• Key message

In this study, genetic variation in polycyclic growth was investigated in a young Pinus brutia Ten. study in Turkey. The number of flushes was partially under additive genetic control and was moderately correlated with the tree height at age 4.

• Context

Pinus brutia is the most economically important tree species in Turkey. Previous limited studies suggested that its cyclic shoot elongation pattern can be useful for selecting seed sources for breeding and conservation of genetic resources.

• Aims

Understand the degree of genetic control of terminal shoot growth, number of flushes, and total tree height at early ages and assess the genetic relationships between the traits to guide decisions for breeding and gene conservation.

• Methods

Open-pollinated progenies of 188 trees from eight different seed sources were tested in three locations in the Aegean region of Turkey. Variance components, heritability and additive genetic correlations were estimated for tree height, terminal shoot length, and number of flushes.

• Results

Traits were moderately under genetic control at the family. Terminal shoot length explained 76% of the variation in tree height. A strong genetic correlation (0.96) was found between tree height and terminal shoot length, while the number of flushes had a moderate genetic correlation with height (0.59). Northern seed sources tended to display less height growth, partially due to fewer flushes and lower shoot length.

• Conclusion

Shoot elongation in the species is partially under additive genetic control and could be useful to select for early height in breeding programs.

中文翻译：

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终生枝长，潮红数和高度之间的遗传关系在一个4岁的松树10子代测试中。

•关键信息

在这项研究中，调查了年轻的 布鲁斯松树 十号中多环生长的遗传变异。在土耳其学习。潮红的数量部分受累加遗传控制，并与4岁时的树高适度相关。

•上下文

松树松是土耳其最重要的经济树种。先前的有限研究表明，其周期性芽伸长模式可用于选择种子来源进行遗传资源的育种和保存。

•目的

了解早期幼芽生长的遗传控制程度，潮红数和幼年总树高，并评估性状之间的遗传关系，以指导育种和基因保存的决策。

•方法

在土耳其爱琴海地区的三个位置测试了来自八种不同种子来源的188棵树的开放授粉后代。估计了树高，末端芽长和潮红数的方差成分，遗传力和加性遗传相关性。

•结果

在家庭中，性状处于遗传控制之下。末梢的长度解释了树高变化的76％。在树的高度和末端梢的长度之间发现了很强的遗传相关性（0.96），而潮红的数量与树高之间有中等的遗传相关性（0.59）。北部种子源倾向于表现出较低的高度增长，部分原因是较少的潮红和较短的芽长。

•结论

该物种的枝条伸长部分受累加遗传控制，可能有助于选择育种程序中的早期高度。