Evolution and Metabolic Engineering of Osmoprotectant Accumulation in Higher Plants

Hanson, Andrew D.; Burnet, Michael

doi:10.1007/978-3-642-79133-8_17

Cited by 30 publications

(11 citation statements)

References 42 publications

(24 reference statements)

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“…We infer that Pro and GB accumulation in G 8 might MDA content (nmol g -1 FW) have a role in its salt tolerance. Several reports on different crops are in conformity with these results (Hanson and Burnet 1994;Dubey 1997;Mansour 2000;Ashraf and Harris 2004;Mansour et al 2005;Khan et al 2007;Siddiqui et al 2008). Data revealed that NR activity in Brassica genotypes was inhibited by salt stress (Table 1).…”

Section: Resultssupporting

confidence: 66%

Morphological and physio-biochemical characterization ofBrassica junceaL. Czern. & Coss. genotypes under salt stress

Siddiqui

Mohammad

Khan

2009

Journal of Plant Interactions

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Soil salinity is one of the major factors responsible for the low productivity of crop plants and has become an increasing threat for agriculture. In this context, the selection of tolerant genotype/s may be one of the remedies. Keeping this in view, the effect of NaCl (0Á120 mM) stress on shoot length (SL) plant , stomatal conductance (g s ), net photosynthetic rate (P N ), total chlorophyll (Chl) content, malondialdehyde (MDA) content, sensitivity rate index (SRI), leafnitrogen (N), potassium (K) and sodium (Na) content, leaf-K/Na ratio, nitrate reductase (NR: EC.1.6.6.1) and ATP-sulphurylase (ATP-S: EC.2.7.7.4) activities and proline (Pro) and glycinebetaine (GB) content of ten genotypes of Brassica juncea L. was studied at 55 and 65 days after sowing (DAS). NaCl treatments decreased all the above parameters, except Pro, GB, MDA, Na and SRI at both stages. Salt stress resulted in accumulation of Pro and GB, in all genotypes. The magnitude of increase in both osmolytes (Pro and GB) was higher in genotype G 8 than the other genotypes. Salt stress increased MDA and Na content while it decreased Chl, N and K content and K/Na ratio, Chl content, NR and ATP-S activities in all genotypes. But the magnitude of increase in MDA and Na content and decrease in SL plant(1 , A leaf (1 , LAI, P N , g s , Chl content and NR and ATP-S activities in genotype G 8 was more than that of other genotypes. These results suggest that the salt-tolerant genotype may have better osmotic adjustment and protection from free radicals by increasing the accumulation of Pro and GB content with overproduction of N and K and higher K/Na, NR and ATP-S activities under salinity stress.

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Section: Resultssupporting

confidence: 66%

Morphological and physio-biochemical characterization ofBrassica junceaL. Czern. & Coss. genotypes under salt stress

Siddiqui

Mohammad

Khan

2009

Journal of Plant Interactions

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“…Proline accumulation in higher plants under heavy metal stress has been reported by many workers (Alia and Saradhi 1991;Bassi and Sharma 1993a,b;Hanson and Burnet 1994;Ashraf and Harris 2004;Mansour et al 2005). Although also reported in algae (Wu et al 1998), there are few reports (including those of the authors) of the effect of heavy metal stress on proline content in cyanobacteria (Wu et al 1995;Choudhary et al 2007).…”

Section: Discussionmentioning

confidence: 84%

Impact of environmental pollution on cyanobacterial proline content

2007

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This study describes the toxic effects of different prominent aquatic pollutants-heavy metals (Cd & Pb), pesticides (alphamethrin and deltamethrin) and salt (NaCl)-on the intracellular proline content in the cyanobacterium, Westiellopsis prolifica-Janet strain-NCCU331. Despite a reduction in growth (measured as chlorophyll a content), the intracellular proline content increased in the presence of heavy metals, pesticides and high salt concentration. The intracellular cyanobacterial proline accumulation was more pronounced under salt stress than in the presence of pesticides and heavy metals. We have also compared whether or not anionic components influence heavy metal toxicity. It was found that the chlorides of Cd and Pb were more toxic than the NO 3 and the order of toxicity was CdCl 2 >PbCl 2 >Cd (NO 3 ) 2 >Pb (NO 3 ) 2 . Among pyrethroids, deltamethrin was more toxic than alphamethrin.

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“…Marcum and Murdoch [25] looked at the influence of salinity on the perennial ryegrass and found that with increased salinity, levels of proline and glycine betaine also increased. Proline is known to contribute to membrane stability [17] and mitigates the effect of NaCl on cell membrane disruption [24] . The results reported here for proline can be explained in view of some earlier reports that proline accumulation is one of the common characteristics in many plants under saline conditions [1,2] .…”

Section: ) Leaf Area Index Root Volume (Ml) -------------------------mentioning

confidence: 99%

Foliar and Soil Application of Potassium Nitrate Affects the Tolerance of Salinity and Canopy Growth of Perennial Ryegrass (Lolium perenne var Boulevard)

Tabatabaei¹,

Fakhrzad²

2008

American J. of Agricultural and Biological Sciences

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Abstract:Two experiments were conducted to determine the effect of KNO3 application on perennial ryegrass salinity tolerance. Two NaCl levels (0 and 60 mM) factorially combined with four KNO3 (KN) levels (0, 5, 10 and 15 mM) as the treatments. The KN was applied either to the soil or foliarly sprayed. The results showed that in both experiments the increased salinity significantly reduced the vegetative characteristics of ryegrass. In the salinity treatment, supplying KN at 10 mM concentraion increased the fresh and dry weight as well leaf area, however, the growth of the plants was lower at the 0 and 15 mM concentration of KN. The concentration of N, NO3, P and K was reduced in the salinity treatments, but the concentration of Na and Cl was increased. Salinity (NaCl60) significantly reduced the K/Na ratio, while it was increased when the KN was increased in the solution. The concentration of Cl was significantly reduced when KN increased in the solution so that its concentration in NaCl60 and 0 mM KN was 75% in soil and 66.6% in foliar sprays treatment, respectively, higher than that in NaCl60 and 15 mM treatment. Combination of both salinity and KN concentration remarkably increased the proline content. The concentration of chlorophyll was reduced in NaCl60 treatment however; additional supplying of KN increased the chlorophyll concentration. In NaCl60 treatment, the highest survival plants were observed at 10 mM KN as either foliar or soil application. It seems that the reduced Cl concentration, increased proline and K/Na ratio were the main reason for the improved tolerance for salinity of the perennial ryegrass in the 10 mM KN concentration.

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Evolution and Metabolic Engineering of Osmoprotectant Accumulation in Higher Plants

Cited by 30 publications

References 42 publications

Morphological and physio-biochemical characterization ofBrassica junceaL. Czern. & Coss. genotypes under salt stress

Morphological and physio-biochemical characterization ofBrassica junceaL. Czern. & Coss. genotypes under salt stress

Impact of environmental pollution on cyanobacterial proline content

Foliar and Soil Application of Potassium Nitrate Affects the Tolerance of Salinity and Canopy Growth of Perennial Ryegrass (Lolium perenne var Boulevard)

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