The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform
Urs Schulthess - One of the best experts on this subject based on the ideXlab platform.
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Vernalization in wheat II. Genetic variability for the interchangeability of Plant Age and vernalization duration
Field Crops Research, 1995Co-Authors: Shi-ying Wang, Richard W. Ward, Joe T. Ritchie, R. A. Fischer, Urs SchulthessAbstract:Abstract Differences in response to vernalization in wheat ( Triticum aestivum L.) were quantified through controlled environment experiments with 26 lines with diverse geographical origins. Vernalization treatments of 0 to 56 d were applied to Plants at their first leaf stAge. All Plants headed irrespective of duration of vernalization treatment. Vernalization response was assessed through the change of final leaf number (FLN) on the main stem at heading. Five lines did not respond to vernalization. FLN for vernalization-sensitive lines generally decreased to a minimum as days of vernalization treatment increased. Plants at and after the stAge where additional vernalization did not reduce FLN were vernalization insensitive. The quantitative features of this vernalization response, up to the point of insensitivity, were characterized with a linear regression: ( F i − 6) = α − βT v , where F i is FLN observed for a particular vernalization treatment, T v is the time in days of that vernalization treatment, and α and β are the Y-intercept and the slope of the regression, respectively. This model fitted the experimental results well. The parameters α and β varied among lines, and are useful for quantifying vernalization response in wheat. The implication of each parameter can be interpreted biologically: α is the “changeable number of leaves”, i.e., how many leaves can be potentially decreased by vernalization treatment, and β represents the “exchange rate” between leaf numbers and vernalization days, i.e., how many leaves can be reduced by one day of vernalization treatment.
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Vernalization in wheat I. A model based on the interchangeability of Plant Age and vernalization duration
Field Crops Research, 1995Co-Authors: Shi-ying Wang, Richard W. Ward, Joe T. Ritchie, R. A. Fischer, Urs SchulthessAbstract:Abstract Vernalization treatments of 0 to 70 d initiated when 0 to 8 leaf tips were visible were applied to Plants of the winter wheat ( Triticum aestivum L.) cultivars Pioneer 2548 and Augusta. All Plants headed irrespective of duration of vernalization. Unvernalized Plants of Pioneer 2548 and Augusta had mean final leaf numbers (FLN) of 20.8 ± 1.3 and 21.7 ± 1.0, respectively. Increased duration of vernalization generally reduced FLN within an Age treatment until an Age-dependent point of vernalization insensitivity was reached. Estimates of the minimum days of vernalization required to reach vernalization insensitivity decreased in a linear fashion as Plant Age at the onset of vernalization treatment increased. The number of leaves appearing after the onset of vernalization insensitivity averAged 6.3 ± 0.5. FLN minus six appears to be a valid estimate in our experimental conditions for the onset of vernalization insensitivity, at least for Plants that had six or more leaves appearing after the end of vernalization treatment. Linear regressions of FLN minus six against days of vernalization were significant for both cultivars (for treatments with six or more leaves emerging after vernalization). The Y-intercepts of the fitted regressions were close to values obtained by subtracting six from FLN of unvernalized Plants. Both intercept and slope were controlled genetically. Accumulated Plant Age, expressed as leaf stAge, enables attainment of vernalization insensitivity, independent of, or in combination with vernalization treatment.
Shi-ying Wang - One of the best experts on this subject based on the ideXlab platform.
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Vernalization in wheat II. Genetic variability for the interchangeability of Plant Age and vernalization duration
Field Crops Research, 1995Co-Authors: Shi-ying Wang, Richard W. Ward, Joe T. Ritchie, R. A. Fischer, Urs SchulthessAbstract:Abstract Differences in response to vernalization in wheat ( Triticum aestivum L.) were quantified through controlled environment experiments with 26 lines with diverse geographical origins. Vernalization treatments of 0 to 56 d were applied to Plants at their first leaf stAge. All Plants headed irrespective of duration of vernalization treatment. Vernalization response was assessed through the change of final leaf number (FLN) on the main stem at heading. Five lines did not respond to vernalization. FLN for vernalization-sensitive lines generally decreased to a minimum as days of vernalization treatment increased. Plants at and after the stAge where additional vernalization did not reduce FLN were vernalization insensitive. The quantitative features of this vernalization response, up to the point of insensitivity, were characterized with a linear regression: ( F i − 6) = α − βT v , where F i is FLN observed for a particular vernalization treatment, T v is the time in days of that vernalization treatment, and α and β are the Y-intercept and the slope of the regression, respectively. This model fitted the experimental results well. The parameters α and β varied among lines, and are useful for quantifying vernalization response in wheat. The implication of each parameter can be interpreted biologically: α is the “changeable number of leaves”, i.e., how many leaves can be potentially decreased by vernalization treatment, and β represents the “exchange rate” between leaf numbers and vernalization days, i.e., how many leaves can be reduced by one day of vernalization treatment.
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Vernalization in wheat I. A model based on the interchangeability of Plant Age and vernalization duration
Field Crops Research, 1995Co-Authors: Shi-ying Wang, Richard W. Ward, Joe T. Ritchie, R. A. Fischer, Urs SchulthessAbstract:Abstract Vernalization treatments of 0 to 70 d initiated when 0 to 8 leaf tips were visible were applied to Plants of the winter wheat ( Triticum aestivum L.) cultivars Pioneer 2548 and Augusta. All Plants headed irrespective of duration of vernalization. Unvernalized Plants of Pioneer 2548 and Augusta had mean final leaf numbers (FLN) of 20.8 ± 1.3 and 21.7 ± 1.0, respectively. Increased duration of vernalization generally reduced FLN within an Age treatment until an Age-dependent point of vernalization insensitivity was reached. Estimates of the minimum days of vernalization required to reach vernalization insensitivity decreased in a linear fashion as Plant Age at the onset of vernalization treatment increased. The number of leaves appearing after the onset of vernalization insensitivity averAged 6.3 ± 0.5. FLN minus six appears to be a valid estimate in our experimental conditions for the onset of vernalization insensitivity, at least for Plants that had six or more leaves appearing after the end of vernalization treatment. Linear regressions of FLN minus six against days of vernalization were significant for both cultivars (for treatments with six or more leaves emerging after vernalization). The Y-intercepts of the fitted regressions were close to values obtained by subtracting six from FLN of unvernalized Plants. Both intercept and slope were controlled genetically. Accumulated Plant Age, expressed as leaf stAge, enables attainment of vernalization insensitivity, independent of, or in combination with vernalization treatment.
Richard W. Ward - One of the best experts on this subject based on the ideXlab platform.
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Vernalization in wheat II. Genetic variability for the interchangeability of Plant Age and vernalization duration
Field Crops Research, 1995Co-Authors: Shi-ying Wang, Richard W. Ward, Joe T. Ritchie, R. A. Fischer, Urs SchulthessAbstract:Abstract Differences in response to vernalization in wheat ( Triticum aestivum L.) were quantified through controlled environment experiments with 26 lines with diverse geographical origins. Vernalization treatments of 0 to 56 d were applied to Plants at their first leaf stAge. All Plants headed irrespective of duration of vernalization treatment. Vernalization response was assessed through the change of final leaf number (FLN) on the main stem at heading. Five lines did not respond to vernalization. FLN for vernalization-sensitive lines generally decreased to a minimum as days of vernalization treatment increased. Plants at and after the stAge where additional vernalization did not reduce FLN were vernalization insensitive. The quantitative features of this vernalization response, up to the point of insensitivity, were characterized with a linear regression: ( F i − 6) = α − βT v , where F i is FLN observed for a particular vernalization treatment, T v is the time in days of that vernalization treatment, and α and β are the Y-intercept and the slope of the regression, respectively. This model fitted the experimental results well. The parameters α and β varied among lines, and are useful for quantifying vernalization response in wheat. The implication of each parameter can be interpreted biologically: α is the “changeable number of leaves”, i.e., how many leaves can be potentially decreased by vernalization treatment, and β represents the “exchange rate” between leaf numbers and vernalization days, i.e., how many leaves can be reduced by one day of vernalization treatment.
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Vernalization in wheat I. A model based on the interchangeability of Plant Age and vernalization duration
Field Crops Research, 1995Co-Authors: Shi-ying Wang, Richard W. Ward, Joe T. Ritchie, R. A. Fischer, Urs SchulthessAbstract:Abstract Vernalization treatments of 0 to 70 d initiated when 0 to 8 leaf tips were visible were applied to Plants of the winter wheat ( Triticum aestivum L.) cultivars Pioneer 2548 and Augusta. All Plants headed irrespective of duration of vernalization. Unvernalized Plants of Pioneer 2548 and Augusta had mean final leaf numbers (FLN) of 20.8 ± 1.3 and 21.7 ± 1.0, respectively. Increased duration of vernalization generally reduced FLN within an Age treatment until an Age-dependent point of vernalization insensitivity was reached. Estimates of the minimum days of vernalization required to reach vernalization insensitivity decreased in a linear fashion as Plant Age at the onset of vernalization treatment increased. The number of leaves appearing after the onset of vernalization insensitivity averAged 6.3 ± 0.5. FLN minus six appears to be a valid estimate in our experimental conditions for the onset of vernalization insensitivity, at least for Plants that had six or more leaves appearing after the end of vernalization treatment. Linear regressions of FLN minus six against days of vernalization were significant for both cultivars (for treatments with six or more leaves emerging after vernalization). The Y-intercepts of the fitted regressions were close to values obtained by subtracting six from FLN of unvernalized Plants. Both intercept and slope were controlled genetically. Accumulated Plant Age, expressed as leaf stAge, enables attainment of vernalization insensitivity, independent of, or in combination with vernalization treatment.
Joe T. Ritchie - One of the best experts on this subject based on the ideXlab platform.
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Vernalization in wheat II. Genetic variability for the interchangeability of Plant Age and vernalization duration
Field Crops Research, 1995Co-Authors: Shi-ying Wang, Richard W. Ward, Joe T. Ritchie, R. A. Fischer, Urs SchulthessAbstract:Abstract Differences in response to vernalization in wheat ( Triticum aestivum L.) were quantified through controlled environment experiments with 26 lines with diverse geographical origins. Vernalization treatments of 0 to 56 d were applied to Plants at their first leaf stAge. All Plants headed irrespective of duration of vernalization treatment. Vernalization response was assessed through the change of final leaf number (FLN) on the main stem at heading. Five lines did not respond to vernalization. FLN for vernalization-sensitive lines generally decreased to a minimum as days of vernalization treatment increased. Plants at and after the stAge where additional vernalization did not reduce FLN were vernalization insensitive. The quantitative features of this vernalization response, up to the point of insensitivity, were characterized with a linear regression: ( F i − 6) = α − βT v , where F i is FLN observed for a particular vernalization treatment, T v is the time in days of that vernalization treatment, and α and β are the Y-intercept and the slope of the regression, respectively. This model fitted the experimental results well. The parameters α and β varied among lines, and are useful for quantifying vernalization response in wheat. The implication of each parameter can be interpreted biologically: α is the “changeable number of leaves”, i.e., how many leaves can be potentially decreased by vernalization treatment, and β represents the “exchange rate” between leaf numbers and vernalization days, i.e., how many leaves can be reduced by one day of vernalization treatment.
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Vernalization in wheat I. A model based on the interchangeability of Plant Age and vernalization duration
Field Crops Research, 1995Co-Authors: Shi-ying Wang, Richard W. Ward, Joe T. Ritchie, R. A. Fischer, Urs SchulthessAbstract:Abstract Vernalization treatments of 0 to 70 d initiated when 0 to 8 leaf tips were visible were applied to Plants of the winter wheat ( Triticum aestivum L.) cultivars Pioneer 2548 and Augusta. All Plants headed irrespective of duration of vernalization. Unvernalized Plants of Pioneer 2548 and Augusta had mean final leaf numbers (FLN) of 20.8 ± 1.3 and 21.7 ± 1.0, respectively. Increased duration of vernalization generally reduced FLN within an Age treatment until an Age-dependent point of vernalization insensitivity was reached. Estimates of the minimum days of vernalization required to reach vernalization insensitivity decreased in a linear fashion as Plant Age at the onset of vernalization treatment increased. The number of leaves appearing after the onset of vernalization insensitivity averAged 6.3 ± 0.5. FLN minus six appears to be a valid estimate in our experimental conditions for the onset of vernalization insensitivity, at least for Plants that had six or more leaves appearing after the end of vernalization treatment. Linear regressions of FLN minus six against days of vernalization were significant for both cultivars (for treatments with six or more leaves emerging after vernalization). The Y-intercepts of the fitted regressions were close to values obtained by subtracting six from FLN of unvernalized Plants. Both intercept and slope were controlled genetically. Accumulated Plant Age, expressed as leaf stAge, enables attainment of vernalization insensitivity, independent of, or in combination with vernalization treatment.
R. A. Fischer - One of the best experts on this subject based on the ideXlab platform.
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Vernalization in wheat II. Genetic variability for the interchangeability of Plant Age and vernalization duration
Field Crops Research, 1995Co-Authors: Shi-ying Wang, Richard W. Ward, Joe T. Ritchie, R. A. Fischer, Urs SchulthessAbstract:Abstract Differences in response to vernalization in wheat ( Triticum aestivum L.) were quantified through controlled environment experiments with 26 lines with diverse geographical origins. Vernalization treatments of 0 to 56 d were applied to Plants at their first leaf stAge. All Plants headed irrespective of duration of vernalization treatment. Vernalization response was assessed through the change of final leaf number (FLN) on the main stem at heading. Five lines did not respond to vernalization. FLN for vernalization-sensitive lines generally decreased to a minimum as days of vernalization treatment increased. Plants at and after the stAge where additional vernalization did not reduce FLN were vernalization insensitive. The quantitative features of this vernalization response, up to the point of insensitivity, were characterized with a linear regression: ( F i − 6) = α − βT v , where F i is FLN observed for a particular vernalization treatment, T v is the time in days of that vernalization treatment, and α and β are the Y-intercept and the slope of the regression, respectively. This model fitted the experimental results well. The parameters α and β varied among lines, and are useful for quantifying vernalization response in wheat. The implication of each parameter can be interpreted biologically: α is the “changeable number of leaves”, i.e., how many leaves can be potentially decreased by vernalization treatment, and β represents the “exchange rate” between leaf numbers and vernalization days, i.e., how many leaves can be reduced by one day of vernalization treatment.
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Vernalization in wheat I. A model based on the interchangeability of Plant Age and vernalization duration
Field Crops Research, 1995Co-Authors: Shi-ying Wang, Richard W. Ward, Joe T. Ritchie, R. A. Fischer, Urs SchulthessAbstract:Abstract Vernalization treatments of 0 to 70 d initiated when 0 to 8 leaf tips were visible were applied to Plants of the winter wheat ( Triticum aestivum L.) cultivars Pioneer 2548 and Augusta. All Plants headed irrespective of duration of vernalization. Unvernalized Plants of Pioneer 2548 and Augusta had mean final leaf numbers (FLN) of 20.8 ± 1.3 and 21.7 ± 1.0, respectively. Increased duration of vernalization generally reduced FLN within an Age treatment until an Age-dependent point of vernalization insensitivity was reached. Estimates of the minimum days of vernalization required to reach vernalization insensitivity decreased in a linear fashion as Plant Age at the onset of vernalization treatment increased. The number of leaves appearing after the onset of vernalization insensitivity averAged 6.3 ± 0.5. FLN minus six appears to be a valid estimate in our experimental conditions for the onset of vernalization insensitivity, at least for Plants that had six or more leaves appearing after the end of vernalization treatment. Linear regressions of FLN minus six against days of vernalization were significant for both cultivars (for treatments with six or more leaves emerging after vernalization). The Y-intercepts of the fitted regressions were close to values obtained by subtracting six from FLN of unvernalized Plants. Both intercept and slope were controlled genetically. Accumulated Plant Age, expressed as leaf stAge, enables attainment of vernalization insensitivity, independent of, or in combination with vernalization treatment.
