湿地松家系产脂力、树脂密度和松节油含量的测定与遗传分析
Determination and genetic analysis of resin productivity, resin density and turpentine content in halfsib families of slash pine
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摘要: 为了精确测定湿地松产脂力、树脂密度和松节油含量，研究其遗传变异规律，选择产脂性状优良的湿地松遗传材料，利用一套改良的松脂测试收集器和水蒸气蒸馏装置，对49个湿地松自由授粉家系进行了测定分析。结果表明：方差分析显示湿地松产脂力、胸径和松脂基本密度的家系效应均极显著(P0.01)，家系遗传力分别为0.798、0.436、0.337，单株遗传力分别为0.685、0.368、0.295，分别处于较高水平；相关分析表明，产脂力与松脂基本密度之间极显著正相关（r=0.540, P0.01)，而松脂中松节油含量与松脂基本密度呈极显著负相关（r=-0.838, P0.01)；松脂中松节油含量是评价松脂质量的一个重要指标，通过产脂力与松节油含量的乘积即松节油产量指数估算各个参试家系松节油含量指标的选择差、现实增益和遗传增益，筛选出显著优于对照的4个优良家系。Abstract: To accurately measure the variation of resin productivity, resin density and turpentine content from 49 openpollinated families of slash pine (Pinus elliottii), an improved resin collection and distillation method and device was used for the data collection. Genetic analysis of the halfsib family data showed highly significant differences in resin productivity, DBH (diameter at breast height) and resin basic density among the families (P0.01); the estimated family heritability for resin productivity, DBH and resin basic density was 0.798, 0.436 and 0.337, respectively, with corresponding estimated individual heritability 0.685, 0.368 and 0.295. There was a significant positive genetic correlation (r=0.540, P0.01) between resin productivity and resin basic density, while a significant negative genetic correlation (r=-0.838, P0.01) between turpentine content and resin basic density. The turpentine content is an important resin quality indicator. Resin productivity multiplied by turpentine content percentage, which was designated as turpentine production index, was used to estimate the genetic gain for selection and four superior families with higher turpentine production index were selected.
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