ABA flow modelling in Ricinus communis exposed to salt stress and variable nutrition

Peuke, Andreas D.

doi:10.1093/jxb/erw291

Cited by 18 publications

(13 citation statements)

References 45 publications

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“…Physiological responses to P deprivation are independent of ABA Contrary to previous studies where limited P increased [ABA] leaf (Jeschke et al 1997;Rothwell et al 2015), we found that low P decreased [ABA] leaf and [ABA] xylem in all graft combinations (Figure 4), which may result from changes in ABA biosynthesis, degradation, or long-distance transport (Jeschke et al 1997;Peuke 2016). The decreased root hydraulic conductance of P-deprived plants (Radin and Matthews 1989) should decrease leaf turgor, thereby stimulating leaf ABA accumulation, but no change in C leaf was detected in our study ( Figure 3A).…”

Section: Discussioncontrasting

confidence: 99%

“…Although [ABA] root and Ψ root were linearly related in salinized plants across all graft combinations (Figure C), this relationship was the opposite of that seen when WT plants were exposed to drying soil (Puértolas et al ). These contrasting relationships between [ABA] root and Ψ root suggest the need for flow modelling experiments (Wolf et al ; Peuke ) with reciprocally grafted plants, to distinguish local and long‐distance effects on root ABA status.…”

Section: Discussionmentioning

confidence: 99%

“…Most studies of root–shoot communication have imposed a single abiotic stress, but there is increasing interest in understanding plant responses to combined stresses (Mittler ; Atkinson and Urwin ; Zribi et al , ). A recent meta‐analysis showed that low phosphorus (P) conditions increase xylem ABA concentrations more than other nutritional stresses, with additive effects caused by salinity and nutrient limitations (Peuke ). Although saline soils reduce P bioavailability (Xu et al ), the physiological effects of combining these stresses were inconsistent (Grattan and Grieve ).…”

Section: Introductionmentioning

confidence: 99%

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Long-distance ABA transport can mediate distal tissue responses by affecting local ABA concentrations

Ollas

Dodd

2018

J. Integr. Plant Biol.

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Environmental stresses that perturb plant water relations influence abscisic acid (ABA) concentrations, but it is unclear whether long-distance ABA transport contributes to changes in local ABA levels. To determine the physiological relevance of ABA transport, we made reciprocal-and self-grafts of ABA-deficient flacca mutant and wild-type (WT) tomato plants, in which low phosphorus (P) conditions decreased ABA concentrations while salinity increased ABA concentrations. Whereas foliar ABA concentrations in the WT scions were rootstock independent under control conditions, salinity resulted in longdistance transport of ABA: flacca scions had approximately twice as much ABA when grafted on WT rootstocks compared to flacca rootstocks. Root ABA concentrations were scion dependent: both WT and flacca rootstocks had less ABA with the flacca mutant scion than with the WT scion under control conditions. In WT scions, whereas rootstock genotype had limited effects on stomatal conductance under control conditions, a flacca rootstock decreased leaf area of stressed plants, presumably due to attenuated root-to-shoot ABA transport. In flacca scions, a WT rootstock decreased stomatal conductance but increased leaf area of stressed plants, likely due to enhanced root-to-shoot ABA transport. Thus, long-distance ABA transport can affect responses in distal tissues by changing local ABA concentrations.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Long-distance ABA transport can mediate distal tissue responses by affecting local ABA concentrations

Ollas

Dodd

2018

J. Integr. Plant Biol.

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“…In addition to P-dependent root modifications, ethylene evolutionis regulated by P distribution, and mediates systemic P signaling leading to increases in root/shoot biomass during P deficiency ( Nagarajan and Smith, 2012 ). P deficiency can enhance xylem ABA concentration in response to changing nutrient solution P concentration or soil P availability ( Peuke, 2016 ). Nevertheless, hormones can act both locally and systemically, and it can be problematic to distinguish between these two modes of action ( Zhang et al, 2014 ).…”

Section: Introductionmentioning

confidence: 99%

Hormonal and Nutritional Features in Contrasting Rootstock-mediated Tomato Growth under Low-phosphorus Nutrition

et al. 2017

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Grafting provides a tool aimed to increase low-P stress tolerance of crops, however, little is known about the mechanism (s) by which rootstocks can confer resistance to P deprivation. In this study, 4 contrasting groups of rootstocks from different genetic backgrounds (Solanum lycopersicum var. cerasiforme and introgression and recombinant inbred lines derived from the wild relatives S. pennellii and S. pimpinellifolium) were grafted to a commercial F1 hybrid scion and cultivated under control (1 mM, c) and P deficient (0.1 mM, p) conditions for 30 days, to analyze rootstocks-mediated traits that impart low (L, low shoot dry weight, SDW) or high (H, high SDW) vigor. Xylem sap ionic and hormonal anlyses leaf nutritional status suggested that some physiological traits can explain rootstocks impacts on shoot growth. Although xylem P concentration increased with root biomass under both growing conditions, shoot biomass under low-P was explained by neither changes in root growth nor P transport and assimilation. Indeed, decreased root P export only explained the sensitivity of the HcLp rootstocks, while leaf P status was similarly affected in all graft combinations. Interestingly, most of the nutrients analyzed in the xylem sap correlated with root biomass under standard fertilization but only Ca was consistently related to shoot biomass under both control and low-P, suggesting an important role for this nutrient in rootstock-mediated vigor. Moreover, foliar Ca, S, and Mn concentrations were (i) specifically correlated with shoot growth under low-P and (ii) positively and negatively associated to the root-to-shoot transport of the cytokinin trans-zeatin (t-Z) and the ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC), respectively. Indeed, those hormones seem to play an antagonistic positive (t-Z) and negative (ACC) role in the rootstock-mediated regulation of shoot growth in response to P nutrition. The use of Hp-type rootstocks seems to enhance P use efficiency of a commercial scion variety, therefore could potentially be used for increasing yield and agronomic stability under low P availability.

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“…Instead, roots in drying soil alkalise xylem sap causing a redistribution of existing pools of ABA within the leaf that affects stomatal closure (Wilkinson, Corlett, Oger & Davies 1998), and other non-ABA chemical signals such as sulphate (Malcheska et al 2017) or jasmonic acid (De Ollas, Arbona, Gómez-Cadenas & Dodd 2018) may also be involved. ABA detected in the root system may either be synthesized locally or translocated from the shoot via the phloem (McAdam, Brodribb & Ross 2016), and ABA can recirculate between roots and shoots, with roots either acting as a sink for ABA or as a net exporter of ABA to the shoot, depending on plant nutrient and water status (Peuke 2016).…”

Section: Introductionmentioning

confidence: 99%

Overproduction of ABA in rootstocks alleviates salinity stress in tomato shoots

Martínez‐Andújar¹,

Martínez-Pérez²,

Albacete³

et al. 2020

Preprint

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To determine whether root-supplied ABA alleviates saline stress, tomato (Solanum lycopersicum L. cv. Sugar Drop) was grafted onto two independent lines overexpressing the SlNCED1 (9-cis-epoxycarotenoid dioxygenase) gene (NCED OE) and wild type rootstocks. After 200 days of salinity irrigation (EC = 3.5 dS m-1), plants with NCED OE rootstocks had 30% higher fruit yield, but root biomass and lateral root development was reduced. Although NCED OE rootstocks upregulated ABA-signalling (AREB, ATHB12), ethylene-related (ACCs, ERFs), aquaporin (PIPs) and stress-related (TAS14, KIN, LEA) genes, downregulation of PYL ABA receptors and signalling components (WRKYs), ethylene synthesis (ACOs) and auxin responsive factors occurred. Elevated SlNCED1 expression enhanced ABA levels in reproductive tissue while ABA catabolites accumulated in leaf and xylem sap suggesting homeostatic mechanisms. NCED OE also reduced xylem cytokinin transport to the shoot and stimulated foliar 2-isopentenyl adenine (iP) accumulation and phloem transport. Moreover, increased xylem gibberellin GA3 levels in growing fruit trusses was associated with enhanced reproductive growth. Improved photosynthesis without changes in stomatal conductance was consistent with hormone-mediated alteration of leaf growth and mesophyll structure, which combined with lower assimilate requirement in the roots and systemic changes in hormone balances could explain enhanced vigour, reproductive growth and yield under saline stress.

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ABA flow modelling in Ricinus communis exposed to salt stress and variable nutrition

Abstract: HighlightA meta-analysis of data shows that in Ricinus exposed to different nutritional conditions, xylem ABA concentration is better correlated with stomatal conductance, growth, and phloem sap ABA concentration than tissue ABA concentration.

Cited by 18 publications

References 45 publications

Long-distance ABA transport can mediate distal tissue responses by affecting local ABA concentrations

Long-distance ABA transport can mediate distal tissue responses by affecting local ABA concentrations

Hormonal and Nutritional Features in Contrasting Rootstock-mediated Tomato Growth under Low-phosphorus Nutrition

Overproduction of ABA in rootstocks alleviates salinity stress in tomato shoots

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