@article {Zhang:2007p7990,
	title = {[Correlation between ITS genotype and geographical distribution of Pogostemon cablin]},
	journal = {Yao Xue Xue Bao},
	volume = {42},
	number = {1},
	year = {2007},
	month = {Jan},
	pages = {93{\textendash}7},
	abstract = {To investigate the correlation between genotype and distribution of Pogostemon cablin by sequencing ITS1 and ITS2 genes, and provide molecular information for its germplasm evaluation, ITS1 and ITS2 genes of Pogostemon cablin from different localities were identified by PCR direct sequencing. The sequences of ITS1 and ITS2 genes were 424 bp and 380 bp in length, respectively. And nineteen base substitutions were observed in ITS1 gene, and five in ITS2 gene. The results showed a good correlation between genotype and distribution of Pogostemon cablin, and ITS gene sequencing could provide useful molecular information for germplasm evaluation of the plant species verification.},
	keywords = {Base Sequence, Biodiversity, China, Cluster Analysis, DNA: Plant, DNA: Ribosomal, DNA: Ribosomal Spacer, Genotype, Geography, Lamiaceae, Molecular Sequence Data, Phylogeny, Plant Leaves, Plants: Medicinal, Sequence Analysis: DNA},
	author = {Ying Zhang and Yao Chen and Jin-Chao Zhang and Meng-Su Yang and Hui Cao and Pei-Gen Xiao}
}
@article {Whitfield:2004p8033,
	title = {Relationships between soil heavy metal concentration and mycorrhizal colonisation in Thymus polytrichus in northern England},
	journal = {Mycorrhiza},
	volume = {14},
	number = {1},
	year = {2004},
	month = {Feb},
	pages = {55{\textendash}62},
	abstract = {A study was conducted to establish whether the wild thyme [ Thymus polytrichus A. Kerner ex Borb{\'a}s ssp. britannicus (Ronn.) Kerguelen (Lamiaceae)] growing in the metal-contaminated soils along the River South Tyne, United Kingdom, is colonised by arbuscular mycorrhizal (AM) fungi, and whether the degree of colonisation increases (perhaps suggesting increasing mycorrhizal dependence) or decreases (indicating possible inhibition of AM growth) with increasing degree of soil contamination. Seasonal changes in AM colonisation were also assessed. The AM fungal communities colonising T. polytrichus were also investigated, using the polymerase chain reaction with restriction fragment length polymorphism and sequencing of fungal DNA to establish whether AM species richness varied between sites, and whether fungal ecotypes specific to sites with different amounts of metal contamination could be identified. All plants examined were heavily colonised by AM fungi, and mean percentage root length colonised did not increase significantly with increasing soil metal contamination. However, AM vesicle abundance (percentage of mycorrhizal root length containing vesicles) at the most contaminated site was significantly greater than at the other sites. No significant seasonal variation in degree of colonisation or vesicle abundance was found. Glomus was the predominant AM genus detected at all sites. The number of AM genotypes colonising T. polytrichus roots was similar at all sites but, although some were common to all sites, certain strains appeared to be specific to either the most- or the least-contaminated site. This variation in species may account for the difference in vesicle abundance between sites. The consistently heavy AM colonisation of T. polytrichus found suggests that these fungi are not inhibited by soil heavy metals at these sites, and that the host derives some benefit from its AM symbiont.},
	keywords = {Biodiversity, DNA: Fungal, England, Fungi, Metals: Heavy, Mycorrhizae, Phylogeny, Plant Roots, Polymerase Chain Reaction, Polymorphism: Restriction Fragment Length, Seasons, Soil, Soil Pollutants, Thymus Gland},
	doi = {10.1007/s00572-003-0268-z},
	author = {L Whitfield and A J Richards and D L Rimmer}
}
