Rapid differentiation of experimental populations of wheat for heading time in response to local climatic conditions.

Abstract:

BACKGROUND AND AIMS:Dynamic management (DM) of genetic resources aims at maintaining genetic variability between different populations evolving under natural selection in contrasting environments. In 1984, this strategy was applied in a pilot experiment on wheat (Triticum aestivum). Spatio-temporal evolution of earliness and its components (partial vernalization sensitivity, daylength sensitivity and earliness per se that determines flowering time independently of environmental stimuli) was investigated in this multisite and long-term experiment. METHODS:Heading time of six populations from the tenth generation was evaluated under different vernalization and photoperiodic conditions. KEY RESULTS:Although temporal evolution during ten generations was not significant, populations of generation 10 were genetically differentiated according to a north-south latitudinal trend for two components out of three: partial vernalization sensitivity and narrow-sense earliness. CONCLUSIONS:It is concluded that local climatic conditions greatly influenced the evolution of population earliness, thus being a major factor of differentiation in the DM system. Accordingly, a substantial proportion (approximately 25 %) of genetic variance was distributed among populations, suggesting that diversity was on average conserved during evolution but was differently distributed by natural selection (and possibly drift). Earliness is a complex trait and each genetic factor is controlled by multiple homeoalleles; the next step will be to look for spatial divergence in allele frequencies.

journal_name

Ann Bot

journal_title

Annals of botany

authors

Goldringer I,Prouin C,Rousset M,Galic N,Bonnin I

doi

10.1093/aob/mcl160

subject

Has Abstract

pub_date

2006-10-01 00:00:00

pages

805-17

issue

4

eissn

0305-7364

issn

1095-8290

pii

mcl160

journal_volume

98

pub_type

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