Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 539134
Title Mutations in EID1 and LNK2 caused light-conditional clock deceleration during tomato domestication
Author(s) Müller, Niels A.; Zhang, Lei; Koornneef, Maarten; Jiménez-Gómez, José M.
Source Proceedings of the National Academy of Sciences of the United States of America 115 (2018)27. - ISSN 0027-8424 - p. 7135 - 7140.
Department(s) Groep KoornneefGroep Koornneef
Publication type Refereed Article in a scientific journal
Publication year 2018
Keyword(s) Circadian rhythms - Domestication - Light signaling - Phytochrome - Tomato

Circadian period and phase of cultivated tomato (Solanum lycopersicum) were changed during domestication, likely adapting the species to its new agricultural environments. Whereas the delayed circadian phase is mainly caused by allelic variation of EID1, the genetic basis of the long circadian period has remained elusive. Here we show that a partial deletion of the clock gene LNK2 is responsible for the period lengthening in cultivated tomatoes. We use resequencing data to phylogenetically classify hundreds of tomato accessions and investigate the evolution of the eid1 and lnk2 mutations along successive domestication steps. We reveal signatures of selection across the genomic region of LNK2 and different patterns of fixation of the mutant alleles. Strikingly, LNK2 and EID1 are both involved in light input to the circadian clock, indicating that domestication specifically targeted this input pathway. In line with this, we show that the clock deceleration in the cultivated tomato is light-dependent and requires the phytochrome B1 photoreceptor. Such conditional variation in circadian rhythms may be key for latitudinal adaptation in a variety of species, including crop plants and livestock.

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