Interaction between exogenous glycine betaine and the photorespiratory pathway in canola leaf discs

Sulpice, Ronan; Gibon, Yves; Cornic, Gabriel; Larher, F.

doi:10.1034/j.1399-3054.2002.1160404.x

Cited by 18 publications

(10 citation statements)

References 43 publications

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“…For example, Larher et al (1995) found that exogenous GB exerts inhibitory effects on osmo-induced proline accumulation in rape leaf discs suggesting that it is not a compatible solute. In contrast, Sulpice et al (2002) found an increase in leaf proline concentration in response to exogenous GB application in canola leaf discs. The difference between the results of the present experiment and those of the above mentioned studies can be explained by the fact that in the present study, GB was sprayed on intact plants, whereas contradictory results of some pervious studies (Larher et al 1995;Sulpice et al 2002) were based on indirect evidence (in vitro).…”

Section: Discussionmentioning

confidence: 60%

“…The present findings clearly showed nonsignificant effects of exogenous pre-sowing or foliar application of GB on total free amino acids in sunflower plants grown under both normally irrigated and drought stressed regimes. In contrast, Sulpice et al (2002) reported a marked increase (2-to 3-fold) in free amino acids by exogenous application of GB on detached leaf discs of Arabidopsis thaliana and Brassica napus.…”

Section: Discussionmentioning

confidence: 79%

“…Makela et al (1996) also reported a non-significant role of foliar supplied GB in alleviating the adverse effects of drought stress on growth of Brassica napus. The enhancement of endogenous GB level by its exogenous application has been reported by many researchers in GB non-accumulating plants such as tomato (Makela et al 1998), and rape (Sulpice et al 2002) grown under stressful environment. The role of exogenous GB in increasing leaf endogenous concentration in GB accumulators is however, controversial.…”

Section: Discussionmentioning

confidence: 94%

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Modulation of endogenous levels of some key organic metabolites by exogenous application of glycine betaine in drought stressed plants of sunflower (Helianthus annuus L.)

Iqbal

Ashraf

2010

Plant Growth Regul

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The present study was conducted to examine the changes in some key metabolites in drought-stressed sunflower plants supplied with glycine betaine externally. Imposition of drought stress at the vegetative or reproductive growth stages decreased the plant dry matter production and increased the accumulation of organic solutes (glycine betaine, proline, soluble proteins, free amino acids and soluble sugars) in two sunflower lines, i.e., Glushan-98 and Suncross. In general, decrease in dry matter production and increase in the endogenous levels of organic solutes, were more pronounced when drought stress applied at the vegetative stage than at the reproductive stage. Glycine betaine applied as a pre-sowing seed treatment was not found to be effective in reducing the negative effects of drought stress in sunflower plants. Foliar application of GB further enhanced the leaf endogenous levels of GB, soluble proteins and total soluble sugars in drought stressed plants without exerting any negative effects on other osmotica. However, this GB-induced increase in endogenous levels of organic solutes was found to be not associated with plant dry matter production under stress conditions.

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Section: Discussionmentioning

confidence: 60%

Section: Discussionmentioning

confidence: 79%

Section: Discussionmentioning

confidence: 94%

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Modulation of endogenous levels of some key organic metabolites by exogenous application of glycine betaine in drought stressed plants of sunflower (Helianthus annuus L.)

Iqbal

Ashraf

2010

Plant Growth Regul

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“…Yang and Lu (2006) concluded that if endogenous level of GB reaches a threshold level due to either foliar application of high concentrations of GB or by increasing the number of foliar applications of effective concentration, or applied through the rooting medium for a longer duration even at low concentration, it does not act as an osmoregulator substances, thereby causing phytotoxicity. In this respect, Sulpice et al (2002) found that enhanced endogenous GB due to exogenous GB application at high doses caused the damaging effects in Brassica napus. Kotb and Mansour (2012) concluded that GB acted as osmoregulating substance and enhanced water stress tolerance of maize plant when applied at a level of 15 mM , whereas, 20 mM GB decreased growth and yield of maize.…”

Section: Effective Doses Of Gbmentioning

confidence: 99%

Influence of osmoregulators on plant tolerance to water stress

2016

Sci. Agric

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CitationDawood MG. 2016. Influence of osmoregulators on plant tolerance to water stress, 13 (1), 42-58. Retrieved from www.pscipub.com (DOI: 10.15192/PSCP. SA.2016.13.1.4258) This article highlights on some recent researches, which studied the impact of osmoregulator compounds and their application on the plant in order to increase the plant tolerance to water stress. Water stress limits the growth, productivity and quality of agricultural crops in the world. Water Stress is not only due to the scarcity of water but also due other factors such as salinity, high temperatures and severe cold that make plants not able to absorb enough water from soil to grow well and this is called physiological drought that leads to a series of disorders in physiological and biochemical processes mainly due to lack of osmotic (internal water content of the plant deficiency), and the toxicity of salt ions. One way to overcome the negative impact of water stress on plants is the use of osmoregulators compounds formed by the plant when exposed to stress such as glycinebetaine, proline and trehalose. Osmoregulator compounds mainly regulate osmotic pressure within the plant to be able to absorb water and also have influential and effective roles on a lot of vital processes in the plant. they protect membranes of chloroplasts and thus increase the photosynthesis efficiency and have the ability to protect cell walls and membranes, which leads to stability and the organization of permeability and play an important role in scavenging the free radicals thus lead to mitigate the adverse impact of stress and improve growth, productivity and quality of plants. It can be concluded from this article that the best material used to increase plant tolerance to water stress is glycinebetaine where it can be obtained in large quantities and at low prices, making use it appropriately in economic terms as well as effective impact on increasing the tolerance of plants to water stress and reflected in increasing crop quantity and quality. Moreover, the use of proline has also an influential and effective role in increasing plant tolerance to water stress, but more expensive than glycinebetaine. Trehalose is an efficient protectant against water deficit conditions, and it is also effective in reducing oxidative stress but trehalose considered the most expensive, until now. We must intensify efforts to study and understand more of the physiological and biochemical changes played by these substances within the plant under stress conditions to improve plant productivity under water stress with modest economic cost.

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“…It might also result from their noncompatibility in transgenic types. Compatibility of these substances seems indeed to be restricted to the wild genotypes that naturally produce them (Gibon et al, 1997;Romero et al, 1997;Sulpice et al, 1998Sulpice et al, , 2002Bohnert and Shen, 1999;Hare et al, 2002).…”

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confidence: 99%

A Reassessment of the Function of the So-Called Compatible Solutes in the Halophytic Plumbaginaceae Limonium latifolium

et al. 2007

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The compatible solute hypothesis posits that maintaining osmotic equilibrium under conditions of high salinity requires synthesis of organic compounds, uptake of potassium ions, and partial exclusion of NaCl. To assess whether osmotic adaptation in Limonium latifolium proceeds according to this hypothesis, a comprehensive analysis of solute accumulation during NaCl treatments was conducted. Determination of prevailing inorganic ions and establishment of the metabolic profiles for low M r organic substances revealed that contrary to the mentioned hypothesis the major contributors to osmolarity were constituted by inorganic solutes. Independent of salinity, only 25% of this osmolarity resulted from organic solutes such as Suc and hexoses. Proline (Pro), b-alanine betaine, and choline-O-sulfate were minor contributors to osmolarity. Compatible inositols also occurred, especially chiro-inositol, characterized for the first time in this species, to our knowledge. Principal component analysis showed that only a limited number of metabolic reconfigurations occurred in response to dynamic changes in salinity. Under such conditions only sugars, chiro-inositol, and Pro behave as active osmobalancers. Analysis of metabolic profiles during acclimatization to either mild salinity or nonsaline conditions showed that organic solute accumulation is predominantly controlled by constitutive developmental programs, some of which might be slightly modulated by salinity. Osmolarity provided under such conditions can be sufficient to maintain turgor in salinized seedlings. Compartmental analysis of Pro and b-alanine betaine in leaf tissues demonstrated that these solutes, mainly located in vacuoles under nonsaline conditions, could be partly directed to the cytosol in response to salinization. Thus they did not conform with the predictions of the compatible solute hypothesis.Due to either water loss or induced processes responsible for enhancement of the total number of osmotically active particles, higher plants are able to increase their osmolarity in response to hyperosmotic conditions. Accumulation of such particles, collectively termed osmolytes, contributes to osmotic adjustment (OA), which is needed for survival and resuming of growth at after-stress recovery. Active OA has been recognized as one of the key determinants of tolerance to salinity and other osmotic stresses encountered by higher plants (Jamaux et al., 1997). Inorganic and/or organic solutes could be involved in such function and depending on their origin, their production is associated with different energetic requirements partly responsible for inhibitory effects on growth rate. It is widely believed that osmolytes do not exert, per se, damaging effects on cell compartments where they are located.Primarily OA could be achieved with ions such as K 1 , Na 1 , NO 3 2 , or Cl 2 when available in the root environment (Shabala and Lew, 2002) through stressinduced activation of uptake and translocation of these substances. At the cellular level further accumulation of ...

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Interaction between exogenous glycine betaine and the photorespiratory pathway in canola leaf discs

Cited by 18 publications

References 43 publications

Modulation of endogenous levels of some key organic metabolites by exogenous application of glycine betaine in drought stressed plants of sunflower (Helianthus annuus L.)

Modulation of endogenous levels of some key organic metabolites by exogenous application of glycine betaine in drought stressed plants of sunflower (Helianthus annuus L.)

Influence of osmoregulators on plant tolerance to water stress

A Reassessment of the Function of the So-Called Compatible Solutes in the Halophytic Plumbaginaceae Limonium latifolium

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