Evaluation of <i>Lophopyrum elongatum</i> as a source of genetic diversity to increase the waterlogging tolerance of hexaploid wheat (<i>Triticum aestivum</i>)

McDonald, Michael P.; Galwey, Nicholas; Ellneskog‐Staam, Pernilla; Colmer, Timothy D.

doi:10.1046/j.1469-8137.2001.00183.x

Cited by 43 publications

(23 citation statements)

References 44 publications

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“…The seeds were placed on sterile wet tissue paper in Petri dish to germinate. The germinated seed was transferred to N-free nutrient solution (McDonald et al, 2001) to grow for 10 days. The rice seedlings were then inoculated by immersing the rice roots in 9×10 8 cells/ml bacterial suspension in 0.85 % NaCl for 60 min.…”

Section: Effect Of Nitrogen Fixing Bacteria On Ricementioning

confidence: 99%

Screening of Nitrogen Fixing Endophytic Bacteria in Oryza sativa L.

Hongrittipun¹,

Youpensuk²,

Rerkasem³

2014

JAS

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Nitrogen (N) is an essential element for the growth and yield of rice. Some endophytic bacteria can fix N 2 from the air and convert to nitrogen compounds that can be utilized by plants. In this study, endophytic bacteria were isolated from one-month-old seedlings of five rice (Oryza sativa L.) varieties (Muey Nong 24, Muey Nong 25, Pathum Thani 1, Suphan Buri 1 and Chai Nat 1) growing without nitrogen fertilizer in the farmers' field. One hundred and twenty-three isolates of endophytic bacteria were obtained from the roots, stems and leaves of these rice varieties. Nitrogenase activity of the bacteria in N-free culture medium was determined by acetylene reduction assay. Seven isolates of the bacteria with highest nitrogenase activity were identified by phylogenetic analysis of the 16S rRNA genes, and found to belong to Burkholderia cepacia (CS5), Citrobacter sp.

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Section: Effect Of Nitrogen Fixing Bacteria On Ricementioning

confidence: 99%

Screening of Nitrogen Fixing Endophytic Bacteria in Oryza sativa L.

Hongrittipun¹,

Youpensuk²,

Rerkasem³

2014

JAS

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“…Excised tips were 'healed' for 5 h in hypoxic (0.020 mM O 2 ) nutrient solution (10 or 400 mM NaCl) that also contained 20 mM glucose and 10 mg L −1 carbenicillin. Root tips were then incubated in anoxic nutrient solution (10 or 400 mM −3 NaCl) that also contained 20 mM glucose and 10 mg L −1 carbenicillin, in sealed glass vials for 2 h as described in McDonald et al (2001). Ethanol in the incubation solution and neutralised perchloric acid extracts of the root tips was assayed using the enzymatic technique of Beutler (1983).…”

Section: Analyses Of Tissue Solutesmentioning

confidence: 99%

Salinity and waterlogging tolerances in three stem-succulent halophytes (Tecticornia species) from the margins of ephemeral salt lakes

English

Colmer

2011

Plant Soil

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Background and aims Tecticornia species are stemsucculent, perennial halophytes (sub-family Salicornioideae; Chenopodiaceae) that inhabit saline areas including the margins of ephemeral salt lakes in Australia. Based on zonation observed at salt lakes, species were hypothesised to differ in tolerances to salinity and/or waterlogging. Methods Three Tecticornia species were grown in sub-irrigated or waterlogged sand culture with treatments from 10 to 800 mM NaCl, for 60 d in a glasshouse. Growth, tissue solutes, root porosity, root radial O 2 loss, and ethanol production, were assessed. Results The three species were salt tolerant; at 800 mM NaCl shoot RGR (ash-free) was reduced by 9% in T. indica, 22% in T. pergranulata and 39% in T. mellaria. Na + and Cl − were the predominant osmotica in succulent stem tissues. Glycinebetaine was a major organic solute. T. pergranulata and T. indica were waterlogging tolerant; shoot RGR was reduced by at most 29% irrespective of salinity. Waterlogging tolerance in T. mellaria was variable (shoot RGR 8%-56% of controls) and some individuals died. T. pergranulata formed adventitious roots with aerenchyma, but the two other species did not. Anoxic tips of lateral roots produced ethanol. Conclusion The three Tecticornia species are salt tolerant. T. pergranulata is also waterlogging tolerant and formed adventitious roots containing aerenchyma, traits consistent with growth on mud flats of salt lakes. T. indica was unexpectedly tolerant of waterlogging, whereas T. mellaria was less tolerant. Future work is needed to evaluate tolerances of inundation (i.e. submergence) and to higher salinity treatments.

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“…Another approach to pinpoint the genes or chromosomal regions that control flood tolerance is the use of crosses between waterlogging-tolerant and less tolerant species, cultivars or ecotypes. In this way a group of hybrids may be developed that encompass a wide variety in root traits such as aerenchyma content, radial oxygen loss or adventitious root formation (McDonald et al, 2001b;Colmer 2003). If genetic markers are made available for these species, QTL analysis may reveal the area on the genome where genes crucial for the expression of these traits are located.…”

Section: Summary and Perspectivesmentioning

confidence: 99%

Acclimation to soil flooding — sensing and signal-transduction

Visser

Voesenek

2005

Plant Ecophysiology

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Flooding results in major changes in the soil environment. The slow diffusion rate of gases in water limits the oxygen supply, which affects aerobic root respiration as well as many (bio)geochemical processes in the soil. Plants from habitats subject to flooding have developed several ways to acclimate to these growth-inhibiting conditions, ranging from pathways that enable anaerobic metabolism to specific morphological and anatomical structures that prevent oxygen shortage. In order to acclimate in a timely manner, it is crucial that a flooding event is accurately sensed by the plant. Sensing may largely occur in two ways: by the decrease of oxygen concentration, and by an increase in ethylene. Although ethylene sensing is now well understood, progress in unraveling the sensing of oxygen has been made only recently. With respect to the signal-transduction pathways, two types of acclimation have received most attention. Aerenchyma formation, to promote gas diffusion through the roots, seems largely under control of ethylene, whereas adventitious root development appears to be induced by an interaction between ethylene and auxin. Parts of these pathways have been described for a range of species, but a complete overview is not yet available. The use of molecular-genetic approaches may fill the gaps in our knowledge, but a lack of suitable model species may hamper further progress.

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Evaluation of Lophopyrum elongatum as a source of genetic diversity to increase the waterlogging tolerance of hexaploid wheat (Triticum aestivum)

Cited by 43 publications

References 44 publications

Screening of Nitrogen Fixing Endophytic Bacteria in Oryza sativa L.

Screening of Nitrogen Fixing Endophytic Bacteria in Oryza sativa L.

Salinity and waterlogging tolerances in three stem-succulent halophytes (Tecticornia species) from the margins of ephemeral salt lakes

Acclimation to soil flooding — sensing and signal-transduction

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