Multi-site family trials and selection of superior families for Michelia chapensis
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摘要: 为了选育乐昌含笑Michelia chapensis优良家系,对2次乐昌含笑优树子代多点测定试验的6~7年生林分测定数据作统计分析。结果表明:生长性状、形质性状的家系间存在极显著差异(P<0.01),用材型和园林绿化型家系选择将是有效可行的。相关分析表明:生长性状间、大多数形质性状间、生长性状与大多数形质性状间的表型相关和遗传相关呈显著(P<0.05)或极显著正相关(P<0.01);生长及形质性状家系遗传力属于中等或中等偏上水平,其中形质性状的家系遗传力在不同试验批次间波动较大。生长性状的选择效果在不同入选率情况下遗传增益值差别很大,以材积增益最大;采用主成分分析法及Francis-Kannanbery模型分析法作用材型、园林绿化型优良家系选择,综合评选出用材型优良家系4个,材积增益为11.73%~29.84%,园林绿化型优良家系3个,其树干通直度较好,冠幅较大,园林绿化效果好。图2表7参15Abstract: To select superior families of Michelia chapensis, trials on two families were carried out. Random complete block (RBC) design was used with 17 treatments in 2005 and 21 in 2006 and 10 replications. Analyses included an ANOVA, a correlation analysis, and a principal component analysis. Results from the ANOVA indicated that for the two families growth traits and quality traits were highly significant (P = 0.01). The correlation analysis revealed a significant positive correlation (P = 0.05) among growth traits (r = 0.40-1.00), among most quality traits (r = 0.29-0.73), and between growth and quality traits (r = 0.27-0.84). For the two trials family heritability reached the medium level (h2=0.09-0.64 and 0.41-0.81). Also, differences in genetic gain were large with volume having the greatest genetic gain, (as high as 11.35% and 34.91% when selective ratio is 10%). The realized volume gains between 11.73% and 29.24%. Four superior families suitable for timber and three superior families suitable as ornamentals were selected. [Ch, 2 fig. 7 tab. 15 ref.]
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Key words:
- forest tree breeding /
- Michelia chapensis /
- superior tree /
- progeny test /
- family selection
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链接本文:
https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2015.05.016
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