The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform
Klaas Vrieling - One of the best experts on this subject based on the ideXlab platform.
-
Natural Hybridization between senecio jacobaea and senecio aquaticus molecular and chemical evidence
Molecular Ecology, 2004Co-Authors: Heather Kirk, Mirka Macel, Peter G L Klinkhamer, Klaas VrielingAbstract:Hybridization is known to be involved in a number of evolutionary processes, including species formation, and the generation of novel defence characteristics in plants. The genus Senecio of the Asteraceae family is highly speciose and has historically demonstrated significant levels of interspecific Hybridization. The evolution of novel chemical defence characteristics may have contributed to the success of Senecio hybrids. Chemical defence against pathogens and herbivores has been studied extensively in the model species Senecio jacobaea , which is thought to hybridize in nature with Senecio aquaticus . Here, we use amplified fragment length polymorphisms (AFLPs) and pyrrolizidine alkaloid (PA) composition to confirm that Natural Hybridization occurs between S. jacobaea and the closely related species S. aquaticus . AFLPs are also used to estimate the ancestry of hybrids. We also demonstrate that even highly back-crossed hybrids can possess a unique mixture of defence chemicals specific to each of the parental species. This hybrid system may therefore prove to be useful in further studies of the role of Hybridization in the evolution of plant defence and resistance.
Heather Kirk - One of the best experts on this subject based on the ideXlab platform.
-
Natural Hybridization between senecio jacobaea and senecio aquaticus molecular and chemical evidence
Molecular Ecology, 2004Co-Authors: Heather Kirk, Mirka Macel, Peter G L Klinkhamer, Klaas VrielingAbstract:Hybridization is known to be involved in a number of evolutionary processes, including species formation, and the generation of novel defence characteristics in plants. The genus Senecio of the Asteraceae family is highly speciose and has historically demonstrated significant levels of interspecific Hybridization. The evolution of novel chemical defence characteristics may have contributed to the success of Senecio hybrids. Chemical defence against pathogens and herbivores has been studied extensively in the model species Senecio jacobaea , which is thought to hybridize in nature with Senecio aquaticus . Here, we use amplified fragment length polymorphisms (AFLPs) and pyrrolizidine alkaloid (PA) composition to confirm that Natural Hybridization occurs between S. jacobaea and the closely related species S. aquaticus . AFLPs are also used to estimate the ancestry of hybrids. We also demonstrate that even highly back-crossed hybrids can possess a unique mixture of defence chemicals specific to each of the parental species. This hybrid system may therefore prove to be useful in further studies of the role of Hybridization in the evolution of plant defence and resistance.
Mirka Macel - One of the best experts on this subject based on the ideXlab platform.
-
Natural Hybridization between senecio jacobaea and senecio aquaticus molecular and chemical evidence
Molecular Ecology, 2004Co-Authors: Heather Kirk, Mirka Macel, Peter G L Klinkhamer, Klaas VrielingAbstract:Hybridization is known to be involved in a number of evolutionary processes, including species formation, and the generation of novel defence characteristics in plants. The genus Senecio of the Asteraceae family is highly speciose and has historically demonstrated significant levels of interspecific Hybridization. The evolution of novel chemical defence characteristics may have contributed to the success of Senecio hybrids. Chemical defence against pathogens and herbivores has been studied extensively in the model species Senecio jacobaea , which is thought to hybridize in nature with Senecio aquaticus . Here, we use amplified fragment length polymorphisms (AFLPs) and pyrrolizidine alkaloid (PA) composition to confirm that Natural Hybridization occurs between S. jacobaea and the closely related species S. aquaticus . AFLPs are also used to estimate the ancestry of hybrids. We also demonstrate that even highly back-crossed hybrids can possess a unique mixture of defence chemicals specific to each of the parental species. This hybrid system may therefore prove to be useful in further studies of the role of Hybridization in the evolution of plant defence and resistance.
Peter G L Klinkhamer - One of the best experts on this subject based on the ideXlab platform.
-
Natural Hybridization between senecio jacobaea and senecio aquaticus molecular and chemical evidence
Molecular Ecology, 2004Co-Authors: Heather Kirk, Mirka Macel, Peter G L Klinkhamer, Klaas VrielingAbstract:Hybridization is known to be involved in a number of evolutionary processes, including species formation, and the generation of novel defence characteristics in plants. The genus Senecio of the Asteraceae family is highly speciose and has historically demonstrated significant levels of interspecific Hybridization. The evolution of novel chemical defence characteristics may have contributed to the success of Senecio hybrids. Chemical defence against pathogens and herbivores has been studied extensively in the model species Senecio jacobaea , which is thought to hybridize in nature with Senecio aquaticus . Here, we use amplified fragment length polymorphisms (AFLPs) and pyrrolizidine alkaloid (PA) composition to confirm that Natural Hybridization occurs between S. jacobaea and the closely related species S. aquaticus . AFLPs are also used to estimate the ancestry of hybrids. We also demonstrate that even highly back-crossed hybrids can possess a unique mixture of defence chemicals specific to each of the parental species. This hybrid system may therefore prove to be useful in further studies of the role of Hybridization in the evolution of plant defence and resistance.
Richard I Milne - One of the best experts on this subject based on the ideXlab platform.
-
asymmetrical Natural Hybridization varies among hybrid swarms between two diploid rhododendron species
Annals of Botany, 2017Co-Authors: Kevin S Burgess, Richard I Milne, Chaonan Fu, Dezhu LiAbstract:Background and Aims The extent to which Hybridization leads to gene flow between plant species depends on the structure of hybrid populations. However, if this varies between locations, species barriers might prove permeable in some locations but not in others. To assess possible variation in hybrid population structure, the magnitude and direction of Natural Hybridization between two Chinese endemic species, Rhododendron spiciferum and Rhododendron spinuliferum, were evaluated. Methods Thirteen nuclear microsatellite markers were employed to characterize 566 individuals collected from 15 non-allopatric populations and nine allopatric parental populations. Chloroplast DNA (cpDNA) sequences were obtained from a subset of samples. Genetic structure and direction of gene flow was determined using a combination of STRUCTURE and NEWHYBRIDS analysis. Key Results Nuclear analysis revealed that parental taxa formed two genetically distinct clusters and hybrids shared the genetic background of both parents and did not form a separate genetic lineage. Overall, hybrid swarms were dominated by early- and later-generation hybrids, with a significantly higher proportion of hybrids (59·6 %) possessing >50 % R. spiciferum-like nuclear germplasm. The cpDNA analysis further indicated that a significantly greater proportion of hybrids (61·1 %) possessed the R. spiciferum cpDNA haplotype. Conclusions Gene flow between R. spiciferum and R. spinuliferum was found to be bidirectional in 14 of the 15 hybrid swarms and asymmetrical in six hybrid swarms. Asymmetrical gene flow was evident for only nuclear DNA (nDNA) in two populations, for only cpDNA in three populations, and for both nDNA and cpDNA in one population. Collectively, the variation in genetic structure found among the 15 hybrid swarms suggests that introgression rather than hybrid speciation is a more likely outcome of Hybridization between these hybridizing taxa.
-
morphological and molecular evidence of Natural Hybridization between two distantly related rhododendron species from the sino himalaya
Botanical Journal of the Linnean Society, 2008Co-Authors: Richard I MilneAbstract:Rhododendron (Ericaceae) is a large woody genus in which Hybridization may play an important role in evolution and speciation, particularly in the Sino-Himalayan region, where many interfertile species often occur sympatrically. Natural Hybridization between Rhododendron delavayi Franch. (= R. arboreum ssp. delavayi) and Rhododendron decorum Franch., which belong to different subsections of subgenus Hymenanthes, was investigated. Material of R. delavayi and R. decorum and their putative hybrids was collected from the wild. On the basis of morphology, chloroplast DNA, nuclear ribosomal DNA, and AFLP profiles, hybrids and parental species were identified. Hybridization occurred in both directions, but was asymmetrical, with R. delavayi as the major maternal parent in the hybrid zone. Most of the hybrids possessed intermediate phenotypes, and amongst the 15 hybrids detected were six F1s, two F2s, one first-generation backcross to R. delavayi, and two first-generation backcrosses to R. decorum. This indicates that, if Rhododendron underwent rapid radiation in this region, it did so in spite of permeable species barriers. (c) 2008 The Linnean Society of London.
