TY - JOUR
T1 - Fine-Scale Spatial Genetic Structure in Emmer Wheat and the Role of Population Range Position
AU - Volis, Sergei
AU - Song, Minshu
AU - Zhang, Yong Hong
AU - Shulgina, Irina
N1 - Funding Information:
Acknowledgments The current study was funded by Israel Academy of Sciences (ISF 958/07). We would like to thank Asher Dvir for help with sampling and Mitia Frumin, Keren Lev, Yoav Sofer and Michael Blecher for help with GIS data, and Linda Whittaker for editing the manuscript English.
PY - 2014/3/1
Y1 - 2014/3/1
N2 - The extent of spatial genetic structure (SGS) within plant populations depends on seed and pollen dispersal distance, breeding type, level of self-fertilization and effective plant density. Self-fertilizing species with gravity-dispersed seeds are expected to have both small effective population sizes and low pollen movement leading to high genetic structure. Higher SGS can be expected in more patchy and peripheral populations because of lower plant density and population sizes, and lower intensity of gene flow. We tested these predictions analyzing SGS in two core and two peripheral populations of predominantly self-fertilizing emmer wheat. Analysis of SGS with 11 nuclear microsatellites revealed (1) a negative linear relationship between kinship coefficients, calculated for pairs of individuals, and the logarithm of geographical distance between members of the pairs, in all studied populations; and (2) a significant autocorrelation for a distance up to 5 m (core populations) or 20 m (peripheral populations). Pollen flow, estimated from comparison of nuclear and chloroplast variation, was spatially limited, as was seed dispersal. Our results support a hypothesized relationship between SGS intensity and breeding system, the mode of seed dispersal and the population range position (core vs. periphery).
AB - The extent of spatial genetic structure (SGS) within plant populations depends on seed and pollen dispersal distance, breeding type, level of self-fertilization and effective plant density. Self-fertilizing species with gravity-dispersed seeds are expected to have both small effective population sizes and low pollen movement leading to high genetic structure. Higher SGS can be expected in more patchy and peripheral populations because of lower plant density and population sizes, and lower intensity of gene flow. We tested these predictions analyzing SGS in two core and two peripheral populations of predominantly self-fertilizing emmer wheat. Analysis of SGS with 11 nuclear microsatellites revealed (1) a negative linear relationship between kinship coefficients, calculated for pairs of individuals, and the logarithm of geographical distance between members of the pairs, in all studied populations; and (2) a significant autocorrelation for a distance up to 5 m (core populations) or 20 m (peripheral populations). Pollen flow, estimated from comparison of nuclear and chloroplast variation, was spatially limited, as was seed dispersal. Our results support a hypothesized relationship between SGS intensity and breeding system, the mode of seed dispersal and the population range position (core vs. periphery).
KW - Gene flow
KW - Neighborhood size
KW - Pollen flow
KW - Sp statistics
KW - Spatial autocorrelation
UR - http://www.scopus.com/inward/record.url?scp=84894365564&partnerID=8YFLogxK
U2 - 10.1007/s11692-013-9256-1
DO - 10.1007/s11692-013-9256-1
M3 - Article
AN - SCOPUS:84894365564
SN - 0071-3260
VL - 41
SP - 166
EP - 173
JO - Evolutionary Biology
JF - Evolutionary Biology
IS - 1
ER -