The molecular clock in long-lived tropical trees is independent of growth rate

Satake, Akiko and Imai, Ryosuke and Fujino, Takeshi and Tomimoto, Sou and Ohta, Kayoko and Na’iem, Mohammad and Indrioko, Sapto and Widiyatno, Widiyatno and Purnomo, Susilo and Mollá–morales, Almudena and Nizhynska, Viktoria and Tani, Naoki and Suyama, Yoshihisa and Sasaki, Eriko and Kasahara, Masahiro (2023) The molecular clock in long-lived tropical trees is independent of growth rate. eLife, 12. ISSN 2050084X

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Abstract

The rates of appearance of new mutations play a central role in evolution. However, mutational processes in natural environments and their relationship with growth rates are largely unknown, particular in tropical ecosystems with high biodiversity. Here, we examined the somatic mutation landscapes of two tropical trees, Shorea laevis (slow-growing) and S. leprosula (fast-growing), in central Borneo, Indonesia. Using newly-constructed genomes, we identified a greater number of somatic mutations in tropical trees than in temperate trees. In both species, we observed a linear increase in the number of somatic mutations with physical distance between branches. However, we found that the rate of somatic mutation accumulation per meter of growth was 3.7-fold higher in S. laevis than in S. leprosula. This difference in the somatic mutation rate was scaled with the slower growth rate of S. laevis compared to S. leprosula, resulting in a constant somatic mutation rate per year between the two species. We also found that somatic mutations are neutral within an individual, but those mutations transmitted to the next generation are subject to purifying selection. These findings suggest that somatic mutations accumulate with absolute time and older trees have a greater contribution towards generating genetic variation. © 2023, eLife Sciences Publications Ltd. All rights reserved.

Item Type: Article
Additional Information: Cited by: 3; All Open Access, Green Open Access
Uncontrolled Keywords: article; Borneo; genetic variation; growth rate; Indonesia; molecular clock; purifying selection; somatic mutation
Subjects: S Agriculture > SD Forestry
Divisions: Faculty of Forestry > Departemen Silvikultur
Depositing User: Sri JUNANDI
Date Deposited: 06 Nov 2024 08:11
Last Modified: 06 Nov 2024 08:11
URI: https://ir.lib.ugm.ac.id/id/eprint/10780

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