Membrane Thermostability and Heat Tolerance of Spring Wheat

Shanahan, John F.; Edwards, Ian B.; Quick, J. S.; Fenwick, Jack

doi:10.2135/cropsci1990.0011183x003000020001x

Cited by 112 publications

(64 citation statements)

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“…However, yield and its related parameters in stress environments are mainly effective to evaluate stress. The cell membrane thermostability (CMT) method on flag leaves of fieldgrown plants resulted in thermo tolerant lines, resulting in a significant spring wheat yield increase (Shanahan et al, 1990). They also concluded that the cell membrane thermostability test is a useful screening procedure to select heat-tolerant spring wheat genotypes.…”

Section: Discussionmentioning

confidence: 99%

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Genetic Analysis of Relative Cell Injury Percentage and Some Yield Contributing Traits in Wheat Under Nomral and Heat Stress Conditions

Farooq

Khaliq

Kashif

et al. 2011

Chilean J. Agric. Res.

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Several wheat genotypes were screened against heat stress. Seven wheat (Triticum aestivum L.) cultivars obtained after screening against heat classified as tolerant, moderately tolerant, and susceptible to heat stress, were mated in a complete diallel mating system to study the inheritance pattern of relative cell injury percentage (cell injury %) and some yield contributing parameters under normal and heat stress conditions. Significant genotypic differences were found (P < 0.01) for all the studied traits under both regimes. The scaling test disclosed partial adequacy for traits such as days to heading and days to maturity, but for flag leaf area and relative cell injury %, it showed full sufficiency under both environments. The model for grain yield per plant and biomass per plant were fully adequate under normal conditions, but partially adequate under stress. The harvest index showed partial adequacy under normal conditions, but was fully adequate under stress. The additive component of genotypic variation (D) was significant for all studied traits and more significant than the H 1 and H 2 dominance components. Values of the gene proportion with positive and negative effects in the parents (H 2 /4H 1 ) demonstrated an unequal distribution of dominant genes in the parents for almost all the traits except for flag leaf area, grain yield per plant, and harvest index which showed an equal distribution of dominant genes under stress conditions. High heritability estimates were found for days to heading, days to maturity, flag leaf area, grain yield, and relative cell injury percentage under both regimes. Moderately high estimates were found for biomass per plant and harvest index.

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Section: Discussionmentioning

confidence: 99%

“…At anthesis, flag leaves of 10 randomly selected plants were taken from field-grown plants to study the electrolyte leakage from leaves with a conductivity meter according to the technique used by Shanahan et al (1990). Samples were rinsed twice with deionized water to remove surface contamination and then blotted dry.…”

Section: Methodsmentioning

confidence: 99%

Genetic Analysis of Relative Cell Injury Percentage and Some Yield Contributing Traits in Wheat Under Nomral and Heat Stress Conditions

Farooq

Khaliq

Kashif

et al. 2011

Chilean J. Agric. Res.

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“…Membrane stability was estimated by measuring the leakage of electrolytes (conductivity) according to Shanahan et al (1990). 1 g current-year needles was taken in 10 ml of double distilled water in glass vials and kept at 10°C for 24 h with shaking.…”

Section: Photosynthetic Parametersmentioning

confidence: 99%

Growth and physiological responses of Picea asperata seedlings to elevated temperature and to nitrogen fertilization

Zhao

Liu

2008

Acta Physiol Plant

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Picea asperata is a dominant species in the subalpine coniferous forests distributed in eastern edges of Tibetan Plateau and upper reaches of the Yangtze River. The paper mainly identified the short-term influences of experimental warming, nitrogen fertilization, and their combination on growth and physiological performances of Picea asperata seedlings. These seedlings were subjected to two levels of temperature (ambient; infrared heater warming) and two nitrogen levels (0; 25 g m -2 a -1 N) for 6 months. We used a free air temperature increase of overhead infrared heater to raise both air and soil temperature by 2.1 and 2.6°C, respectively. The temperature increment induced an obvious enhancement in biomass accumulation and the maximum net photosynthetic rate, and decreased AOS and MDA level under ambient nitrogen conditions. Whereas, negative effects of experimental warming on growth and physiology was observed under nitrogen fertilization condition. On the other hand, nitrogen fertilization significantly improved plant growth in unwarmed plots, by stimulating total biomass, maximum net photosynthetic rate (A max ), antioxidant compounds, as well as reducing the content of AOS and MDA. However, in warmed plots, nitrogen addition clearly decreased A max , antioxidant compounds, and induced higher accumulation of AOS and MDA. Obviously, the beneficial effects of sole nitrogen on growth and physiology of Picea asperata seedlings could not be magnified by artificial warming.

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“…To generate data for calculating Id, the standard procedure is to remove appropriate samples of plant tissue, bring the samples to full hydration, rinse off surface adhering electrolytes and contents of cells damaged by excision, and then impose an environmental stress such as dehydration (1,5,7,12,19), high temperature (8,13,18,21,25), or low temperature (2-4, 9, 23, 27, 28). The assumption is that it is necessary to stress tissue in vitro to elicit differences among samples.…”

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confidence: 99%

An Improved Method for Using Electrolyte Leakage to Assess Membrane Competence in Plant Tissues

Whitlow¹,

Bassuk²,

Ranney³

et al. 1992

Plant Physiol.

128

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A new expression for ion leakage from plant tissue, the tissue ionic conductance (gT), is compared with electrical conductivity (EC) and a commonly used damage index (Id) to test the ability of each expression to correctly describe leakiness in two model systems representing examples of physiological processes with well-known effects on membrane permeability. In experiments in which drought-acclimated leaves were compared with nonacclimated leaves and senescing leaves were compared with nonsenescing leaves, Id contradicted our expectation that acclimated tissue would be less leaky than nonacclimated tissue, and gT1and EC confirmed this expectation. In a comparison of senescing and nonsenescing tissue, Id again contradicted our expectation that senescing tissue would be more leaky than nonsenescing, and EC and gT, were confirming. Using a diffusion analysis approach, we show that Id fails to account for variation in the concentration gradient between the tissue and the bathing solution and variation in the surface area through which efflux occurs. Furthermore, because Id is a parameter that relates treatment performance to control performance as a percentage value, it distorts the actual differences among treatments. The resulting artifacts lead to a presentation of membrane integrity which is probably incorrect.EC is a more direct measurement of net ion efflux and appears to be less vulnerable to artifact. However, because gTi is the only expression that explicitly includes chemical driving force and tissue surface area, it is the most reliable of the three expressions.Measuring solute leakage from plant tissue is a long-standing method for estimating membrane permeability in relation to environmental stresses, growth and development, and genotypic variation. Early published accounts used total electrolyte leakage, expressed as specific conductance (EC2) of the aqueous bathing solution in which the tissue was immersed, to indicate degree of damage resulting from chilling injury (3,4)

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Membrane Thermostability and Heat Tolerance of Spring Wheat

Cited by 112 publications

References 0 publications

Genetic Analysis of Relative Cell Injury Percentage and Some Yield Contributing Traits in Wheat Under Nomral and Heat Stress Conditions

Genetic Analysis of Relative Cell Injury Percentage and Some Yield Contributing Traits in Wheat Under Nomral and Heat Stress Conditions

Growth and physiological responses of Picea asperata seedlings to elevated temperature and to nitrogen fertilization

An Improved Method for Using Electrolyte Leakage to Assess Membrane Competence in Plant Tissues

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