Abstract
Main Conclusion
Growth temperature and light intensity are major drivers of phenolic accumulation in Lotus corniculatus resulting in major changes in carbon partitioning which significantly affects tissue digestibility and forage quality.
Abstract
The response of plant growth, phenolic accumulation and tissue digestibility to light and temperature was determined in clonal plants of three genotypes of Lotus corniculatus (birdsfoot trefoil) cv Leo, with low, intermediate or high levels of proanthocyanidins (condensed tannins). Plants were grown from 10 °C to 30 °C, or at light intensities from 20 to 500 µm m−2 s−1. Plants grown at 25 °C had the highest growth rate and highest digestibility, whereas the maximum tannin concentration was found in plants grown at 15 °C. Approximately linear increases in leaf flavonol glycoside levels were found with increasing growth temperature in the low tannin genotype. Tannin hydroxylation increased with increasing growth temperature but decreased with increasing light intensity. The major leaf flavonols were kaempferol glycosides of which kaempferol-3-glucoside and kaempferol-3,7-dirhamnoside were the major components. Increases in both tannin and total flavonol concentrations in leaves were linearly related to light intensity and were preceded by a specific increase in the transcript level of a non-legume type chalcone isomerase. Changes in growth temperature and light intensity, therefore, result in major changes in the partitioning of carbon into phenolics, which significantly affects tissue digestibility and nutritional quality with a high correlation between tannin concentration and leaf digestibility.
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Change history
15 April 2021
A Correction to this paper has been published: https://doi.org/10.1007/s00425-021-03593-5
Abbreviations
- BuOH:
-
n-Butanol
- HCA:
-
Hydroxycinnamic acid
- IVDMD:
-
In-vitro-dry-matter-digestibility
- TGA:
-
Thioglycolic acid
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Acknowledgements
We would like to thank Julie Downsborough, Delma Jones and Alison Brooks for technical and analytical help. This research was supported by the BBSRC under the Global Environment Response Programme, (GERP grant number PG230/526), and BBSRC strategic grants to IGER (BBS/E/G/00003307,3120, 3390 and PU15), and the authors have no conflict of interest to declare.
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The original online version of this article was revised: The co-author Michael K Theodorou was not listed among the authors or in the author contribution statement and an additional person was missed from the acknowledgments section. The original article has been corrected.
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Morris, P., Carter, E.B., Hauck, B. et al. Responses of Lotus corniculatus to environmental change 3: The sensitivity of phenolic accumulation to growth temperature and light intensity and effects on tissue digestibility. Planta 253, 35 (2021). https://doi.org/10.1007/s00425-020-03524-w
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DOI: https://doi.org/10.1007/s00425-020-03524-w