Abstract
Maize species differ in their ability to take up phosphorus (P) from the soil, and these differences are attributed to the morphology and physiology of plants relative to their germplasm base. An effective method of increasing P efficiency in maize is to select and evaluate genotypes that can produce a high yield under P deficient conditions. In this study, 116 maize inbred lines with various genetic backgrounds collected from several Agricultural Universities and Institutes in China were evaluated in a field experiment to identify genotypic differences in P efficiency in 2007. Overall, 15 maize inbred lines were selected from the 116 inbred lines during the 5-year field experimental period based on their 100-grain weight in P-deficient soil at maturity, when compared to the characteristics exhibited in P-sufficient soil. All of the selected lines were evaluated in field experiments from 2008 to 2010 for their tolerance to low-P at the seedling and maturity stages. Inhibition (%) was used and defined as the parameter measured under P limitation compared to the parameters measured under P sufficiency to evaluate the genotypic variation in tolerance. Inhibition of root length, root surface area, volume, root: shoot ratio and P uptake efficiency could be used as
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Yang, J. C.;
Jiang, H. M.;
Zhang, J. F.;
Li, L. L.;
Li, G. H.
[1]
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing (China)
Citation Formats
Yang, J. C., Jiang, H. M., Zhang, J. F., Li, L. L., and Li, G. H.
Selection and Evaluation of Maize Genotypes Tolerance to Low Phosphorus Soils.
IAEA: N. p.,
2013.
Web.
Yang, J. C., Jiang, H. M., Zhang, J. F., Li, L. L., & Li, G. H.
Selection and Evaluation of Maize Genotypes Tolerance to Low Phosphorus Soils.
IAEA.
Yang, J. C., Jiang, H. M., Zhang, J. F., Li, L. L., and Li, G. H.
2013.
"Selection and Evaluation of Maize Genotypes Tolerance to Low Phosphorus Soils."
IAEA.
@misc{etde_22192677,
title = {Selection and Evaluation of Maize Genotypes Tolerance to Low Phosphorus Soils}
author = {Yang, J. C., Jiang, H. M., Zhang, J. F., Li, L. L., and Li, G. H.}
abstractNote = {Maize species differ in their ability to take up phosphorus (P) from the soil, and these differences are attributed to the morphology and physiology of plants relative to their germplasm base. An effective method of increasing P efficiency in maize is to select and evaluate genotypes that can produce a high yield under P deficient conditions. In this study, 116 maize inbred lines with various genetic backgrounds collected from several Agricultural Universities and Institutes in China were evaluated in a field experiment to identify genotypic differences in P efficiency in 2007. Overall, 15 maize inbred lines were selected from the 116 inbred lines during the 5-year field experimental period based on their 100-grain weight in P-deficient soil at maturity, when compared to the characteristics exhibited in P-sufficient soil. All of the selected lines were evaluated in field experiments from 2008 to 2010 for their tolerance to low-P at the seedling and maturity stages. Inhibition (%) was used and defined as the parameter measured under P limitation compared to the parameters measured under P sufficiency to evaluate the genotypic variation in tolerance. Inhibition of root length, root surface area, volume, root: shoot ratio and P uptake efficiency could be used as indices to assess the genotypic tolerance to P limitation. Low-P tolerant genotypes could uptake more P and accumulate more dry matter at the seedling stage. A strong relationship between the total biomass and root length was exhibited. In order to understand the mechanisms of the genotypic tolerance to low-P soil to utilize P from the sparing soluble P forms, 5 maize genotypes selected out of the 15 maize inbred lines, according to the four quadrant distribution, was used as the criteria in a {sup 32}P isotope tracer experiment to follow the recovery of {sup 32}P in soil P fractions. The {sup 32}P tracer results showed a higher rate for water- soluble P transformation to slowly available P in P deficient soil than in soil with sufficient P. The L- values showed that different genotypes had different soil P-use efficiency and low-P tolerance mechanisms. A low-P tolerant cultivar DSY-32 regulated soil P use efficiency and plant P content according to the L-value under exogenous P fertilizer application. However, another low-P tolerant cultivar, DSY-2, utilized soil P more efficiently, regardless of the L-value. In conclusion, the study exploited the physiological-biochemical mechanism on P-uptake, and P-transport of selected maize genotypes in low-P soil under field conditions, and the {sup 32}P tracer technique proved to be a valuable tool that sought physiological explanations for superior genotype performance. (author)}
place = {IAEA}
year = {2013}
month = {Nov}
}
title = {Selection and Evaluation of Maize Genotypes Tolerance to Low Phosphorus Soils}
author = {Yang, J. C., Jiang, H. M., Zhang, J. F., Li, L. L., and Li, G. H.}
abstractNote = {Maize species differ in their ability to take up phosphorus (P) from the soil, and these differences are attributed to the morphology and physiology of plants relative to their germplasm base. An effective method of increasing P efficiency in maize is to select and evaluate genotypes that can produce a high yield under P deficient conditions. In this study, 116 maize inbred lines with various genetic backgrounds collected from several Agricultural Universities and Institutes in China were evaluated in a field experiment to identify genotypic differences in P efficiency in 2007. Overall, 15 maize inbred lines were selected from the 116 inbred lines during the 5-year field experimental period based on their 100-grain weight in P-deficient soil at maturity, when compared to the characteristics exhibited in P-sufficient soil. All of the selected lines were evaluated in field experiments from 2008 to 2010 for their tolerance to low-P at the seedling and maturity stages. Inhibition (%) was used and defined as the parameter measured under P limitation compared to the parameters measured under P sufficiency to evaluate the genotypic variation in tolerance. Inhibition of root length, root surface area, volume, root: shoot ratio and P uptake efficiency could be used as indices to assess the genotypic tolerance to P limitation. Low-P tolerant genotypes could uptake more P and accumulate more dry matter at the seedling stage. A strong relationship between the total biomass and root length was exhibited. In order to understand the mechanisms of the genotypic tolerance to low-P soil to utilize P from the sparing soluble P forms, 5 maize genotypes selected out of the 15 maize inbred lines, according to the four quadrant distribution, was used as the criteria in a {sup 32}P isotope tracer experiment to follow the recovery of {sup 32}P in soil P fractions. The {sup 32}P tracer results showed a higher rate for water- soluble P transformation to slowly available P in P deficient soil than in soil with sufficient P. The L- values showed that different genotypes had different soil P-use efficiency and low-P tolerance mechanisms. A low-P tolerant cultivar DSY-32 regulated soil P use efficiency and plant P content according to the L-value under exogenous P fertilizer application. However, another low-P tolerant cultivar, DSY-2, utilized soil P more efficiently, regardless of the L-value. In conclusion, the study exploited the physiological-biochemical mechanism on P-uptake, and P-transport of selected maize genotypes in low-P soil under field conditions, and the {sup 32}P tracer technique proved to be a valuable tool that sought physiological explanations for superior genotype performance. (author)}
place = {IAEA}
year = {2013}
month = {Nov}
}