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

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 fam...

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Published inBiology (Basel, Switzerland) Vol. 9; no. 11; p. 367
Main Authors Gurrieri, Libero, Merico, Martina, Trost, Paolo, Forlani, Giuseppe, Sparla, Francesca
Format Journal Article
LanguageEnglish
Published MDPI AG 01.11.2020
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Abstract 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.
AbstractList 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.
Simple Summary: Drought has severe effects on plants, negatively impacting economic, agricultural and environmental processes. Depending on the duration and the strength of water stress conditions, plants adjust a series of physiological, cellular, and molecular mechanisms aimed at providing a correct stress response and, if possible, at establishing stress tolerance. The model plant Arabidopsis thaliana is one of the best tools for analyzing the involvement of specific genes in the response to drought. Thanks to this tool, the role of two genes encoding enzymes involved in sugars metabolism, and one gene encoding an enzyme involved in proline synthesis, have been investigated. In addition to suggesting an interaction between the metabolism of proline and that of soluble sugars, results broaden our understanding of the predominant role played by the accumulation of soluble sugars in counteracting mild osmotic stress.
Simple Summary: Drought has severe effects on plants, negatively impacting economic, agricultural and environmental processes. Depending on the duration and the strength of water stress conditions, plants adjust a series of physiological, cellular, and molecular mechanisms aimed at providing a correct stress response and, if possible, at establishing stress tolerance. The model plant Arabidopsis thaliana is one of the best tools for analyzing the involvement of specific genes in the response to drought. Thanks to this tool, the role of two genes encoding enzymes involved in sugars metabolism, and one gene encoding an enzyme involved in proline synthesis, have been investigated. In addition to suggesting an interaction between the metabolism of proline and that of soluble sugars, results broaden our understanding of the predominant role played by the accumulation of soluble sugars in counteracting mild osmotic stress. 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 [[delta].sup.1]-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. Keywords: drought stress; metabolic adjustment; proline; soluble sugars; water-insoluble carbohydrates
Audience Academic
Author Sparla, Francesca
Trost, Paolo
Gurrieri, Libero
Merico, Martina
Forlani, Giuseppe
AuthorAffiliation 2 Department of Life Science and Biotechnology, University of Ferrara, 44121 Ferrara, Italy; flg@unife.it
1 Department of Pharmacy and Biotechnology FaBiT, University of Bologna, 40126 Bologna, Italy; libero.gurrieri2@unibo.it (L.G.); martina.merico@hotmail.it (M.M.); paolo.trost@unibo.it (P.T.)
AuthorAffiliation_xml – name: 2 Department of Life Science and Biotechnology, University of Ferrara, 44121 Ferrara, Italy; flg@unife.it
– name: 1 Department of Pharmacy and Biotechnology FaBiT, University of Bologna, 40126 Bologna, Italy; libero.gurrieri2@unibo.it (L.G.); martina.merico@hotmail.it (M.M.); paolo.trost@unibo.it (P.T.)
Author_xml – sequence: 1
  givenname: Libero
  orcidid: 0000-0002-3537-2512
  surname: Gurrieri
  fullname: Gurrieri, Libero
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  surname: Merico
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  orcidid: 0000-0002-2103-4870
  surname: Sparla
  fullname: Sparla, Francesca
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Snippet Water shortage is an increasing problem affecting crop yield. Accumulation of compatible osmolytes is a typical plant response to overcome water stress....
Simple Summary: Drought has severe effects on plants, negatively impacting economic, agricultural and environmental processes. Depending on the duration and...
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SubjectTerms Amino acids
Arabidopsis thaliana
drought stress
Droughts
Environmental aspects
Genetic aspects
Glucose metabolism
Hardiness
Italy
metabolic adjustment
Physiological aspects
Plants
Proline
soluble sugars
Synthesis
water-insoluble carbohydrates
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Title Impact of Drought on Soluble Sugars and Free Proline Content in Selected Arabidopsis Mutants
URI https://search.proquest.com/docview/2457281221
https://pubmed.ncbi.nlm.nih.gov/PMC7692697
https://doaj.org/article/4c186403a1ee4bb6aca5ed0aa514ac4b
Volume 9
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