Evidence of non-structural carbohydrates-mediated response to flooding and salinity in Limonium narbonense and Salicornia fruticosa

Pellegrini, Elisa; Forlani, Giuseppe; Boscutti, Francesco; Casolo, Valentino

doi:10.1016/j.aquabot.2020.103265

Cited by 14 publications

(8 citation statements)

References 49 publications

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“…Considering that under stress conditions plants must produce osmolytes to protect the photosynthetic apparatus, maintain cell turgor and avoid a hydraulic failure, the results herein presented show that soluble sugars reach a concentration (about 260 nmol/mg FW) much higher than proline (concentration of 32 nmol/mg FW). In this respect, consistently with recent data on two halophytes [40], we can conclude that sugar metabolism gives a more substantial contribution to osmotic adjustment under drought stress. This notwithstanding, proline accumulation can benefit the cell through several other protective mechanisms [70].…”

Section: Discussionsupporting

confidence: 91%

“…T0 was subtracted from T15 , T17.5 and T20 , and the average value was compared with standard curves to calculate proline and amino acids content. As standard, samples from 2.5 to 15 µL of a 25 mM mixture of amino acids solution similar to their abundance in plant extracts (5 mM glutamine, 2 mM glutamate, 2 mM aspartate, 1 mM the other proteinogenic amino acids, proline included- [40]) were measured. Analyses were performed on 3-4 independent samples of 5-8 whole rosettes per sample collected at each time point.…”

Section: Proline and Amino Acids Quantificationmentioning

confidence: 99%

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Impact of Drought on Soluble Sugars and Free Proline Content in Selected Arabidopsis Mutants

Gurrieri

Merico

Trost

et al. 2020

Biology

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Water shortage is an increasing problem affecting crop yield. Accumulation of compatible osmolytes is a typical plant response to overcome water stress. Sucrose synthase 1 (SUS1), and glucan, water dikinase 2 (GWD2) and δ1-pyrroline-5-carboxylate synthetase 1 (P5CS1) are members of small protein families whose role in the response of Arabidopsis thaliana plants to mild osmotic stress has been studied in this work. Comparative analysis between wild-type and single loss-of-function T-DNA plants at increasing times following exposure to drought showed no differences in the content of water-insoluble carbohydrate (i.e., transitory starch and cell wall carbohydrates) and in the total amount of amino acids. On the contrary, water-soluble sugars and proline contents were significantly reduced compared to wild-type plants regardless of the metabolic pathway affected by the mutation. The present results contribute to assigning a physiological role to GWD2, the least studied member of the GWD family; strengthening the involvement of SUS1 in the response to osmotic stress; showing a greater contribution of soluble sugars than proline in osmotic adjustment of Arabidopsis in response to drought. Finally, an interaction between proline and soluble sugars emerged, albeit its nature remains speculative and further investigations will be required for complete comprehension.

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Section: Discussionsupporting

confidence: 91%

Section: Proline and Amino Acids Quantificationmentioning

confidence: 99%

Impact of Drought on Soluble Sugars and Free Proline Content in Selected Arabidopsis Mutants

Gurrieri

Merico

Trost

et al. 2020

Biology

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“…Flooding stress can accelerate leaf renewal, especially when flooding combines with other abiotic stresses e.g., salinity. Moreover, the physiological responses reported in literature for these two halophytes suggest the lack of growth limitation upon flooding stress [ 45 ].…”

Section: Discussionmentioning

confidence: 99%

“…The larger belowground biomass in L. narbonense upon flooding can probably be ascribed to the development of new adventitious roots, a common trait of flood-tolerant species to tackle soil anoxia [ 50 ], but not to an accumulation of carbon reserves in plant organs, which seems not to occur under abiotic stress [ 45 ]. Despite no data on root type being collected in this study (e.g., number or biomass of adventitious vs. seminal roots), the response observed for the two target species could provide indirect support to our explanatory hypothesis based on adventitious root development in L. narbonense .…”

Section: Discussionmentioning

confidence: 99%

Flooding and Soil Properties Control Plant Intra- and Interspecific Interactions in Salt Marshes

Pellegrini

Incerti

Pedersen

et al. 2022

Plants

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The stress gradient hypothesis (SGH) states that plant-plant interactions shift from competition to facilitation in increasing stress conditions. In salt marshes, edaphic properties can weaken the application of the SGH by amplifying the intensity of flooding and controlling plant zonation. We identified facilitative and competitive interactions along flooding gradients and tested the role of edaphic properties in exacerbating stress and shaping plant-plant interactions. Morphological traits of two target halophytes (Limonium narbonense and Sarcocornia fruticosa), flooding intensity, soil texture and soil organic C were recorded. The relative plant fitness index was assessed for the two species based on the relative growth in plurispecific rather than monospecific plant communities. Plant fitness increased with increasing stress supporting the SGH. L. narbonense showed larger fitness in plurispecific stands whereas S. fruticosa performed better in conspecific stands. Significant intra- or interspecific interactions were observed along the stress gradient defined by the combination of flooding and clay content in soil. When considering the limited soil organic C as stressor, soil properties were more important than flooding in defining plant-plant interactions. We highlight the need for future improvements of the SGH approach by including edaphic stressors in the model and their possible interactions with the main abiotic drivers of zonation.

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“…These carbohydrates are used to fuel resprouting after injury and seasonal rest (Asaeda et al, 2008;McLaurin et al, 1999), and mediate response to stress including drought, frost and flood (Patton et al, 2007;Pellegrini et al, 2020;Trifilò et al, 2019). There are two contrasting hypotheses regarding the purpose of non-structural carbohydrate accumulation in plants.…”

Section: Introductionmentioning

confidence: 99%

Trash or treasure: Rhizome conservation during drought

et al. 2023

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The role of storage carbohydrates in plant carbon economy is currently disputed as possibly passive accumulation when other resources are limiting growth, or part of a conservative growth strategy as insurance for regrowth and stress response. One indication may be the fate of carbohydrates in senescing rhizomes, as either translocated to be retained in the live and growing end of the rhizome or kept within the senescing rhizome end and lost into the soil for it to decompose. To examine carbohydrate storage in senescing rhizomes, eight rhizomatous species were grown in a split‐pot design with one compartment containing the forward‐growing and younger end of the rhizome and another containing the older end. Both compartments were either watered (control) or the older one was left un‐watered (drought treatment) to trigger rhizome senescence and potential carbohydrate translocation. Plant growth, root traits, and non‐structural carbohydrate types and concentrations were assessed in four sequential harvests. Drought treatment plants had higher rhizome dry matter content. Younger rhizome parts produced higher new rhizome and above‐ground biomass than older rhizome parts. Carbohydrate concentrations in rhizomes remained consistent for both treatments, younger and older rhizome parts, and all harvests, probably because of the translocation of water from the watered to the dry compartment to prevent senescence and rhizome loss. Contrary to expectations, the experimental treatment did not trigger rhizome senescence: plants responded by conserving the rhizome and resources within, rather than by losing their older parts. The invariant composition and concentration of carbohydrates within the rhizome suggest that rhizomes are essential plant organs and the storage carbohydrates they contain are necessary for regrowth after stress. Read the free Plain Language Summary for this article on the Journal blog.

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Evidence of non-structural carbohydrates-mediated response to flooding and salinity in Limonium narbonense and Salicornia fruticosa

Cited by 14 publications

References 49 publications

Impact of Drought on Soluble Sugars and Free Proline Content in Selected Arabidopsis Mutants

Impact of Drought on Soluble Sugars and Free Proline Content in Selected Arabidopsis Mutants

Flooding and Soil Properties Control Plant Intra- and Interspecific Interactions in Salt Marshes

Trash or treasure: Rhizome conservation during drought

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