The contribution of ear photosynthesis to grain filling in bread wheat (Triticum aestivum L.)

Maydup, María Luján; Antonietta, Mariana; Guiamet, Juan José; Graciano, Corina; López, José R.; Tambussi, Eduardo Alberto

doi:10.1016/j.fcr.2010.06.014

Cited by 178 publications

(176 citation statements)

References 38 publications

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“…However, it was shown that the rate of ear photosynthesis can exceed that of the flag leaf, especially under water stress conditions [83,85]. Thus, under the observed moisture and phenological conditions, ears probably remain active for a longer time period and maintain a higher water content than flag leaves [84,86,87]. These studies give further reason to our findings on the suitability of ear temperatures to model turbulent fluxes during the observation period.…”

Section: Suitability Of Model-temperature Combinations To Predict Submentioning

confidence: 57%

“…For a winter wheat stand in China, [81] found that at an fAW below 50%, the plants experienced "water stress", and stomatal conductance (gc) was decreasing linearly with fAW. Reports on the overall contribution of ear activity differ [82][83][84]. However, it was shown that the rate of ear photosynthesis can exceed that of the flag leaf, especially under water stress conditions [83,85].…”

Section: Suitability Of Model-temperature Combinations To Predict Submentioning

confidence: 99%

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Diurnal Dynamics of Wheat Evapotranspiration Derived from Ground-Based Thermal Imagery

et al. 2014

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Abstract:The latent heat flux, one of the key components of the surface energy balance, can be inferred from remotely sensed thermal infrared data. However, discrepancies between modeled and observed evapotranspiration are large. Thermal cameras might provide a suitable tool for model evaluation under variable atmospheric conditions. Here, we evaluate the results from the Penman-Monteith, surface energy balance and Bowen ratio approaches, which estimate the diurnal course of latent heat fluxes at a ripe winter wheat stand using measured and modeled temperatures. Under overcast conditions, the models perform similarly, and radiometric image temperatures are linearly correlated with the inverted aerodynamic temperature. During clear sky conditions, the temperature of the wheat ear layer could be used to predict daytime turbulent fluxes (root mean squared error and mean absolute error: 20-35 W·m 9776Errors are dependent on the models' ability to simulate diurnal hysteresis effects and are largest during intermittent clouds, due to the discrepancy between the timing of image capture and the time needed for the leaf-air-temperature gradient to adapt to changes in solar radiation. During such periods, we suggest using modeled surface temperatures for temporal upscaling and the validation of image data.

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Section: Suitability Of Model-temperature Combinations To Predict Submentioning

confidence: 57%

Section: Suitability Of Model-temperature Combinations To Predict Submentioning

confidence: 99%

Diurnal Dynamics of Wheat Evapotranspiration Derived from Ground-Based Thermal Imagery

et al. 2014

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“…However, in the case of oilseed rape, the photosynthesis of the siliques contributes substantially to grain filling (Diepenbrock 2000), especially for the siliques in the top of the canopy (authors' observation). This is also true for wheat through ear photosynthesis (Maydup et al 2010;SanchezBragado et al 2016) or photosynthesis by the awns (Sanchez-Bragado et al 2016). Labra et al (2017) demonstrated that nitrogen plays a crucial role in the branching behavior of oilseed rape and in number of siliques and number of seeds per silique.…”

Section: Crop Duration In Relation To Nitrogen Demandmentioning

confidence: 99%

Diverse concepts of breeding for nitrogen use efficiency. A review

Bueren

Struik

2017

Agron. Sustain. Dev.

118

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Cropping systems require careful nitrogen (N) management to increase the sustainability of agricultural production. One important route towards enhanced sustainability is to increase nitrogen use efficiency. Improving nitrogen use efficiency encompasses increasing N uptake, N utilization efficiency, and N harvest index, each involving many crop physiological mechanisms and agronomic traits. Here, we review recent developments in cultural practices, cultivar choice, and breeding regarding nitrogen use efficiency. We add a comparative analysis of our own research on designing breeding strategies for nitrogen use efficiency in leafy and non-leafy vegetables, literature on breeding for nitrogen use efficiency in other vegetables (cabbage, cauliflower), and literature on breeding for nitrogen use efficiency in grain crops. We highlight traits that are generic across species, demonstrate how traits contributing to nitrogen use efficiency differ among crops, and show how cultural practice affects the relevance of these traits. Our review indicates that crops harvested in their early or late vegetative phase or reproductive phase differ in traits relevant to improve nitrogen use efficiency. Headforming crops (lettuce, cabbage) depend on the prolonged photosynthesis of outer leaves to provide the carbon sources for continued N supply and growth of the photosynthetically less active, younger inner leaves. Grain crops largely depend on prolonged N availability for uptake and on availability of N in stover for remobilization to the grains. Improving root performance is relevant for all crop types, but especially shortcycle vegetable crops benefit from early below-ground vigor. We conclude that there is sufficient genetic variation available among modern cultivars to further improve nitrogen use efficiency but that it requires integration of agronomy, crop physiology, and efficient selection strategies to make rapid progress in breeding. We also conclude that discriminative traits related to nitrogen use efficiency better express themselves under low input than under high input. However, testing under both low and high input can yield cultivars that are adapted to low-input conditions but also respond to high-input conditions. The benefits of increased nitrogen use efficiency through breeding are potentially large but realizing these benefits is challenged by the huge genotype-byenvironment interaction and the complex behavior of nitrogen in the cropping system.

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“…During the reproductive phase (post-heading), a significant portion of photosynthesis is performed by the constituents of the oat panicle (JENNINGS; SHIBLES, 1968) or wheat ear (MAYDUP et al, 2010). In addition to the contribution of photosynthesis, the translocation of photoassimilates accumulated during the growth should be also considered.…”

Section: Controlmentioning

confidence: 99%

“…In environments with high interspecific interaction, agronomic practices that improve the photosynthesis performed in the reproductive structure should be valued (e.g., morphological traits: JENNINGS; SHIBLES 1968;MAYDUP et al, 2010). During grain L. Deiss et al filling, the mobilization of the photosynthate produced by panicle constituents affects the grain quality (BROWNE; WHITE; BURKE, 2006).…”

Section: Controlmentioning

confidence: 99%

Oat growth under different nitrogen doses in eucalyptus alley cropping system in subtropical Brazil

Deiss¹,

Moraes²,

Pelissari³

et al. 2014

Rev. Ciênc. Agron.

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-Plant growth analysis was performed to determine how oat (Avena sativa L. cv. IPR 126) cultivated for grain responds to the eucalyptus (Eucalyptus dunnii Maiden) alley cropping system (ACS) in subtropical Brazil. The hypothesis of this work was that oat growth response is not modified by nitrogen at distances relative to 4 year old eucalyptus tracks in the ACS. The objective of this study was to determine how the oat growth was influenced by nitrogen doses (12 and 80 kg N ha RESUMO -Foi realizada uma análise de crescimento para verificar como a aveia (Avena sativa L. cv. IPR 126) cultivada para grãos responde a um sistema agroflorestal (SAF) com eucaliptos (Eucalyptus dunnii Maiden) no subtrópico brasileiro. A hipótese deste trabalho é que a resposta de crescimento da aveia não é modificada pelo nitrogênio em distâncias relativas a faixas de eucaliptos. O objetivo deste estudo foi determinar como o crescimento da aveia é influenciado por níveis de nitrogênio (12 e 80 kg ha -1 de N) em cinco posições equidistantes entre faixas de linhas duplas de eucaliptos [20 m (4 m x 3 m)] em SAF e em agricultura tradicional de plantio direto. O experimento foi em faixas no delineamento de blocos ao acaso com quatro repetições. Foram avaliadas as taxas de crescimento relativo e de assimilação líquida, fração de massa foliar e taxa de enchimento relativo da panícula. O nitrogênio alterou a resposta do crescimento diferentemente em posições relativas às faixas de árvores, portanto diferentes doses de nitrogênio devem ser utilizadas nestas posições para aumentar o crescimento da aveia.Palavras-chave: Avena sativa. Eucalyptus dunnii. Sistemas integrados agropecuários. Análise do crescimento. Sistema agroflorestal.

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The contribution of ear photosynthesis to grain filling in bread wheat (Triticum aestivum L.)

Cited by 178 publications

References 38 publications

Diurnal Dynamics of Wheat Evapotranspiration Derived from Ground-Based Thermal Imagery

Diurnal Dynamics of Wheat Evapotranspiration Derived from Ground-Based Thermal Imagery

Diverse concepts of breeding for nitrogen use efficiency. A review

Oat growth under different nitrogen doses in eucalyptus alley cropping system in subtropical Brazil

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