Maize root responses to drought stress depend on root class and axial position

Hazman, Mohamed; Kabil, Farida F.

doi:10.1007/s10265-021-01348-7

Cited by 18 publications

(10 citation statements)

References 44 publications

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“…In this study, while acknowledging that wind exposure might differ between the upland and lowland transects, we believe the greater phenol concentrations of the stover and roots in the upland transect were more likely due to droughtier conditions. Lignification, that is phenol enrichment, is a known response of plants to drought stress (Enstone et al, 2003;Le Gall et al, 2015), and specifically of maize (Hu et al, 2009;Zhang et al, 2020), especially in specific segments of the roots (Hazman and Kabil, 2022), which is consistent with our results. Increased lignification of root cell walls has been linked with maintained water uptake and transport within the plant during drought conditions (Fan et al, 2006;Moura et al, 2010).…”

Section: Discussionsupporting

confidence: 92%

Variable humic product effects on maize structural biochemistry across annual weather patterns and soil types in two Iowa (U.S.A.) production fields

Olk

Dinnes²,

Hatfield³

et al. 2023

Front. Plant Sci.

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Agronomic benefits of humic product application to crops are receiving increasing attention, though underlying biochemical changes remain unexplored, especially in field settings. In this study, maize (Zea mays L.) concentrations of 11 phenol and five carbohydrate monomers were determined in whole plant stover (four growing seasons) and roots (two growing seasons) at physiological maturity for two rainfed fields in Iowa (USA) having humic product applications. Stover and root tissues tended toward greater phenol concentrations in a drier upland transect but greater carbohydrate concentrations in a wetter lowland transect. Two humic treatments further accentuated these trends in upland roots. Their phenol content increased significantly with humic application in the droughtier season of root sampling (2013). Phenol increases above the unamended control averaged 20% for each monomer. Total phenols increased above the control by 12% and 19% for the two humic treatments. Five carbohydrate monomers in the upland roots did not respond to humic application. In the second year of root sampling (2014), which had abundant rainfall, upland root phenols did not respond substantively to humic application, but root carbohydrates increased on average by 11 or 20% for the two humic treatments compared to the control, reaching significance (P< 0.10) in 7 of 10 cases. Upland stover phenol concentrations responded differently to humic product application in each of four years, ranging from numeric increases in the droughtiest year (2012) to significant decreases with abundant rainfall (2014). In the lowland transect, root phenols and carbohydrates and stover phenols responded inconsistently to humic application in four years. Stover carbohydrates did not respond consistently to humic application in either transect. The phenols that were more responsive to humic application or to droughtier conditions included p-coumaric acid and syringaldehyde, which are heavily involved in late-season maize lignification. In summary, humic product application further promoted root lignification, a natural response to drought. Yet under non-drought conditions it promoted root carbohydrate production. Carbohydrate production might be the intrinsic plant response to humic product application in stress-free conditions. These results indicate complex interactions in field conditions between plant biochemistry, environmental signals, and the humic product.

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Section: Discussionsupporting

confidence: 92%

Variable humic product effects on maize structural biochemistry across annual weather patterns and soil types in two Iowa (U.S.A.) production fields

Olk

Dinnes²,

Hatfield³

et al. 2023

Front. Plant Sci.

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“…Roots are the main plant organs responsible for water and nutrient uptake; thus, their traits are well associated with enhancing crop performance under different soil-borne environmental stresses such as drought or salinity [55]. The tomato plant readily generates stem-borne roots during its normal developmental stages and is considered a model plant for studying root architectural traits [56].…”

Section: Soil Propertiesmentioning

confidence: 99%

Effect of Biochar Application to Fertile Soil on Tomato Crop Production under Saline Irrigation Regime

et al. 2022

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Biochar application is a promising sustainable strategy for enhancing soil properties thus crop production. However, biochar application to soil certainly alters its biological and physical properties, and could require extra costs. Therefore, biochar suitability to agroecosystems must be proactively estimated. The advantage of biochar addition to poor fertile or weathered soils has been well studies, however, its feasibility to fertile soil under low quality (saline) irrigation water was not frequently studied. Consequently, this work investigates the hypothesis of whether the application of biochar at a rate of 4.8 tons/ha to fertile soil (Nile Valley, Giza, Egypt) would ameliorate the negative effects of saline irrigation regime (3000 ppm) on tomato crop and soil. The results of two seasons experiments showed that saline irrigation significantly reduced tomato crop yield by an average reduction ratio of 51%, and biochar addition could not compensate such reduction. Furthermore, biochar did not reduce accumulated Na+ in fruits or roots. Tomato fruits produced from biochar-added soil were lower in TSS levels (41.7% reduction ratio) yet larger in diameter by approximately 1.5-fold increase. Interestingly, biochar addition into soil greatly promotes the length of stem-borne lateral roots and elevates the expression of LeNR (encodes nitrate reductase enzyme) in leaves yet under fresh irrigation regime. For soil properties, biochar application enhanced the soil properties under either saline or fresh water irrigation conditions. Collectively, it is assumed that biochar application to fertile soil in Nile Valley of Egypt could not alleviate tomato fruits yield reduction affected by applied saline irrigation regime.

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“…These conclusions were similar to those obtained in the T2 period analysis in this study. Drought stress could promote lateral root development, and induce lateral roots to grow into the middle soil layer to absorb more water, thereby increasing root biomass ( Hussain et al., 2020 ; Hazman & Kabil, 2022 ). Also, this study showed that RSA, RLT and RNB in the 30 cm layer increased with increasing drought.…”

Section: Discussionmentioning

confidence: 99%

The persistent impact of drought stress on the resilience of summer maize

et al. 2023

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Crop resilience refers to the adaptive ability of crops to resist drought at a certain level. Currently, most of the research focuses on the changes in root or photosynthesis traits of crops after drought and rehydration. Still, the persistence effect (drought period (T2) - rehydration period (T3) - harvest period (T4)) of drought stress on crops and quantitative estimation of resilience is still unclear. Field experiments were conducted in this study to determine the persistence effects on above-ground and below-ground growth indicators of summer maize at different levels and durations of drought. Next, an evaluation method for integrated resilience of summer maize was proposed, and a quantitative assessment of integrated resilience was made by Principal Component Analysis (PCA) and resilience index calculation. The results showed that the resilience of summer maize decreased with increasing drought levels, which persisted until harvest. Although summer maize resilience was strong after rewatering under light drought (DR1), declined after sustained rewatering. At the same time, production had decreased. However, a specific drought duration could improve the resilience of summer maize under light drought conditions. In particular, leaf biomass and root growth in the 30-50 cm layer could be enhanced under long duration light drought (LDR1), thus improving summer maize resilience and yield. Thus, under water shortage conditions, a certain level and duration drought could improve the resilience and yield of summer maize, which would persist until harvest. Clarifying the persistent effects on the growth indicators of summer maize and quantitatively evaluating the resilience of summer maize could improve agricultural food production and water use efficiency.

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Maize root responses to drought stress depend on root class and axial position

Cited by 18 publications

References 44 publications

Variable humic product effects on maize structural biochemistry across annual weather patterns and soil types in two Iowa (U.S.A.) production fields

Variable humic product effects on maize structural biochemistry across annual weather patterns and soil types in two Iowa (U.S.A.) production fields

Effect of Biochar Application to Fertile Soil on Tomato Crop Production under Saline Irrigation Regime

The persistent impact of drought stress on the resilience of summer maize

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