Comparative response to drought in primitive and modern wheat: a cue on domestication

Lv, Guang-Chao; Cheng, Zheng‐Guo; Li, Fengmin; Akram, Nudrat Aisha; Xiong, You‐Cai

doi:10.1007/s00425-019-03188-1

Cited by 19 publications

(24 citation statements)

References 43 publications

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“…Decreasing trends in root-shoot ratios at the transition from diploid to tetraploid, continuing further towards hexaploid wheat species, were also reported by (Zhang et al 2002) and (Zhao et al 2005). It is thus likely that also shoot-to-root allometries changed upon wheat evolution, similar to modifications in allometric relations within aboveground biomass distribution of modern compared to primitive wheat species (Lv et al 2019).…”

Section: Root-shoot Ratio Decreases From Wild Relatives Towards Durummentioning

confidence: 60%

Deep soil exploration vs. topsoil exploitation: distinctive rooting strategies between wheat landraces and wild relatives

et al. 2020

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Aims Diversity of root systems among genetic resources can contribute to optimize water and nutrient uptake. Topsoil exploitation vs. deep soil exploration represent two contrasting ideotypes in relation to resource use. Our study reveals how rooting patterns changed between wheat wild progenitors and landraces in regard to these ideotypes. Methods Root (partitioning, morphology, distribution, elongation, anatomy) and shoot traits (dry-matter, leaf area, assimilation) of durum landraces, wild emmer and wild einkorn from Iran, Syria, Turkey and Lebanon were phenotyped using the GrowScreen-Rhizo platform. Distinctive rooting patterns were identified via principal component analysis and relations with collection site characteristics analyzed. Results Shoot trait differentiation was strongly driven by seed weight, leading to superior early vigor of landraces. Wild progenitors formed superficial root systems with a higher contribution of lateral and early-emerging nodal axes to total root length. Durum landraces had a root system dominated by seminal axes allocated evenly over depth. Xylem anatomy was the trait most affected by the environmental influence of the collection site. Conclusions The durum landrace root system approximated a deep soil exploration ideotype which would optimize subsoil water uptake, while monococcum-type wild einkorn was most similar to a topsoil exploiting strategy with potential competitive advantages for subsistence in natural vegetation.

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Section: Root-shoot Ratio Decreases From Wild Relatives Towards Durummentioning

confidence: 60%

Deep soil exploration vs. topsoil exploitation: distinctive rooting strategies between wheat landraces and wild relatives

et al. 2020

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“…After a long period of domestication, the growth, yield and biomass distribution of wheat were significantly changed by both natural and artificial selection. 21,43 Water plays a pivotal role in nutrient availability and other physiological processes, and a major environmental factor affecting crop growth and yield. 44 In this study, although the number of genotypes of two species is still relatively small, which cannot fully represent the two species of wheat; however, the experimental data can explain somewhat the physiological response of wheat to different levels of drought stress.…”

Section: Discussionmentioning

confidence: 99%

Differentiate responses of tetraploid and hexaploid wheat (Triticum aestivum L.) to moderate and severe drought stress: a cue of wheat domestication

Gui

Sheteiwy

Zhu

et al. 2020

Plant Signaling & Behavior

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Differentiate mechanism of wheat species in response to contrasting drought stress gradients implies a cue of its long-term domestication. In the present study, three water regimes including well-watered control (WW, 80% field water capacity (FC)), moderate drought stress (MS, 50% FC,) and severe drought stress (SS, 30% FC) were designed to reveal different responses of eight wheat species (four tetraploid and four hexaploid) representing different breeding decades and genetic origins to drought stresses. The data indicated that 50% FC and 30% FC fell into the soil moisture threshold range of non-hydraulic and hydraulic root signal occurrence, respectively. In general, grain yield, grain number/spike weight per plant, aboveground biomass, harvest index (HI) and water use efficiency (WUE) were significantly higher in hexaploid species than those of tetraploid species under drought stress (P < .05). Particularly, nonhydraulic root signal was triggered and continuously operated under 50% FC, while hydraulic root signal was observed under 30% FC, respectively. Under 80% FC, the allometric exponent (ɑ) of M aboveground vs M root decreased from tetraploid to hexaploid (both were of <1), indicating that during the domestication, the hexaploid species allocated less biomass to root system. For the relationship of M ear vs M vegetative , the ɑ value was significantly greater in the hexaploid species, showing that hexaploid wheat distributed more biomass to ear than tetraploid to improve yield. Under 50% FC, this trend was enhanced. However, under 30% FC, there was no significant difference in the ɑ value between two species. Additionally, correlation analyses on yield formation affirmed the above results. Therefore, drought tolerance tended to be enhanced in hexaploid species under the pressure of artificial selection than that of tetraploid species. When drought stress exceeded a certain threshold, both species would be negatively seriously affected and followed a similar mechanism for better survival.

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“…Before imposing drought stress, all the pots were kept adequately watered (80% FWC) by weighing every 2–3 days (Lv et al. 2019, Ren et al. 2019).…”

Section: Methodsmentioning

confidence: 99%

“…Water consumption was the total of the water applied daily or every 2 days to each pot from sowing to harvest (Lv et al. 2019); shoot retention = shoot dry weight (each treatment)/shoot dry weight (WW and D1 treatment) and grain retention = grain dry weight (each treatment)/grain dry weight (WW and D1 treatment).…”

Section: Methodsmentioning

confidence: 99%

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Density‐ and moisture‐dependent effects of arbuscular mycorrhizal fungus on drought acclimation in wheat

Duan

Luo

Zhu

et al. 2021

Ecological Applications

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Arbuscular mycorrhizal fungus (AMF) is widely viewed as an ecosystem engineer to help plants adapt to adverse environments. However, a majority of the previous studies regarding AMF's eco‐physiological effects are mutually inconsistent. To clarify this fundamental issue, we conducted an experiment focused on wheat (Triticum aestivum L.) plants with or without AMF (Funneliformis mosseae) inoculation. Two water regimes (80% and 40% field water capacity, FWC80 (CK) and FWC40 (drought stress) and four planting densities (6 or 12 plants per pot as low densities, 24 or 48 plants per pot as high densities) were designed. AMF inoculation did not show significant effects on shoot biomass, grain yield, and water use efficiency (WUE) under the low densities, regardless of water regimes. However, under the high densities, AMF inoculation significantly decreased shoot biomass, grain yield and WUE in FWC80, while it significantly increased these parameters in FWC40, showing density and/or moisture‐dependent effects of AMF on wheat performance. In FWC40, the relationships between reproductive biomass (y‐axis) vs. vegetative biomass (x‐axis) (R‐V), and between grain biomass (y‐axis, sink) vs. leaf biomass (x‐axis, source) fell into a typical allometric pattern (α > 1, P < 0.001), and the AMF inoculation significantly increased the values of α. Yet in FWC80, they were in an isometric pattern (α ≈ 1, P < 0.001) and AMF addition had no significant effects on α. Similarly, AMF did not significantly change the isometric relationship between leaf biomass (i.e., metabolic rate) and shoot biomass (body size) in FWC80, while it significantly decreased the α of allometric relationship between both of them in FWC40 (α > 1, P < 0.001). We therefore, sketched a generalized model of R‐V and sink‐source relationships as affected by AMF, in which AMF inoculation might enhance the capabilities of sink acquisition and utilization under drought stress, while having no significant effect under the well watered conditions. Our findings demonstrate dual density‐ and moisture‐dependent effects of AMF on plant development and provide new insights into current ecological applications of AMF as an ecosystem engineer.

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Comparative response to drought in primitive and modern wheat: a cue on domestication

Cited by 19 publications

References 43 publications

Deep soil exploration vs. topsoil exploitation: distinctive rooting strategies between wheat landraces and wild relatives

Deep soil exploration vs. topsoil exploitation: distinctive rooting strategies between wheat landraces and wild relatives

Differentiate responses of tetraploid and hexaploid wheat (Triticum aestivum L.) to moderate and severe drought stress: a cue of wheat domestication

Density‐ and moisture‐dependent effects of arbuscular mycorrhizal fungus on drought acclimation in wheat

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