Genetic variation in growth traits in a Quercus robur L. open-pollinated progeny test of the Slavonian provenance
Genetic variation in growth traits in a Quercus robur L. open-pollinated progeny test of the Slavonian provenance
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DOI：
10.1515/sg-2004-0036
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发表时间：
2004-01-01
期刊：
影响因子：
1
通讯作者：
Kajba, D
中科院分区：
文献类型：
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作者：
Bogdan, S;Katicic-Trupcevic, I;Kajba, D
该研究评估了来自克罗地亚（德拉瓦河谷中部）斯拉夫有梗橡树种源的21棵精选优树的自由授粉后代测试。试验于1992年用2年生幼苗进行。播种后5 ~ 13年测定树高，10 ~ 13年测定胸径，结果表明，种源内群体效应引起的变异不显著。家系效应引起的方差分量在树高和胸径上分别为11.1%~ 18.6%和2.2%~ 10.6%。家系效应引起的显著方差表明，生产性状的遗传变异主要集中在群体内，树高和胸径的家系平均狭义遗传力分别为0.62 ~ 0.78和0.28 ~ 0.65，个体遗传力分别为0.48 ~ 0.80和0.09 ~ 0.46，通过两种可能的选择方法对测量的性状计算了来自测试的实现增益和预期遗传增益：i）实现的增益，即选择的优树后代优于对照植物（来自种源内的桉树的散装物）ii）种源内的个体在与所研究的试验中代表的那些相同年龄的第一代优树的混合选择和iii）在自由授粉测试之后的第一代优树之间的向后选择。遗传增益估计表明，在自由授粉后代测定后，通过第一代优树的反向选择，可获得最高的遗传增益（比对照平均值高9.7至22.3%和6.8至17.3%）。这些结果表明，由于显著的群体内变异和高的加性方差，通过选择优树（特别是已建立的无性系种子果园）的种子和植株，至少在较年轻的年龄，可以改善所研究的橡树种群的生产性状。
The study presents evaluation of an open-pollinated progeny test of 21 selected plus trees from Slavonian pedunculate oak provenance in Croatia (in the central part of Drava river valley). The test was established in 1992 with two-year-old seedlings. Heights were measured at 5 to 13 years and diameters at breast height (DBH) at 10 to 13 years after sowing.Variances caused by the population within provenance effect were not significant during the studied period. In contrast, variance components caused by family effect were statistically significant, and ranged from 11.1 to 18.6 % and from 2.2 to 10.6 % for height and DBH respectively. Statistically significant variances caused by the family effect indicate that most of genetic variation of productive traits was within the studied populations.The estimated family mean narrow sense heritabilities varied from 0.62 to 0.78 and from 0.28 to 0.65, while individual heritabilities ranged from 0.48 to 0.80 and from 0.09 to 0.46 for height and DBH, respectively.Realised gain from the test and expected genetic gains by two possible methods of selection for the measured traits have been calculated for: i) realised gain i.e. superiority of selected plus trees progenies over control plants (bulks from unselected trees within the provenance) ii) individual within provenance mass selection of first generation plus trees at the same ages as those represented in studied trial and iii) backward selection among first generation plus trees after open-pollinated testing. Estimated genetic gains indicate that the highest gain could be expected by backward selection among first generation plus trees after open-pollinated progeny testing (9.7 to 22.3 % and 6.8 to 17.3 % over control means).These results indicate that due to significant within population variation and high additive variances, improvement for productive traits in the studied oak populations could be achieved by use of seeds and plants from selected plus trees (especially from already established clonal seed orchard), at least in younger ages.