信息有限。为了研究巨松木材性质和茎粗的遗传参数，对两个10年生的试验进行了研究，这些试验包括名义上的2个地点×20个无性系×3个重复×1只公羊等。无性系变异有：心材(HWP)、髓(PP)和树皮(BP)百分比；绿色含水率(IMC)和密度(GD)；切向(TS)、径向(RS)和体积(VS)收缩以及切/径比(T/R)；L*a*b*颜色参数；以及硬度和比重(SG)。部分木材性状表现出较强的跨点遗传控制。较高的广义遗传力估计值(>0.36)是PP、IMC、SG、TS、VS和L*、a*和b*颜色坐标和硬度。边材和心材的HWP、BP、GD、RS、T/R比值和对杂色栓皮菌和血缘松毛虫的抗腐性估计较低和不显著。然而，HWP表现出显著的克隆x位点互作。表型和初步估计的遗传相关表明，选择生长较快的无性系将改善一些重要的木材性质，如增加HWP，降低PP和BP，而不影响其他木材性质。如预期的那样，为密度较高的木材选择无性系可以提高硬度，这应该会降低IMC，并对b*(黄/蓝)颜色产生负面影响。选择L*值较低的无性系可以提高木材的红度(a*)。
Tectona grandis (teak) plantations are being produced with trees from genetic improvement programs, including clonal selection. However, limited information about inheritance of wood properties is available. For studying genetic parameters of T. grandis wood properties and stem diameter two 10-yr-old trials were studied involving nominally 2 sites x 20 clones x 3 replicates x 1 ram et. Clonal variation was observed in: heartwood (HWP), pith (PP) and bark (BP) percentages; green moisture content (IMC) and density (GD); tangential (TS), radial (RS) and volumetric (VS) shrinkage and ratio tangential/radial: shrinkage (ratio T/R); L*a*b* color parameters; and stiffness and specify gravity (SG). Some wood properties evidenced strong across-sites genotypic control. The higher broad-sense heritability estimates (over 0.36) were for PP, IMC, SG, TS, VS and L*, a*, and b* color coordinates and stiffness. Low and non-significant values were estimated for HWP, BP, GD, RS, ratio T/R and decay resistance of sapwood and heartwood to Trametes versicolor and Pycnoporus sanguineus. However, HWP showed marked clone x site interaction. Phenotypic and tentatively estimated genotypic correlations indicate that selecting faster-growing clones will improve some important wood properties, such as increasing HWP, and decreasing PP and BP, without affecting other wood properties. Selecting clones for denser wood, as expected, improved stiffness, should decrease IMC and affect negatively b* (yellow/blue) color. Clone selection with lower L* values could increase redness (a*) of wood.