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Monotropastrum kirishimense (Ericaceae), a new mycoheterotrophic plant from Japan based on multifaceted evidence.

Authors :
Suetsugu, Kenji
Hirota, Shun K.
Hsu, Tian-Chuan
Kurogi, Shuichi
Imamura, Akio
Suyama, Yoshihisa
Source :
Journal of Plant Research. Jan2023, Vol. 136 Issue 1, p3-18. 16p.
Publication Year :
2023

Abstract

Due to their reduced morphology, non-photosynthetic plants have been one of the most challenging groups to delimit to species level. The mycoheterotrophic genus Monotropastrum, with the monotypic species M. humile, has been a particularly taxonomically challenging group, owing to its highly reduced vegetative and root morphology. Using integrative species delimitation, we have focused on Japanese Monotropastrum, with a special focus on an unknown taxon with rosy pink petals and sepals. We investigated its flowering phenology, morphology, molecular identity, and associated fungi. Detailed morphological investigation has indicated that it can be distinguished from M. humile by its rosy pink tepals and sepals that are generally more numerous, elliptic, and constantly appressed to the petals throughout its flowering period, and by its obscure root balls that are unified with the surrounding soil, with root tips that hardly protrude. Based on genome-wide single-nucleotide polymorphisms, molecular data has provided clear genetic differentiation between this unknown taxon and M. humile. Monotropastrum humile and this taxon are associated with different Russula lineages, even when they are sympatric. Based on this multifaceted evidence, we describe this unknown taxon as the new species M. kirishimense. Assortative mating resulting from phenological differences has likely contributed to the persistent sympatry between these two species, with distinct mycorrhizal specificity. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09189440
Volume :
136
Issue :
1
Database :
Academic Search Index
Journal :
Journal of Plant Research
Publication Type :
Academic Journal
Accession number :
161235678
Full Text :
https://doi.org/10.1007/s10265-022-01422-8