Reproductive development and genetic structure of the mycoheterotrophic orchid Pogoniopsis schenckii Cogn.
Open Access
- 12 July 2021
- journal article
- research article
- Published by Springer Science and Business Media LLC in BMC Plant Biology
- Vol. 21 (1), 1-14
- https://doi.org/10.1186/s12870-021-03118-y
Abstract
Pogoniopsis schenckii Cogn. is a mycoheterotrophic orchid that can be used as a model to understand the influence of mycoheterotrophy at different stages of the reproductive cycle. We aimed to verify the presence of endophytic and epiphytic fungi at each stage of the reproductive process and investigated how the breeding system may relate to genetic structure and diversity of populations. In this study we performed anatomical and ultrastructural analyses of the reproductive organs, field tests to confirm the breeding system, and molecular analysis to assess genetic diversity and structure of populations. During the development of the pollen grain, embryo sac and embryogenesis, no fungal infestation was observed. The presence of endophytic fungal hyphae was observed just within floral stems and indehiscent fruit. Beyond assuring the presence of fungus that promote seed germination, specific fungi hyphae in the fruit may affect other process, such as fruit ripening. As other mycoheterotrophic orchids, P. schenckii is autogamous, which may explain the low genetic diversity and high genetic structure in populations. We discuss an interesting interaction: fungal hyphae in the indehiscent fruit. These fungal hyphae seem to play different roles inside fruit tissues, such as acting in the fruit maturation process and increasing the proximity between fungi and plant seeds even before dispersion occurs. As other mycoheterotrophic orchids, P. schenckii is autogamous, which may explain the low genetic diversity and high genetic structure in populations. Altogether, our findings provide important novel information about the mechanisms shaping ecology and evolution of fragmented populations of mycoheterotrophic plant.This publication has 89 references indexed in Scilit:
- Effects of clonality on the genetic variability of rare, insular species: the case of Ruta microcarpa from the Canary IslandsEcology and Evolution, 2013
- Programmed Cell Death Occurs Asymmetrically during Abscission in TomatoTHE PLANT CELL ONLINE, 2011
- The role of vacuole in plant cell deathCell Death & Differentiation, 2011
- Changes in ultrastructure, protease and caspase-like activities during flower senescence in Lilium longiflorumPlant Science, 2011
- Understanding plant reproductive diversityPhilosophical Transactions B, 2010
- A comparison of SNP and STR loci for delineating population structure and performing individual genetic assignmentBMC Genomic Data, 2010
- Fungal specificity bottlenecks during orchid germination and developmentMolecular Ecology, 2008
- Histone modifications and chromatin dynamics: a focus on filamentous fungiFEMS Microbiology Reviews, 2008
- Impact of mating systems on patterns of sequence polymorphism in flowering plantsProceedings. Biological sciences, 2006
- Effects of life history traits on genetic diversity in plant speciesPhilosophical Transactions B, 1996