Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 14, Issue 4, Pages 6674-6689Publisher
MDPI
DOI: 10.3390/ijms14046674
Keywords
environmental epigenetics; transgenerational methylation; water stress; siRNAs; stomata; SPEECHLESS; FAMA
Funding
- Cocoa Research (UK) Ltd.
- Dutch Ministry of Agriculture, Nature and Food Quality (Ministerie van LNV)
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Transgenerational inheritance of abiotic stress-induced epigenetic modifications in plants has potential adaptive significance and might condition the offspring to improve the response to the same stress, but this is at least partly dependent on the potency, penetrance and persistence of the transmitted epigenetic marks. We examined transgenerational inheritance of low Relative Humidity-induced DNA methylation for two gene loci in the stomatal developmental pathway in Arabidopsis thaliana and the abundance of associated short-interfering RNAs (siRNAs). Heritability of low humidity-induced methylation was more predictable and penetrative at one locus (SPEECHLESS, entropy <= 0.02; chi(2) < 0.001) than the other (FAMA, entropy <= 0.17; chi(2) ns). Methylation at SPEECHLESS correlated positively with the continued presence of local siRNAs (r(2) = 0.87; p = 0.013) which, however, could be disrupted globally in the progeny under repeated stress. Transgenerational methylation and a parental low humidity-induced stomatal phenotype were heritable, but this was reversed in the progeny under repeated treatment in a previously unsuspected manner.
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