Differentiation of Andean and Mesoamerican accessions in a proposed core collection of grain amaranths

As climate change threatens agricultural yields, crop diversification, including the reintroduction of underutilized species, has emerged as a proposed solution for resilience. But what determines the extent of environmental change that underutilized crop species can cope with upon their reintroduction? One critical factor is maladaptive plasticity, a theoretical concept suggesting that populations may respond negatively to rapid environmental shifts, at least in the short term. To test this empirically, we conducted a repeated-measures study using historically underutilized Amaranthus species as a model. Upon reintroduction, we observed higher plasticity in vegetative and reproductive traits than in life-history traits. This suggests that while these species adapt to immediate environmental changes through adjustments in growth and reproduction, limited plasticity in life-history traits may constrain long-term adaptation. Our study aimed to (1) identify the environmental factors driving these plastic responses, (2) determine whether these responses are maladaptive, and (3) assess if maladaptive plasticity also occurs within native environments. Using machine learning models, we found that temperature was a primary driver of plastic responses. Generalized Additive Model (GAM) reaction norm analysis further revealed these temperature-induced responses to be maladaptive, suggesting a mismatch between Amaranthus' traits and the new environment. Applying transfer learning to predict responses in native settings, we found similar maladaptive responses to temperature, indicating that maladaptive plasticity may not be limited to non-native environments, thereby complicating climate adaptation efforts. This study underscore the need for detailed trait plasticity assessments before crop reintroduction for agricultural resilience.

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Adapting crops for climate change: regaining lost abiotic stress tolerance in crops

Palmgren,

Shabala

2024

Front. Sci.

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It is often stated that agricultural outputs need to increase substantially to meet the demands for more food posed by a growing population. However, when accounting for climate change, we argue that current projected increases are unrealistic and a more realistic goal would be to maintain yields per area of food production. This will require breeding for crops with increased tolerance to abiotic stresses such as drought, salinity, waterlogging, and high temperatures. This goal can be accomplished in one of two ways: by introducing stress tolerance genes into present high-yielding crops or by increasing the yields of already tolerant orphan crops and/or wild plants. We argue that the first strategy will require easing the restrictions on the use of gene editing technologies and making substantial improvements to cell-based phenotyping to identify the stress tolerance genes available in the gene pool of a crop and its wild relatives. The success of the second strategy will depend on the number of domestication genes that need to be selected for in order to obtain yields comparable to present-day cultivars. It is still too early to conclude which of the two strategies, rewilding (bringing genes lost from wild ancestors back to domesticated crops) or de novo domestication (domesticating resilient wild plants or underutilized crops directly), will be most effective for future sustainable agriculture. However, given the importance of the issue, some rapid action needs to be taken.

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Differentiation of Andean and Mesoamerican accessions in a proposed core collection of grain amaranths

Cited by 3 publications

References 32 publications

Atmospheric pin-to-plate cold plasma modification of amaranth starch & its application as a stabilizer in low-fat mayonnaise

Atmospheric pin-to-plate cold plasma modification of amaranth starch & its application as a stabilizer in low-fat mayonnaise

High plasticity increases phenotype-environment mismatch leading to sub-optimal performance in underutilized crop species

Adapting crops for climate change: regaining lost abiotic stress tolerance in crops

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