Optimizing Crop Water Use for Drought and Climate Change Adaptation Requires a Multi-Scale Approach

Burridge, J D and Grondin, A and Vadez, V (2022) Optimizing Crop Water Use for Drought and Climate Change Adaptation Requires a Multi-Scale Approach. Frontiers in Plant Science (TSI), 13. pp. 1-14. ISSN 1664-462X

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Selection criteria that co-optimize water use efficiency and yield are needed to promote plant productivity in increasingly challenging and variable drought scenarios, particularly dryland cereals in the semi-arid tropics. Optimizing water use efficiency and yield fundamentally involves transpiration dynamics, where restriction of maximum transpiration rate helps to avoid early crop failure, while maximizing grain filling. Transpiration restriction can be regulated by multiple mechanisms and involves cross-organ coordination. This coordination involves complex feedbacks and feedforwards over time scales ranging from minutes to weeks, and from spatial scales ranging from cell membrane to crop canopy. Aquaporins have direct effect but various compensation and coordination pathways involve phenology, relative root and shoot growth, shoot architecture, root length distribution profile, as well as other architectural and anatomical aspects of plant form and function. We propose gravimetric phenotyping as an integrative, cross-scale solution to understand the dynamic, interwoven, and context-dependent coordination of transpiration regulation. The most fruitful breeding strategy is likely to be that which maintains focus on the phene of interest, namely, daily and season level transpiration dynamics. This direct selection approach is more precise than yield-based selection but sufficiently integrative to capture attenuating and complementary factors.

Item Type: Article
Divisions: Global Research Program - Accelerated Crop Improvement
Uncontrolled Keywords: drought, cross-scale coordination, water acquisition and use, selection criteria, transpiration restriction, vapor pressure deficit
Subjects: Others > Crop Physiology
Others > Drought
Depositing User: Mr Nagaraju T
Date Deposited: 12 Feb 2024 04:49
Last Modified: 12 Feb 2024 04:49
URI: http://oar.icrisat.org/id/eprint/12454
Official URL: https://www.frontiersin.org/journals/plant-science...
Acknowledgement: The paper was written and supported under the Make Our Planet Great Again (MOPGA) ICARUS project (Improve Crops in Arid Regions and Future Climates) funded by the Agence Nationale de la Recherche (ANR, grant ANR-17-MPGA-0011).
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