NDLI: Contrasting evolutionary forces in the Arabidopsis thaliana floral developmental pathway.

Content Provider	PubMed Central
Author	Olsen, Kenneth M. Womack, Andrew Garrett, Ashley R. Purugganan, Michael D. Suddith, Jane I.
Abstract	The floral developmental pathway in Arabidopsis thaliana is composed of several interacting regulatory genes, including the inflorescence architecture gene TERMINAL FLOWER1 (TFL1), the floral meristem identity genes LEAFY (LFY), APETALA1 (AP1), and CAULIFLOWER (CAL), and the floral organ identity genes APETALA3 (AP3) and PISTILLATA (PI). Molecular population genetic analyses of these different genes indicate that the coding regions of AP3 and PI, as well as AP1 and CAL, share similar levels and patterns of nucleotide diversity. In contrast, the coding regions of TFL1 and LFY display a significant reduction in nucleotide variation, suggesting that these sequences have been subjected to a recent adaptive sweep. Moreover, the promoter of TFL1, unlike its coding region, displays high levels of diversity organized into two distinct haplogroups that appear to be maintained by selection. These results suggest that patterns of molecular evolution differ among regulatory genes in this developmental pathway, with the earlier acting genes exhibiting evidence of adaptive evolution.
Starting Page	1641
File Format	PDF
ISSN	00166731
Journal	Genetics
Issue Number	4
Volume Number	160
Language	English
Publisher Date	2002-04-01
Access Restriction	Open
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Genetics

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Contrasting evolutionary forces in the Arabidopsis thaliana floral developmental pathway.