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- Title
Differentiation of rhizosphere fungal assemblages by host ploidy level in mixed‐ploidy Larrea tridentata populations.
- Authors
Gerstner, Benjamin P.; Mann, Michael A.; Laport, Robert G.; Whitney, Kenneth D.
- Abstract
Polyploidy – whole genome duplication – is common in plants. Studies over the last several decades have documented numerous mixed‐ploidy populations. Whether arising via recurrent whole genome duplication events within a population, or from secondary contact, the persistence of mixed populations is possible by niche differentiation. Specifically, one mechanism facilitating ploidy co‐occurrence is microbially‐mediated niche differentiation (MMND), wherein cytotypes occupy different niches via interactions with different sets of microbes. Inherently cryptic, MMND is underexplored in polyploid plant populations. Here, we search for evidence of MMND in creosotebush Larrea tridentata, a dominant desert shrub of the southwestern US and northern Mexico. We sequenced root‐associated fungal taxa in soils of diploid, autotetraploid, and autohexaploid plants growing in two naturally‐occurring mixed‐cytotype populations. Within populations, we found substantial fungal assemblage overlap across host plant cytotypes. However, using indicator species analysis, we identified some fungi that are differentiated by host plant cytotype, satisfying a necessarycondition for MMND. Future study is needed to determine the degree of niche differentiation conferred, if any, and whether the identified fungi play a role in the long‐term persistence of multiple cytotypes within populations.
- Subjects
MEXICO; LARREA; PLOIDY; RHIZOSPHERE; HOST plants; PLANT populations
- Publication
Oikos, 2024, Vol 2024, Issue 5, p1
- ISSN
0030-1299
- Publication type
Article
- DOI
10.1111/oik.09856