Developmental regulation of water uptake in wheat

Ruggiero, C.; Angelino, Giovanna; Maggio, Aurelio

doi:10.1016/j.jplph.2006.06.017

Cited by 8 publications

(10 citation statements)

References 49 publications

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“…This suggests that the cell-to-cell pathway (aquaporin-dependent) was the major determinant of the “intrinsic” water transport properties of the organ ( Lp r in control plants),RIL 149 showing the highest involvement of AQPs (72%) and RIL 043 the lowest (55%). The relative contribution of AQPs to root conductivity (average 60% in the present experiment with sunflower) was similar to other estimates obtained in herbaceous species (Maggio and Joly [1995]; Tazawa et al [1997]; Carvajal et al [1999]; Barrowclough et al [2000]; Shimizu et al [2005]; Sutka et al [2011]; Ruggiero et al [2007]) confirming that pathways not involving AQPs can make a significant contribution to Lp r (around 40%).…”

Section: Discussionsupporting

confidence: 91%

“…Here we used the same relatively high HgCl 2 concentration (500 μM). However, this value was similar to concentrations used in previous studies on whole root systems (Maggio and Joly [1995]; Peyrano et al [1997]; Shimizu et al [2005]; Ruggiero et al [2007]). In addition, considering that we worked with sand (in which root excretion of organic compounds creates an organic matrix) and not in a hydroponics set-up, the effective concentration in the root zone was probably far below 500 μM due to immobilization of part of the Hg 2+ by the system (Ruggiero et al [2007]).…”

Section: Discussionsupporting

confidence: 88%

“…However, this value was similar to concentrations used in previous studies on whole root systems (Maggio and Joly [1995]; Peyrano et al [1997]; Shimizu et al [2005]; Ruggiero et al [2007]). In addition, considering that we worked with sand (in which root excretion of organic compounds creates an organic matrix) and not in a hydroponics set-up, the effective concentration in the root zone was probably far below 500 μM due to immobilization of part of the Hg 2+ by the system (Ruggiero et al [2007]). The concentration used in this study was chosen from the preliminary dose response curves performed to identify a threshold concentration that had a marked effect on sap flow (for instance, 50 μM HgCl 2 did not induce any depressive effect on sap flow) but that did not cause apparent irreversible toxicity effects.…”

Section: Discussionsupporting

confidence: 88%

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Hydraulic conductivity and contribution of aquaporins to water uptake in roots of four sunflower genotypes

et al. 2014

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BackgroundThis article evaluates the potential of intraspecific variation for whole-root hydraulic properties in sunflower. We investigated genotypic differences related to root water transport in four genotypes selected because of their differing water use efficiency (JAC doi: 10.1111/jac.12079. 2014). We used a pressure-flux approach to characterize hydraulic conductance (L0) which reflects the overall water uptake capacity of the roots and hydraulic conductivity (Lpr) which represents the root intrinsic water permeability on an area basis. The contribution of aquaporins (AQPs) to water uptake was explored using mercuric chloride (HgCl2), a general AQP blocker.ResultsThere were considerable variations in root morphology between genotypes. Mean values of L0 and Lpr showed significant variation (above 60% in both cases) between recombinant inbred lines in control plants. Pressure-induced sap flow was strongly inhibited by HgCl2 treatment in all genotypes (more than 50%) and contribution of AQPs to hydraulic conductivity varied between genotypes. Treated root systems displayed markedly different L0 values between genotypes whereas Lpr values were similar.ConclusionsOur analysis points to marked differences between genotypes in the intrinsic aquaporin-dependent path (Lpr in control plants) but not in the intrinsic AQP-independent paths (Lpr in HgCl2 treated plants). Overall, root anatomy was a major determinant of water transport properties of the whole organ and can compensate for a low AQP contribution. Hydraulic properties of root tissues and organs might have to be taken into account for plant breeding since they appear to play a key role in sunflower water balance and water use efficiency.Electronic supplementary materialThe online version of this article (doi:10.1186/s40529-014-0075-1) contains supplementary material, which is available to authorized users.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 88%

Section: Discussionsupporting

confidence: 88%

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Hydraulic conductivity and contribution of aquaporins to water uptake in roots of four sunflower genotypes

et al. 2014

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“…Plants experience more dehydration stress during the day when transpiration exceeds the rate of water uptake and fully, or partially, recover during the night when the rate of water uptake exceeds the greatly diminished loss of water from leaves [20]. This creates a diurnal cycle of oscillating leaf water potential that is probably most pronounced during periods of moderate drought conditions [21,22].…”

Section: Discussionmentioning

confidence: 99%

Four distinct types of dehydration stress memory genes in Arabidopsis thaliana

et al. 2013

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BackgroundHow plants respond to dehydration stress has been extensively researched. However, how plants respond to multiple consecutive stresses is virtually unknown. Pre-exposure to various abiotic stresses (including dehydration) may alter plants’ subsequent responses by improving resistance to future exposures. These observations have led to the concept of ‘stress memory’ implying that during subsequent exposures plants provide responses that are different from those during their first encounter with the stress. Genes that provide altered responses in a subsequent stress define the ‘memory genes’ category; genes responding similarly to each stress form the ‘non-memory’ category.ResultsUsing a genome-wide RNA-Seq approach we determine the transcriptional responses of Arabidopsis plants that have experienced multiple exposures to dehydration stress and compare them with the transcriptional behavior of plants encountering the stress for the first time. The major contribution of this study is the revealed existence of four distinct, previously unknown, transcription memory response patterns of dehydration stress genes in A.thaliana. The biological relevance for each of the four memory types is considered in the context of four overlapping strategies employed by a plant to improve its stress tolerance and/or survival: 1) increased synthesis of protective, damage-repairing, and detoxifying functions; 2) coordinating photosynthesis and growth under repetitive stress; 3) re-adjusting osmotic and ionic equilibrium to maintain homeostasis; and 4) re-adjusting interactions between dehydration and other stress/hormone regulated pathways.ConclusionsThe results reveal the unknown, hitherto, existence of four distinct transcription memory response types in a plant and provide genome-wide characterization of memory and non-memory dehydration stress response genes in A.thaliana. The transcriptional responses during repeated exposures to stress are different from known responses occurring during a single exposure. GO analyses of encoded proteins suggested implications for the cellular/organismal protective, adaptive, and survival functions encoded by the memory genes. The results add a new dimension to our understanding of plants’ responses to dehydration stress and to current models for interactions between different signaling systems when adjusting to repeated spells of water deficits.

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“…2(c) (Wen et al, 2017;Han et al, 2018). Rapid changes in expression may allow plants to manage salt and other ions during peak, midday transpiration (Bramley et al, 2009), during critical periods like reproduction and early grain development (Ruggiero et al, 2007), and according to supply in the soil local to the root zone.…”

Section: Figmentioning

confidence: 99%

Dynamics in plant roots and shoots minimize stress, save energy and maintain water and nutrient uptake

et al. 2019

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Plants are inherently dynamic. Dynamics minimize stress while enabling plants to flexibly acquire resources. Three examples are presented for plants tolerating saline soil: transport of sodium chloride (NaCl), water and macronutrients is nonuniform along a branched root; water and NaCl redistribute between shoot and soil at night-time; and ATP for salt exclusion is much lower in thinner branch roots than main roots, quantified using a biophysical model and geometry from anatomy. Noninvasive phenotyping and precision agriculture technologies can be used together to harness plant dynamics, but analytical methods are needed. A plant advancing in time through a soil and atmosphere space is proposed as a framework for dynamic data and their relationship to crop improvement.

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Developmental regulation of water uptake in wheat

Cited by 8 publications

References 49 publications

Hydraulic conductivity and contribution of aquaporins to water uptake in roots of four sunflower genotypes

Hydraulic conductivity and contribution of aquaporins to water uptake in roots of four sunflower genotypes

Four distinct types of dehydration stress memory genes in Arabidopsis thaliana

Dynamics in plant roots and shoots minimize stress, save energy and maintain water and nutrient uptake

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