Abstract
Functions of S-like ribonucleases (RNases) differ considerably from those of S-RNases that function in self-incompatibility. Expression of S-like RNases is usually induced by low nutrition, vermin damage or senescence. However, interestingly, an Australian carnivorous plant Drosera adelae (a sundew), which traps prey with a sticky digestive liquid, abundantly secretes an S-like RNase DA-I in the digestive liquid even in ordinary states. Here, using D. adelae, Dionaea muscipula (Venus flytrap) and Cephalotus follicularis (Australian pitcher plant), we show that carnivorous plants use S-like RNases for carnivory: the gene da-I encoding DA-I and its ortholog cf-I of C. follicularis are highly expressed and constitutively active in each trap/digestion organ, while the ortholog dm-I of D. muscipula becomes highly active after trapping insects. The da-I promoter is unmethylated only in its trap/digestion organ, glandular tentacles (which comprise a small percentage of the weight of the whole plant), but methylated in other organs, which explains the glandular tentacles-specific expression of the gene and indicates a very rare gene regulation system. In contrast, the promoters of dm-I, which shows induced expression, and cf-I, which has constitutive expression, were not methylated in any organs examined. Thus, it seems that the regulatory mechanisms of the da-I, dm-I and cf-I genes differ from each other and do not correlate with the phylogenetic relationship. The current study suggests that under environmental pressure in specific habitats carnivorous plants have managed to evolve their S-like RNase genes to function in carnivory.
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Abbreviations
- FIS2:
-
FERTILIZATION INDEPENDENT SEED2
- FWA:
-
FLOWERING WAGENINGEN
- MPC:
-
MATERNALLY EXPRESSED PAB C-TERMINALLY
- PAGE:
-
Polyacrylamide gel electrophoresis
- RNase:
-
Ribonuclease
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Acknowledgments
This work was supported by a research grant from the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT) to T.O.
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The nucleotide sequences reported in this paper have been submitted to DDBJ under accession numbers AB811227, AB811228, AB811229, AB811230 and AB811231.
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Nishimura, E., Kawahara, M., Kodaira, R. et al. S-like ribonuclease gene expression in carnivorous plants. Planta 238, 955–967 (2013). https://doi.org/10.1007/s00425-013-1945-6
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DOI: https://doi.org/10.1007/s00425-013-1945-6