Fine-scale spatial genetic structure in a predominantly selfing plant: role of seed and pollen dispersal.

Abstract:

:We present a study of fine-scale spatial genetic structure (SGS) and assess the impact of seed and pollen dispersal on the pattern of genetic diversity in the predominantly selfing Hordeum spontaneum. The study included (1) direct measurement of dispersal in a controlled environment, and (2) analyses of SGS and estimation of the ratio of pollen to seed flow in three natural populations sampled in linear transects at fixed increasing inter-plant distances. Analysis of SGS with 10 nuclear SSRs showed in all three populations a significant autocorrelation for the distance classes of 1 or 2 m and a negative linear relationship between kinship coefficients, calculated for pairs of individuals, and logarithm of geographical distance between members of the pairs. Major seed dispersal (95%) was found to be within 1.2 m from the mother plant. Pollen flow, estimated from the comparison of nuclear and chloroplast variation, was spatially limited as much as was seed dispersal, and tended to be overestimated when measured at spatial scales exceeding that of SGS. We conclude that combined effects of selfing, occasional outcrossing, localized seed dispersal and high plant density create an equilibrium between drift and gene flow in this species resulting in SGS at a very fine spatial scale.

journal_name

Heredity (Edinb)

journal_title

Heredity

authors

Volis S,Zaretsky M,Shulgina I

doi

10.1038/hdy.2009.168

subject

Has Abstract

pub_date

2010-10-01 00:00:00

pages

384-93

issue

4

eissn

0018-067X

issn

1365-2540

pii

hdy2009168

journal_volume

105

pub_type

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