Document Type

Article

Publication Date

2019

DOI

10.1656/058.018.0110

Publication Title

Southeastern Naturalist

Volume

18

Issue

1

Pages

147-164

Abstract

We evaluated whether geographic distance and soil characteristics influence genetic structure of nitrogen-fixing bacterial symbionts associated with the host plant Chamaecrista fasciculata (Partridge Pea). We tested phylogeographic clustering and associations between genetic distance, geographic distance, and soil variables using sequences of 2 bacterial genes and soil chemistry across 23 sites in Mississippi. We identified rhizobia isolated from Partridge Pea as Bradyrhizobium. We detected significant genetic structure at a regional level, and determined that rhizobia within each region were more phylogenetically related than expected. Significant correlation between genetic distance and distances based on soil chemistry suggests environmental influences on rhizobia diversity. High levels of diversity among rhizobia over small spatial scales suggest that symbionts respond to local factors. Understanding geographic diversity in natural assemblages of rhizobia aids in predicting how hosts and symbionts respond to environmental perturbations.

Comments

"The publisher, Eagle Hill Institute reserves the copyright to all its publications. Any reproduction, other than for an individual's own personal and private use, or distribution of journal content is prohibited without written permission from Eagle Hill Institute.

Authors of articles published in the Southeastern Naturalist are allowed to post the pdf reprints of their articles on their own website, as well as personally distribute copies to their colleagues, provided they do so along with a clear statement of the Institute's copyright policy as stated above."

Original Publication Citation

Dorman, H. E., & Wallace, L. E. (2019). Diversity of nitrogen-fixing symbionts of Chamaecrista fasciculata (Partridge pea) across variable soils. Southeastern Naturalist, 18(1), 147-164. doi:10.1656/058.018.0110

s18-1-S2494-Wallace-s1.pdf (536 kB)
Voucher information and GPS coordinates of locations containing Chamaecrista fasciculata sampled for this study.

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