Differential Responses to High Temperatures of Starch and Nitrogen Accumulation in the Grain of Four Cultivars of Wheat

Bhullar, SS; Jenner, CF

doi:10.1071/pp9850363

Cited by 142 publications

(108 citation statements)

References 17 publications

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“…Lower grain weight and altered grain quality are the two reported manifestations of heat stress during the postanthesis grain-filling stage by affecting availability and translocation of photosynthates to the developing kernel, and starch synthesis and deposition within the kernel [99]. Wheat productivity is adversely affected by heat stress in arid, semiarid, tropical and subtropical regions of the world.…”

Section: Effect Of Heat Stress On Wheatmentioning

confidence: 99%

Impacts of Heat Stress on Wheat: A Critical Review

Iqbal¹,

Raja²,

Yasmeen³

et al. 2017

Adv Crop Sci Tech

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A brief review is given of investigations on stress-induced alterations in the yield of different biochemical contents in wheat. Wheat is major cereal crop for fulfilling the calories demands of growing population. Alterations in the worldwide climate are predicted to have critical sentence for crop production. Abiotic stresses such as heat and drought are major abiotic stresses restraining crop production. Heat stress reduces wheat growth by upsetting various physiological and biochemical processes and the developmental stage of the plant is critical in demonstrating the vulnerability of various species and cultivars subjected to high temperature. Heat stress did not affect the protein content but there is strong correlation between leaf nitrogen content and grain protein content. Induction of HSPs seems to be the universal response and adaptation to temperature stress. The synthesis of HSPs is believed to play significant role either in preventing or minimizing the adverse effects of high temperature both at molecular and cellular levels. Wheat has the tendency to adopt diverse types of responses to temperature stress as well as a heat shock by developing thermo-tolerance for the enhancement of the grain quality and yield.

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Section: Effect Of Heat Stress On Wheatmentioning

confidence: 99%

Impacts of Heat Stress on Wheat: A Critical Review

Iqbal¹,

Raja²,

Yasmeen³

et al. 2017

Adv Crop Sci Tech

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“…A temperature of 27°C at a slightly later developmental stage, 50% anthesis, also resulted in a high proportion of sterile florets [9]. Heat stress during grain filling, on the other hand, influences the translocation of photosynthetic assimilates, starch synthesis, and the accumulation of starch in the grains, thus causing changes in grain quality and weight [10]. High temperature was also reported to cause reductions in the weight of individual grains [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Productivity of a doubled haploid winter wheat population under heat stress

et al. 2012

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Breeding of new winter wheat cultivars with good heat tolerance requires better understanding of the genetic background of heat tolerance. In the present work the effect of heat stress on the 6 th day after heading was investigated in a doubled haploid (DH) population arising from a cross between heat-sensitive (Plainsman V) and heat-tolerant (Mv Magma) cultivars. Averaged over the population, heat stress was found to result in a significant reduction in biomass, grain yield and grain number per plant, and in thousand-kernel weight (TKW) and harvest index. High temperature had the greatest effect on the grain yield, with a drop of 36.2% compared with the control. This could be attributed jointly to significant reductions in the TKW of the main ear and in the grain number of the side tillers. The relationship between the yield parameters was confirmed by the positive correlations obtained for the lines in the population. The diverse levels of heat tolerance in the different lines were confirmed by the significant differences in the reduction in the chlorophyll content (SPAD index) of the flag-leaves and in yield parameters. The changes in yield components in stress condition, however, can be still the most effective tools for heat stress evaluation.

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“…High temperatures are usually accompanied by a strong negative correlation between oil and protein, bearing out their inverse relationship. To explain the negative correlation between starch and protein accumulation, Bullar and Jenner (1985) hypothesized that an increase in the proportion of grain nitrogen as a result of high temperature is due to suppression of starch synthesis rather than to a change in the quantity of nitrogen. Therefore, nitrogen accumulation in wheat is less sensitive to moderately high temperature than starch accumulation.…”

Section: Oil Protein and Glucosinolate Concentrationsmentioning

confidence: 99%

Canola response to high and moderately high temperature stresses during seed maturation

Aksouh-Harradj¹,

Campbell²,

Mailer³

2006

Can. J. Plant Sci.

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Aksouh-Harradj, N. M., Campbell, L. C. and Mailer, R. J. 2006. Canola response to high and moderately high temperature stresses during seed maturation. Can. J. Plant Sci. 86: 967-980. Canola is a valuable oilseed crop worldwide. Temperature during the post-anthesis period plays an important role in determining the final yield and seed composition. Experiments were conducted in climate-controlled growth cabinets to test the effect of two high temperature regimes following a 24-h acclimation period on three canola cultivars differing in their thermotolerance. A long, moderately high temperature treatment of 28°C/23°C (day/night) was applied for 10 d from 20 to 30 d after flowering (DAF) and a short, very high temperature regime of 28°C/23°C (day/night) including a peak of 38°C reached for 5 h around midday for 5 d from 25 to 29 DAF. Very high temperature for 5 d reduced yield on the main stem by up to 52% for a sensitive cultivar by reducing seed weight. This treatment also decreased the oil/protein ratio, but had a lesser effect on fatty acid composition. The moderately high temperature treatment for 10 d had only affected yield of one cultivar and increased the oil/protein ratio of all cultivars. However, it had a more pronounced effect on the fatty acid profile. A short period of very high temperature at a sensitive stage can be as critical to canola as mild temperature stress over a longer period.Key words: Brassica napus, oil, protein, fatty acids, tolerance, acclimation, heat stress Aksouh-Harradj, N. M., Campbell, L. C. and Mailer, R. J. 2006. L'effet de deux types de stress thermiques sur le canola pendant la période de reproduction. Can. J. Plant Sci. 86: 967-980. Le colza est une espèce importante de graine oléagineuse dans le monde. Cependant, la température pendant la période de reproduction joue un rôle important dans la détermination du rendement grainier et de la composition finale de la graine. Des expériences ont été entreprises dans des phytotrons pour examiner l'effet de deux types de stress thermiques suivant une journee d'acclimatation sur trois variétes de canola différant dans leur potentiel de tolérance à la chaleur. Un long régime modéré de 28°C/23°C (jour/nuit) a était appliqué pendant 10 jours (de 20 à 30 jours après la fleuraison) et un autre régime brèf a haute température de 28°C/23°C, jour/nuit comprenant une pic de 38°C atteint pendant 5 heures au milieu de la journée pendant 5 jours (de 25 à 29 jours après la fleuraison). La réaction des cultivars a différé selon les deux traitements. Le traitement élevé pendant 5 jours a réduit le rendement sur la tige principale de 52% pour le cultivar sensible en diminuant le poids des grains. Ce traitement a également diminué le rapport huile/proteins, par contre a eu peu d'effet sur la composition d'acides gras. Le traitement modéré pendant 10 jours d'autre part, a eu moins d'effet sur le rendement grainier, a accru le rapport d'huile/proteins, mais a eu cependant un effet plus prononcé sur la proportion d'acides gras. Une période courte de h...

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Differential Responses to High Temperatures of Starch and Nitrogen Accumulation in the Grain of Four Cultivars of Wheat

Cited by 142 publications

References 17 publications

Impacts of Heat Stress on Wheat: A Critical Review

Impacts of Heat Stress on Wheat: A Critical Review

Productivity of a doubled haploid winter wheat population under heat stress

Canola response to high and moderately high temperature stresses during seed maturation

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