The role of polyploidy on mycorrhizal associations in the orchid Zygopetalum mackayi hook

• Grant number: 18/02196-3
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: March 01, 2019
• End date: February 29, 2020
• Field of knowledge: Biological Sciences - Botany
• Principal Investigator: Samantha Koehler
• Grantee: Gabriel Mendes Cirilo
• Host Institution: Instituto de Biologia (IB). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

Polyploidy affects biological interactions and, therefore, may determine the reproductive isolation of cytotypes. Mycorrhiza is a key interaction for all orchid species. The spatial distribution of mycorrhizal fungi may determine the geographical distribution of orchid populations and the spatial isolation of individuals within populations. However, we have little knowledge on the role of polyploidy on mycorrhizal associations. The only known study showed a difference in the mycorrhizal community among different sympatric cytotypes. This suggests the variation on mycorrhizal associations may cause sympatric speciation because of the spatial segregation of cytotypes. In this project, we test this hypothesis considering diferent cytotypes of the Z. mackayi orchid. We will sample a mixed-cytotype population in Santo Antonio do Itambé (MG), considering the altitudinal gradient. Samples of leaves and roots will be sequenced for identification of citotypes and mycorrhiza. (AU)