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What does a mixed population of Pinus sibirica and P. pumila from the southern Baikal region suggest about the structure of their hybrid zone?
European Journal of Forest Research ( IF 2.8 ) Pub Date : 2020-01-09 , DOI: 10.1007/s10342-019-01254-7
G. Vasilyeva , A. Bondar , S. Goroshkevich

Pinus sibirica and P. pumila have a vast hybrid zone, and its structure and maintenance model have not yet been considered. This study was carried out in the southern–western part of the hybrid zone. On the Khamar-Daban Ridge, there is a vigorous belt of mountain taiga forest, where the prevalent species is P. sibirica and where P. pumila produces a subalpine tree belt. The border between these belts is blurred, and a mixed zone of the species is formed, resulting in interspecies hybridization. Field observations, seed efficiency determination, and analysis of mt- and cpDNA markers were used to elucidate the pattern of this hybridization. Pinus sibirica and P. pumila hybridization was determined as bidirectional, and P. pumila was mainly the mother plant. Hybridization transforms to an introgression, and based on the life form, the studied hybrids were divided into two groups: intermediate and pumila-like cup-shaped forms. Both morphological types of hybrids had significantly fewer sound seeds per cone than the parental species. However, pumila-like hybrids had more sound seeds per cone compared to intermediate hybrids. We observed a positive correlation between hybrid seed efficiency and elevation. Summarizing the results of this study and those previously obtained enabled us to show different hybridization patterns in different parts of the hybrid zone, suggesting a mosaic model of hybrid zone maintenance.

中文翻译:

来自贝加尔湖南部地区的西伯利亚松和普米拉松的混合种群对它们杂交带的结构有何启示?

西伯利亚松和普米拉松具有广阔的杂交带,其结构和维护模式尚未考虑。这项研究是在混合区的南部-西部进行的。Khamar-Daban山脊上有茂密的山地针叶林带,盛产种是西伯利亚P. pumila,产亚高山林带。这些带之间的边界模糊,形成物种的混合带,导致种间杂交。田间观察、种子效率测定以及 mt-和 cpDNA 标记的分析被用来阐明这种杂交的模式。确定西伯利亚松与普米拉的杂交为双向,以普米拉为主的母株。杂交转化为基因渗入,并基于生命形式,研究的杂种被分为两组:中间和类似pumila的杯形形式。与亲本物种相比,两种形态类型的杂种每个锥体的健全种子显着减少。然而,与中间杂交种相比,类似 pumila 的杂交种在每个锥体中具有更多的健全种子。我们观察到杂交种子效率和海拔之间呈正相关。总结这项研究的结果和先前获得的结果,我们能够在混合区的不同部分显示不同的杂交模式,表明混合区维护的镶嵌模型。与中间杂交种相比,类似 pumila 的杂交种在每个锥体中具有更多的健全种子。我们观察到杂交种子效率和海拔之间呈正相关。总结这项研究的结果和先前获得的结果,我们能够在混合区的不同部分显示不同的杂交模式,表明混合区维护的镶嵌模型。与中间杂交种相比,类似 pumila 的杂交种在每个锥体中具有更多的健全种子。我们观察到杂交种子效率和海拔之间呈正相关。总结这项研究的结果和先前获得的结果,我们能够在混合区的不同部分显示不同的杂交模式,表明混合区维护的镶嵌模型。
更新日期:2020-01-09
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