The case for improving crop carbon sink strength or plasticity for a CO2 rich future

A - Papers appearing in refereed journals

Dingkuhn, M., Luquet, D., Fabre, D., Muller, B., Yin, X. and Paul, M. J. 2020. The case for improving crop carbon sink strength or plasticity for a CO2 rich future. Current Opinion in Plant Biology. https://doi.org/10.1016/j.pbi.2020.05.012

AuthorsDingkuhn, M., Luquet, D., Fabre, D., Muller, B., Yin, X. and Paul, M. J.
Abstract

Atmospheric CO2 concentration [CO2] has increased from 260 to 280 μmol mol−1 (level during crop domestication up to the industrial revolution) to currently 400 and will reach 550 μmol mol−1 by 2050. C3 crops are expected to benefit from elevated [CO2] (e-CO2) thanks to photosynthesis responsiveness to [CO2] but this may require greater sink capacity. We review recent literature on crop e-CO2 responses, related source-sink interactions, how abiotic stresses potentially interact, and prospects to improve e-CO2 response via breeding or genetic engineering. Several lines of evidence suggest that e-CO2 responsiveness is related either to sink intrinsic capacity or adaptive plasticity, for example, involving enhanced branching. Wild relatives and old cultivars mostly showed lower photosynthetic rates, less downward acclimation of photosynthesis to e-CO2 and responded strongly to e-CO2 due to greater phenotypic plasticity. While reverting to such archaic traits would be an inappropriate strategy for breeding, we argue that substantial enhancement of vegetative sink vigor, inflorescence size and/or number and root sinks will be necessary to fully benefit from e-CO2. Potential ideotype features based on enhanced sinks are discussed. The generic ‘feast-famine’ sugar signaling pathway may be suited to engineer sink strength tissue-specifically and stage-specifically and help validate ideotype concepts. Finally, we argue that models better accounting for acclimation to e-CO2 are needed to predict which trait combinations should be targeted by breeders for a CO2-rich world.

Year of Publication2020
JournalCurrent Opinion in Plant Biology
Digital Object Identifier (DOI)https://doi.org/10.1016/j.pbi.2020.05.012
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeDesigning Future Wheat (DFW) [ISPG]
Output statusPublished
Publication dates
Online15 Jul 2020
PublisherElsevier
ISSN1369-5266

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