Cryptic Japanese maple species exhibit different drought tolerance, suggesting reproductive isolation
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Date
2024
Authors
Mori, ShigetaKurosawa, Yoko
Maruyama, Yutaka
Kikuchi, Satoshi
Ferrio Díaz, Juan Pedro
Ishida, Atsushi
Yamaji, Keiko
Journal Title
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Journal ContributionArticle
Abstract
Acer mono is thought to comprise seven varieties, but its classification and nomenclature are controversial. A recent molecular phylogenetic study suggested that A. mono varieties glabrum (G) and mayrii (M) do not interbreed, despite occurring syntopically (same location) and having a common genetic origin. However, if these are separate, reproductively isolated species, the basis for that isolation remains unclear. Here, we tested whether G and M can be considered separate species that differ in multiple ecological characteristics. We compared G and M in terms of distribution, habitats, drought tolerance of leaves, and flowering phenology of trees, and we verified their reproductive isolation (RI) in Japan. G showed higher drought and salt tolerance than M, which is consistent with the distribution of G in salt-stressed coastal areas with relatively low precipitation. In contrast, M occurs in snowy, mesic, and mountain habitats. Even in neighboring M and G trees, the onset of flowering in M is earlier than that of G. Similarly, flower drop in M is completed sooner than in G. Although the presence of post-zygotic reproductive barriers was not tested, the high calculated RI index probably contributes to RI. Two varieties of A. mono with a common genetic origin but different drought tolerance should be considered separate species. They likely shifted their climatic niches, involving local adaptation to different climatic conditions. This is roughly supported by an ENM-based niche analysis and significant differences in flowering time. These findings help to understand the physiological diversification of A. mono.
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Bibliographic citation
Mori, S., Kurosawa, Y., Maruyama, Y., Kikuchi, S., Ferrio, J. P., Ishida, A., & Yamaji, K. (2024). Cryptic Japanese maple species exhibit different drought tolerance, suggesting reproductive isolation. Ecological Research, 1440-1703.12512. https://doi.org/10.1111/1440-1703.12512
AGROVOC subjects
AcerEstrés de sequia
Estrés osmótico
Fenología
Aislamiento reproductivo
Other field subjects
AcerAcer mono var. glabrum and var. mayrii
ACER-MONO
Aislamiento reproductivo
Climate
drought and salt stress tolerance
ecological niche modeling (ENM)
Estrés De Sequia
estrés osmótico
Fenología
LEAF
Molecular phylogeography
Natural-Selection
phenology of flowering and leafing
PRESSUR
reproductive isolatio
Responses
Seedlings
Tree
Water relations
Sponsorship
This work was supported by the JSPS KAKENHI (grant numbers: 19H02987 and 24K01792). Juan Pedro Ferrio was supported by JSPS long-term invitation fellowship (L-14560) and Reference Group (Gobierno de Arag on, Spain) (H09_20R).