Genetic origin and composition of a natural hybrid poplar Populus × jrtyschensis from two distantly related species

Jiang, Dechun; Feng, Jiexiong; Dong, Miao; Wu, Guangxin; Mao, Kangshan; Liu, Jianquan

doi:10.1186/s12870-016-0776-6

Cited by 27 publications

(25 citation statements)

References 63 publications

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“…It is clear from other comparisons of traits and genomic architecture among parental species and hybrids across the genus Populus , that nuclear and chloroplast variation play a large role in determining hybrid performance (Christe et al, ; Dillen, Marron, Koch, & Ceulemans, ; Gompert, Mandeville, & Buerkle, ; Jiang et al, ; Lexer et al, ; Taylor, Larson, & Harrison, ) As sister species and the only native North American aspens in the section Populus ( Leuce ), P. grandidentata and P. tremuloides may have differentiated along drought/cold niche axes. Following the last ice age, P. tremuloides may have been preadapted to dry/cold conditions, so its range has expanded as it has followed glaciers.…”

Section: Discussionmentioning

confidence: 99%

Drought and freezing vulnerability of the isolated hybrid aspen Populus x smithii relative to its parental species, P. tremuloides and P. grandidentata

Deacon

Grossman

Cavender‐Bares

2019

Ecology and Evolution

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Aim We assessed the vulnerability of an isolated, relictual Pleistocene hybrid aspen population of conservation interest ( Populus x. smithii ) and the nearest populations of its parent species ( Populus grandidentata and Populus tremuloides ) to springtime post‐bud break freezing and growing season drought stress. Response to these stressors in the three taxa was compared in terms of avoidance and tolerance. Location North American Midwest; USA. Methods Unique genets from the hybrid Niobrara River population and from the two parental populations were propagated in a common garden from rhizome cuttings. We tracked their phenology before and after bud break and measured their vulnerability to freezing (stem electrolyte leakage and leaf chlorophyll fluorescence) and to drought (stem hydraulic conductance, leaf osmotic potential, stomatal pore index, and gas exchange). Results Populus grandidentata was slower to leaf out, showed lower vulnerability to stem freezing and drought‐induced cavitation, but exhibited a lower capacity to tolerate drought stress through leaf resistance traits compared to P. tremuloides . Hybrids were similar to P. grandidentata in their overwintering strategy, exhibiting later bud break, and in their higher resistance to stem freezing damage, but they were more similar to P. tremuloides in their higher vulnerability to drought‐induced cavitation. The hybrids shared various leaf‐level gas exchange traits with both parents. All aspens showed limited loss of leaf photosynthetic function following moderate freezing. Main Conclusions The Niobrara River hybrid population is vulnerable to drought due to its combination of inherited drought avoidance and tolerance traits. As climate changes, P. x smithii will likely suffer from increased drought stress, while being unaffected by frost during warmer springs. The two parental species contrast in their survival mechanisms in response to climatic stress, with P. tremuloides tending toward freezing tolerance but drought avoidance and P. grandidentata tending toward freezing avoidance and drought tolerance.

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Section: Discussionmentioning

confidence: 99%

Drought and freezing vulnerability of the isolated hybrid aspen Populus x smithii relative to its parental species, P. tremuloides and P. grandidentata

Deacon

Grossman

Cavender‐Bares

2019

Ecology and Evolution

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“…It assumes parental genotypes are most fit in their respective habitats, but hybrids would be more fit in intermediate habitats that represent an ecological transition between parental adaptive norms [40,41]. In contrast, the mosaic model implies that suitable habitat is patchy in space, with each parent locally adapted to particular patches and hybrid offspring occurring at the intersect of suitable parental patches, resulting in a mosaic pattern on the landscape [42][43][44]. The mosaic model integrates both environmental and non-environmental selection in the maintenance of the hybrid zone.…”

Section: Models Of Hybrid Zone Maintenancementioning

confidence: 99%

Mixing It Up: The Role of Hybridization in Forest Management and Conservation under Climate Change

Janes

Hamilton

2017

Forests

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Forest tree hybrid zones provide a wealth of novel genetic variation that can be harnessed to safeguard populations in changing climates. In the past 30 years, natural and artificial forest hybrid zones have facilitated significant contributions to selective breeding programs, conservation, and our understanding of the evolutionary processes and mechanisms that influence the maintenance of species and community interactions. This review highlights advances in these areas using forest hybrid zones. Taking examples from well-known genera, including eucalypt, poplar, oak and spruce, this review details the important role hybrid zones play in managing conservation of genetic variation, the environmental and non-environmental factors that influence barriers to reproduction, and the impact that genetic ancestry may have on community biodiversity. Given increasing concern surrounding species adaptability under rapidly changing conditions, we describe how the study of forest hybrid zones, using quantitative and genomic approaches, can facilitate conservation of genetic diversity and long-term species management.

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“…However, the phenotypic structure of P. × jrtyschensis populations is determined by extremely strong natural selection, resulting in the prevalence of F 1 hybrids, and rejection of next-generation hybrids and backcrosses early in ontogenesis before reproductive maturity (Jiang et al, 2016;Proshkin, Klimov, 2017а). All these lead to drastic decrease in inter-population variability.…”

Section: Discussionmentioning

confidence: 99%

Phenetic Analysis of Populus Nigra, P. Laurifolia and P. × Jrtyschensis in Natural Hybridization Zone

Klimov¹

2018

Vestn. VOGiS

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The wide spread of hybridization in the genus Populus, including spontaneous hybridization, caused by cultivars, requires studying the variability and inheritance of morphological traits by hybrids for initial tracking of these processes. The analysis of endogenous, intra- and inter-population variability was performed on 533 individual poplar trees in seven populations of P. nigra, seven populations of P. laurifolia and four populations of P. × jrtyschensis in the Tom river basin. On each specimen, 15 leaves from short mid-crown branches were collected to determine the shape of the leaf blade, the shape of its tip and base, as well as the branch morphotype. Some biometric indicators were proposed for geometric assessment of the leaf blade shapes of poplar species. The analysis showed that of all the traits examined only the leaf blade shape did not meet the criterion for “phene”, since it is usually represented by several forms in the crown of one and the same tree. In all the species studied, the level of their intra-population diversity was found to be much higher than the inter-population one. According to the increase of intra-population variability of qualitative traits, the taxa could be ranked as P. nigra < P. laurifolia < P. × jrtyschensis. The share of inter-population diversity differed among the species studied, accounting for 21.5% in P. laurifolia, 13.8% in P. nigra and 8.0% in P. × jrtyschensis. The P. laurifolia populations showed the greatest inter-population differentiation, most likely because of a disjunct distribution due to narrow specialization to the montane river environment. The lower differentiation in P. nigra is probably due to the facts that this species dominates the poplar stands of the Tom River basin; its populations are not fragmented and are linked by vast gene flow. In P. nigra, an increase in the diversity of qualitative characteristics and phenotypes was observed in populations confined to hybridization centers. Natural selection is most likely the factor governing the inter-population differentiation in P. × jrtyschensis, leading to the predominance of F1 hybrids in populations and hence to a sharp decrease in inter-population variability.

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Genetic origin and composition of a natural hybrid poplar Populus × jrtyschensis from two distantly related species

Cited by 27 publications

References 63 publications

Drought and freezing vulnerability of the isolated hybrid aspen Populus x smithii relative to its parental species, P. tremuloides and P. grandidentata

Drought and freezing vulnerability of the isolated hybrid aspen Populus x smithii relative to its parental species, P. tremuloides and P. grandidentata

Mixing It Up: The Role of Hybridization in Forest Management and Conservation under Climate Change

Phenetic Analysis of Populus Nigra, P. Laurifolia and P. × Jrtyschensis in Natural Hybridization Zone

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