Dryland productivity under a changing climate

Wang, Lixin; Jiao, Wenzhe; MacBean, Natasha; Rulli, Maria Cristina; Manzoni, Stefano; Vico, Giulia; D’Odorico, Paolo

doi:10.1038/s41558-022-01499-y

Cited by 75 publications

(38 citation statements)

References 117 publications

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“…They are key regions for global food security as it is estimated that they are responsible for about 60% of global food production (Wang et al, 2022). They also play an important role for the global carbon budget (Wang et al, 2022). Climate change is expected to have a negative impact on agriculture in drylands with direct consequences for the livelihood of about 178 million people by 2050 under a 1.5°C temperature increase scenario (Wang et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

“…They also play an important role for the global carbon budget (Wang et al, 2022). Climate change is expected to have a negative impact on agriculture in drylands with direct consequences for the livelihood of about 178 million people by 2050 under a 1.5°C temperature increase scenario (Wang et al, 2022). There is therefore an urgent need to devise new agricultural practices and crop varieties to address this challenge.…”

Section: Discussionmentioning

confidence: 99%

“…Drylands, defined as regions where precipitation is lower than atmospheric water demand, cover around 40% of the land surface and host about 2 billion people (Wang et al, 2022). They are key regions for global food security as it is estimated that they are responsible for about 60% of global food production (Wang et al, 2022). They also play an important role for the global carbon budget (Wang et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

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Glutaredoxin regulation of primary root growth is associated with early drought stress tolerance in pearl millet

Cantó

Grondin

Sine

et al. 2023

Preprint

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Seedling root traits impact plant establishment under challenging environments. Pearl millet is one of the most heat and drought tolerant cereal crops that provides a vital food source across the sub-Saharan Sahel region. Pearl millet's early root system features a single fast-growing primary root which we hypothesize is an adaptation to the Sahelian climate. Using crop modelling, we demonstrate that early drought stress is an important constraint in agrosystems in the Sahel where pearl millet was domesticated. Furthermore, we show that increased pearl millet primary root growth is correlated with increased early water stress tolerance in field conditions. Genetics including GWAS and QTL approaches identify genomic regions controlling this key root trait. Combining gene expression data, re-sequencing and reannotation of one of these genomic regions identified a glutaredoxin-encoding gene PgGRXC9 as the candidate stress resilience root growth regulator. Functional characterization of its closest Arabidopsis homolog AtROXY19 revealed a novel role for this glutaredoxin (GRX) gene clade in regulating cell elongation. In summary, our study suggests a conserved function for GRX genes in conferring root cell elongation and enhancing resilience of pearl millet to its Sahelian environment.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Glutaredoxin regulation of primary root growth is associated with early drought stress tolerance in pearl millet

Cantó

Grondin

Sine

et al. 2023

Preprint

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“…Much of this demand ends up being translated -either directly (ensuring freshwater supplies) or indirectly (using water to increase crop yields)-, in an increase in the ratio of total water withdrawal to available renewable water (water gap hereafter). This water gap is also increasing by the decrease in water supply due to climate change, which is altering the distribution of rainfall and increasing both snowmelt and evapotranspiration Wang et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Complex Policy Mixes are Needed to Cope with Agricultural Water Demands Under Climate Change

Martínez‐Valderrama

Cantos

Delacámara

et al. 2023

Water Resour Manage

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The divergence between agricultural water use and the annual supply of water resources (water gap) has been increasing for decades. The forecast is that this water gap will continue to widen, compromising the water security of a large share of the global population. On the one hand, the increase in demand is attributed to an ever-growing population that, in addition, is adopting a high-water consumption per capita lifestyle (e.g., meat-rich diet, increased use of biofuels and of irrigated agriculture). On the other hand, climate change is increasing aridification and the spatio-temporal heterogeneity of precipitation worldwide. The water gap is particularly acute in drylands, where development and food security has been based on the massive exploitation of water resources, particularly groundwater. Here we analyze the mechanisms underlying this water gap, which is mainly driven by water use in agriculture, and suggest suitable solutions that can help to close it. Using causal diagrams, we show how population generates different demands that create a water gap that prevailing supply-side solutions cannot close. Indeed, it has been widening over the years because water consumption has grown exponentially. This behaviour is explained by a series of mechanisms that it is necessary to understand to realize the complexity of water scarcity problems. For solving the water gap, we propose and exemplify eight lines of action that can be combined and tailored to each territory. Our analyses corroborate the urgent need to plan an integral management of water resources to avoid widespread scenarios of water scarcity under future climatic conditions.

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“…These positive effects on plant growth induced by fog are supposed to be stronger in drylands where the amount of fog deposition can sometimes exceed rainfall (Weathers et al., 2019). Thus, fog is regarded as an important water source in some dryland ecosystems (Hachfeld, 2000; Runyan et al., 2019), which means that fog could play an important role in shaping the vegetation composition and ecosystem structure of fog‐dependent ecosystems in dryland regions (Wang et al., 2022). Understanding fog impacts on vegetation could provide further information on regional and global carbon‐water cycle, biodiversity, and ecosystem structure.…”

Section: Introductionmentioning

confidence: 99%

Fog Detection and Estimation Using CALIPSO Lidar Observations

Qiao

Wang

Marais

et al. 2022

Geophysical Research Letters

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It has been reported that fog showed positive impacts on vegetation from various ecosystems in many parts of the world such as the Namib Desert (Eckardt et al., 2013;Mitchell et al., 2020), the coastal California redwood forest (Burgess & Dawson, 2004), and the Atacama Desert (Aravena et al., 1989). Fog can maintain vegetation photosynthetic function and sustain biogeochemical dynamics during rainless periods (Scholl et al., 2011;Wang et al., 2017). Previous studies have demonstrated the mechanisms of plant fog water uptake in drylands either through foliar water uptake or through shallow roots (

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Dryland productivity under a changing climate

Cited by 75 publications

References 117 publications

Glutaredoxin regulation of primary root growth is associated with early drought stress tolerance in pearl millet

Glutaredoxin regulation of primary root growth is associated with early drought stress tolerance in pearl millet

Complex Policy Mixes are Needed to Cope with Agricultural Water Demands Under Climate Change

Fog Detection and Estimation Using CALIPSO Lidar Observations

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