The Experts below are selected from a list of 133686 Experts worldwide ranked by ideXlab platform
Chaonian Feng - One of the best experts on this subject based on the ideXlab platform.
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effect of Nitrogen Levels and Nitrogen ratios on lodging resistance and yield potential of winter wheat triticum aestivum l
PLOS ONE, 2017Co-Authors: Mingwei Zhang, Hui Wang, Yuan Yi, Jinfeng Ding, Chunyan Li, Chaonian FengAbstract:: Lodging is one of the constraints that limit wheat yields and quality due to the unexpected bending or breaking stems on wheat (Triticum aestivum L.) production worldwide. In addition to choosing lodging resistance varieties, husbandry practices also have a significant effect on lodging. Nitrogen management is one of the most common and efficient methods. A field experiment with Yangmai 20 as research material (a widely-used variety) was conducted to study the effects of different Nitrogen Levels and ratios on culm morphological, anatomical characters and chemical components and to explore the Nitrogen application techniques for lodging tolerance and high yield. Results showed that some index of basal internodes, such as stem wall thickness, filling degree, lignin content, cellulose content, water-soluble carbohydrate (WSC) and WSC/N ratio, were positively and significantly correlated with culm lodging-resistant index (CLRI). As the increase of Nitrogen Level and basal Nitrogen ratio, the basal internodes became slender and fragile with the thick stem wall, while filling degree, chemical components and the strength of the stem decreased gradually, which significantly increased the lodging risk. The response of grain yield to Nitrogen doses was quadratic and grain yield reached the highest at the Nitrogen ratio of 50%:10%:20%:20% (the ratio of Nitrogen amount applied before sowing, at tillering stage, jointing stage and booting stage respectively, abbreviated as 5:1:2:2). These results suggested that for Yangmai 20, the planting density of 180×104ha-1, Nitrogen Level of 225 kg ha-1, and the ratio of 5: 1: 2: 2 effectively increased lodging resistance and grain yield. This combination of planting density and Nitrogen Level and ratio could effectively relieve the contradiction between high-yielding and anti-lodging.
François Balfourier - One of the best experts on this subject based on the ideXlab platform.
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Genomic regions associated with the Nitrogen limitation response revealed in a global wheat core collection
Theoretical and Applied Genetics, 2013Co-Authors: Jacques Bordes, Olivier Gardet, B. Duperrier, J. P. Jaubertie, A. L. Pissavy, Emmanuel Heumez, Gilles Charmet, Catherine Grand Ravel, Jacques Le Gouis, François BalfourierAbstract:Modern wheat (Triticum aestivum L.) varieties in Western Europe have mainly been bred, and selected in conditions where high Levels of Nitrogen-rich fertilizer are applied. However, high input crop management has greatly increased the risk of nitrates leaching into groundwater with negative impacts on the environment. To investigate wheat Nitrogen tolerance characteristics that could be adapted to low input crop management, we supplied 196 accessions of a wheat core collection of old and modern cultivars with high or moderate amounts of Nitrogen fertilizer in an experimental network consisting of three sites and 2 years. The main breeding traits were assessed including grain yield and grain protein content. The response to Nitrogen Level was estimated for grain yield and grain number per m(2) using both the difference and the ratio between performance at the two input Levels and the slope of joint regression. A large variability was observed for all the traits studied and the response to Nitrogen Level. Whole genome association mapping was carried out using 899 molecular markers taking into account the five ancestral group structure of the collection. We identified 54 main regions involving almost all chromosomes that influence yield and its components, plant height, heading date and grain protein concentration. Twenty-three regions, including several genes, spread over 16 chromosomes were involved in the response to Nitrogen Level. These chromosomal regions may be good candidates to be used in breeding programs to improve the performance of wheat varieties at moderate Nitrogen input Levels.
Mingwei Zhang - One of the best experts on this subject based on the ideXlab platform.
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effect of Nitrogen Levels and Nitrogen ratios on lodging resistance and yield potential of winter wheat triticum aestivum l
PLOS ONE, 2017Co-Authors: Mingwei Zhang, Hui Wang, Yuan Yi, Jinfeng Ding, Chunyan Li, Chaonian FengAbstract:: Lodging is one of the constraints that limit wheat yields and quality due to the unexpected bending or breaking stems on wheat (Triticum aestivum L.) production worldwide. In addition to choosing lodging resistance varieties, husbandry practices also have a significant effect on lodging. Nitrogen management is one of the most common and efficient methods. A field experiment with Yangmai 20 as research material (a widely-used variety) was conducted to study the effects of different Nitrogen Levels and ratios on culm morphological, anatomical characters and chemical components and to explore the Nitrogen application techniques for lodging tolerance and high yield. Results showed that some index of basal internodes, such as stem wall thickness, filling degree, lignin content, cellulose content, water-soluble carbohydrate (WSC) and WSC/N ratio, were positively and significantly correlated with culm lodging-resistant index (CLRI). As the increase of Nitrogen Level and basal Nitrogen ratio, the basal internodes became slender and fragile with the thick stem wall, while filling degree, chemical components and the strength of the stem decreased gradually, which significantly increased the lodging risk. The response of grain yield to Nitrogen doses was quadratic and grain yield reached the highest at the Nitrogen ratio of 50%:10%:20%:20% (the ratio of Nitrogen amount applied before sowing, at tillering stage, jointing stage and booting stage respectively, abbreviated as 5:1:2:2). These results suggested that for Yangmai 20, the planting density of 180×104ha-1, Nitrogen Level of 225 kg ha-1, and the ratio of 5: 1: 2: 2 effectively increased lodging resistance and grain yield. This combination of planting density and Nitrogen Level and ratio could effectively relieve the contradiction between high-yielding and anti-lodging.
Jacques Bordes - One of the best experts on this subject based on the ideXlab platform.
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Genomic regions associated with the Nitrogen limitation response revealed in a global wheat core collection
Theoretical and Applied Genetics, 2013Co-Authors: Jacques Bordes, Olivier Gardet, B. Duperrier, J. P. Jaubertie, A. L. Pissavy, Emmanuel Heumez, Gilles Charmet, Catherine Grand Ravel, Jacques Le Gouis, François BalfourierAbstract:Modern wheat (Triticum aestivum L.) varieties in Western Europe have mainly been bred, and selected in conditions where high Levels of Nitrogen-rich fertilizer are applied. However, high input crop management has greatly increased the risk of nitrates leaching into groundwater with negative impacts on the environment. To investigate wheat Nitrogen tolerance characteristics that could be adapted to low input crop management, we supplied 196 accessions of a wheat core collection of old and modern cultivars with high or moderate amounts of Nitrogen fertilizer in an experimental network consisting of three sites and 2 years. The main breeding traits were assessed including grain yield and grain protein content. The response to Nitrogen Level was estimated for grain yield and grain number per m(2) using both the difference and the ratio between performance at the two input Levels and the slope of joint regression. A large variability was observed for all the traits studied and the response to Nitrogen Level. Whole genome association mapping was carried out using 899 molecular markers taking into account the five ancestral group structure of the collection. We identified 54 main regions involving almost all chromosomes that influence yield and its components, plant height, heading date and grain protein concentration. Twenty-three regions, including several genes, spread over 16 chromosomes were involved in the response to Nitrogen Level. These chromosomal regions may be good candidates to be used in breeding programs to improve the performance of wheat varieties at moderate Nitrogen input Levels.
Jinfeng Ding - One of the best experts on this subject based on the ideXlab platform.
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effect of Nitrogen Levels and Nitrogen ratios on lodging resistance and yield potential of winter wheat triticum aestivum l
PLOS ONE, 2017Co-Authors: Mingwei Zhang, Hui Wang, Yuan Yi, Jinfeng Ding, Chunyan Li, Chaonian FengAbstract:: Lodging is one of the constraints that limit wheat yields and quality due to the unexpected bending or breaking stems on wheat (Triticum aestivum L.) production worldwide. In addition to choosing lodging resistance varieties, husbandry practices also have a significant effect on lodging. Nitrogen management is one of the most common and efficient methods. A field experiment with Yangmai 20 as research material (a widely-used variety) was conducted to study the effects of different Nitrogen Levels and ratios on culm morphological, anatomical characters and chemical components and to explore the Nitrogen application techniques for lodging tolerance and high yield. Results showed that some index of basal internodes, such as stem wall thickness, filling degree, lignin content, cellulose content, water-soluble carbohydrate (WSC) and WSC/N ratio, were positively and significantly correlated with culm lodging-resistant index (CLRI). As the increase of Nitrogen Level and basal Nitrogen ratio, the basal internodes became slender and fragile with the thick stem wall, while filling degree, chemical components and the strength of the stem decreased gradually, which significantly increased the lodging risk. The response of grain yield to Nitrogen doses was quadratic and grain yield reached the highest at the Nitrogen ratio of 50%:10%:20%:20% (the ratio of Nitrogen amount applied before sowing, at tillering stage, jointing stage and booting stage respectively, abbreviated as 5:1:2:2). These results suggested that for Yangmai 20, the planting density of 180×104ha-1, Nitrogen Level of 225 kg ha-1, and the ratio of 5: 1: 2: 2 effectively increased lodging resistance and grain yield. This combination of planting density and Nitrogen Level and ratio could effectively relieve the contradiction between high-yielding and anti-lodging.