Wheat breeding highlights drought tolerance while ignores the advantages of drought avoidance: A meta-analysis

Li, Pufang; Ma, Bao–Luo; Palta, Jairo A.; Ding, Tong‐Tong; Cheng, Zheng‐Guo; Lv, Guang-Chao; Xiong, You‐Cai

doi:10.1016/j.eja.2020.126196

Cited by 36 publications

(27 citation statements)

References 49 publications

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“…A meta-analysis performed by Li et al 22 , showed that in contrast to popular breeding strategies for drought tolerant traits in wheat cultivars, wild cultivars with greater drought avoidance strategies actually showed greater overall yields and resulting aboveground biomass under severe drought conditions. However, the domesticated cultivars bred for drought tolerant traits showed greater success under less severe drought stressed conditions 22 . This study supports our findings that drought avoidance strategies may be beneficial to plants under more severe drought conditions.…”

Section: Discussionmentioning

confidence: 99%

Conditioned soils reveal plant-selected microbial communities that impact plant drought response

Monohon

Manter

Vivanco

2021

Sci Rep

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Rhizobacterial communities can contribute to plant trait expression and performance, including plant tolerance against abiotic stresses such as drought. The conditioning of microbial communities related to disease resistance over generations has been shown to develop suppressive soils which aid in plant defense responses. Here, we applied this concept for the development of drought resistant soils. We hypothesized that soils conditioned under severe drought stress and tomato cultivation over two generations, will allow for plant selection of rhizobacterial communities that provide plants with improved drought resistant traits. Surprisingly, the plants treated with a drought-conditioned microbial inoculant showed significantly decreased plant biomass in two generations of growth. Microbial community composition was significantly different between the inoculated and control soils within each generation (i.e., microbial history effect) and for the inoculated soils between generations (i.e., conditioning effect). These findings indicate a substantial effect of conditioning soils on the abiotic stress response and microbial recruitment of tomato plants undergoing drought stress.

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Section: Discussionmentioning

confidence: 99%

Conditioned soils reveal plant-selected microbial communities that impact plant drought response

Monohon

Manter

Vivanco

2021

Sci Rep

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“…Although deeper root exploration may enhance water absorption in droughtstressed conditions, the metabolic cost cannot compensate for the loss of aboveground plant growth. Similarly, small leaf and prolonged stomatal closure increased the capability of drought avoidance, but in the long run, it may lead to a signi cant reduction in grain yield (Li et al 2021). Therefore, a further increase in root length is not a wise approach for both grain yield and drought resistance because it will cause a decrease in carbon economy at the whole-plant scale.…”

Section: Discussionmentioning

confidence: 99%

“…Drought avoidance and drought tolerance are the dominant approaches for drought resistance conferred by crops than drought escape, and the drought resistance is associated with physiology and biochemical responses at molecular, cellular, tissue, organ, and whole plant levels Li et al 2021). Plants adapt to soil water de cit at the whole plant level by generating a more in-depth root system, smaller leaves, and rolling of leaves for reducing leaf water loss (Liu et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Thirty years of genetic progress combined with seed ethylene priming improved drought resistance of wheat through long-term drought stress memory

Yang

Zhao

et al. 2021

Preprint

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Knowledge of short-term physiological adaption of wheat to soil water deficit is well understood, but little is known about seed ethylene priming effect on long-term drought stress memory of dryland winter wheat. The 42 leading and new cultivars released between 1992 to 2017 were subjected to drought (45% Field water-holding capacity), and well-watered (75% Field water-holding capacity) conditions aim to screen cultivars with contrasting drought resistance and grain yield. Seeds primed with ethylene were subjected to both PEG-8000 and pure water to uncover ethylene-induced stress memory at both physiological and organ levels. Results showed that the soil water deficit (45%FC) that occurred at the tillering stage resulted in 3.2% to 67.4% yield loss for 42 cultivars, which was determined mainly by the decrease in the fertile spike. Seed ethylene priming maintained leaf water by reducing root volume and dry weight, which played a crucial role in drought avoidance. Seed ethylene priming decreased malondialdehyde content by regulating auxin and abscisic acid signaling, reactive oxygen species scavenging capability, and osmotic regulation, which plays a crucial role in drought tolerance. Seed ethylene priming improved drought tolerance of the wheat through metabolic modification of carbon metabolism, glutathione metabolism, and phenylpropanoid biosynthesis . The seed ethylene priming induced long-term stress memory that improved tillering capacity and reduced wheat spikelets abortion, which provided extra 0.3 t ha -1 of grain yield. These results suggested that seed ethylene priming allowed the recall of long-lasting stress defensive memory, increasing grain yield by both drought avoidance and drought tolerance.

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“…It has been strongly argued that much of the current success in improving the grain yield of crops under water stress has centred on “avoidance” strategies rather than “tolerance” [ 70 ]. Examination of the existing literature on root traits has provided a conceptual framework for targeted, constraint-related root research into tolerance and avoidance.…”

Section: Research Prioritiesmentioning

confidence: 99%

Pulse Root Ideotype for Water Stress in Temperate Cropping System

Rao

Armstrong

Silva‐Pérez

et al. 2021

Plants

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Pulses are a key component of crop production systems in Southern Australia due to their rotational benefits and potential profit margins. However, cultivation in temperate cropping systems such as that of Southern Australia is limited by low soil water availability and subsoil constraints. This limitation of soil water is compounded by the irregular rainfall, resulting in the absence of plant available water at depth. An increase in the productivity of key pulses and expansion into environments and soil types traditionally considered marginal for their growth will require improved use of the limited soil water and adaptation to sub soil constrains. Roots serve as the interface between soil constraints and the whole plant. Changes in root system architecture (RSA) can be utilised as an adaptive strategy in achieving yield potential under limited rainfall, heterogenous distribution of resources and other soil-based constraints. The existing literature has identified a “‘Steep, Deep and Cheap” root ideotype as a preferred RSA. However, this idiotype is not efficient in a temperate system where plant available water is limited at depth. In addition, this root ideotype and other root architectural studies have focused on cereal crops, which have different structures and growth patterns to pulses due to their monocotyledonous nature and determinant growth habit. The paucity of pulse-specific root architectural studies warrants further investigations into pulse RSA, which should be combined with an examination of the existing variability of known genetic traits so as to develop strategies to alleviate production constraints through either tolerance or avoidance mechanisms. This review proposes a new model of root system architecture of “Wide, Shallow and Fine” roots based on pulse roots in temperate cropping systems. The proposed ideotype has, in addition to other root traits, a root density concentrated in the upper soil layers to capture in-season rainfall before it is lost due to evaporation. The review highlights the potential to achieve this in key pulse crops including chickpea, lentil, faba bean, field pea and lupin. Where possible, comparisons to determinate crops such as cereals have also been made. The review identifies the key root traits that have shown a degree of adaptation via tolerance or avoidance to water stress and documents the current known variability that exists in and amongst pulse crops setting priorities for future research.

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Wheat breeding highlights drought tolerance while ignores the advantages of drought avoidance: A meta-analysis

Cited by 36 publications

References 49 publications

Conditioned soils reveal plant-selected microbial communities that impact plant drought response

Conditioned soils reveal plant-selected microbial communities that impact plant drought response

Thirty years of genetic progress combined with seed ethylene priming improved drought resistance of wheat through long-term drought stress memory

Pulse Root Ideotype for Water Stress in Temperate Cropping System

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