NDLI: Leaf morphological evidence of natural hybridization between two oak species (Quercus austrocochinchinensis and Q. kerrii) and its implications for conservation management

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Leaf morphological evidence of natural hybridization between two oak species (Quercus austrocochinchinensis and Q. kerrii) and its implications for conservation management

Content Provider	Springer Nature Link
Author	Song, Yigang Deng, Min Hipp, Andrew L. Li, Qiansheng
Copyright Year	2014
Abstract	Natural hybridization is known to be a potential threat to rare and endangered species due to the risk of extensive genetic swamping or assimilation. However, hybridization may also beneficial for rare species by increasing their genetic variation and adaptive potential. Quercus austrocochinchinensis is an endangered oak species that overlaps geographically with the common, widespread Q. kerrii. Morphological intermediates are common in contact zones between the species, suggesting interspecific hybridization. This phenomenon may lead to pure Q. austrocochinchinensis facing a larger threat. Given the importance of leaf morphology for hybrid identification in oaks, we characterized leaf morphological and anatomical features of pure populations of Q. kerrii and Q. austrocochinchinensis and a population of probable hybrids at the contact zone. The results demonstrate that (1) leaf morphological features of putative hybrids are stable and distinct from the parental taxa, and more similar to those of Q. kerrii; (2) anticlinal wall patterns of abaxial epidermal cells show the most significant differences between parental species and probable hybrids, providing an important character for species identification; and (3) putative hybrids were intermediate in leaf anatomical features between the two parental species. The leaf traits for identified Q. austrocochinchinensis, Q. kerrii and hybrids can be used to estimate the hybridization ratio at the contact zone. The morphological evidence, sympatry and phenology strongly suggest that the rare Q. austrocochinchinensis forms hybrids with the more widespread Q. kerrii. Natural hybridization might play an important future role in both migration and adaptation of the species to novel environments. Thus, the characters we identify here for diagnosing hybrids provide an important tool for conserving species and genetic diversity. We suggest that a management plan for Q. austrocochinchinensis should address the conservation of both of the pure species, investigation of gene flow dynamics in the hybrid zone and investigation of the impacts of gene flow on fitness of the two species.
Starting Page	139
Ending Page	151
Page Count	13
File Format	PDF
ISSN	16124669
Journal	Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch
Volume Number	134
Issue Number	1
e-ISSN	16124677
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-09-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Conservation Endangered species Hybrid zone Leaf epidermis Leaf morphological variation Forestry Plant Sciences Plant Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science Forestry

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