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Large-scale evaluation of maize germplasm for low-phosphorus tolerance.

Zhang H, Xu R, Xie C, Huang C, Liao H, Xu Y, Wang J, Li WX - PLoS ONE (2015)

Bottom Line: Low-phosphorus (LP) stress is a global problem for maize production and has been exacerbated by breeding activities that have reduced the genetic diversity of maize.LP-tolerant and -sensitive accessions were selected based on the relative trait values of all traits using principal component analysis, and all the 14 traits of the tolerant maize accessions showed less reduction than the sensitive accessions under LP conditions.This large-scale evaluation provides useful information, LP-tolerant germplasm resources and evaluation protocol for genetic analysis and developing maize varieties for LP tolerance.

View Article: PubMed Central - PubMed

Affiliation: Institute of Crop Science, National Key Facility of Crop Gene Resources and Genetic Improvement, Chinese Academy of Agricultural Sciences, Beijing, China.

ABSTRACT
Low-phosphorus (LP) stress is a global problem for maize production and has been exacerbated by breeding activities that have reduced the genetic diversity of maize. Although LP tolerance in maize has been previously evaluated, the evaluations were generally performed with only a small number of accessions or with samples collected from a limited area. In this research, 826 maize accessions (including 580 tropical/subtropical accessions and 246 temperate accessions) were evaluated for LP tolerance under field conditions in 2011 and 2012. Plant height (PH) and leaf number were measured at three growth stages. The normalized difference vegetation index (NDVI) and fresh ear weight (FEW) were also measured. Genetic correlation analysis revealed that FEW and NDVI were strongly correlated with PH, especially at later stages. LP-tolerant and -sensitive accessions were selected based on the relative trait values of all traits using principal component analysis, and all the 14 traits of the tolerant maize accessions showed less reduction than the sensitive accessions under LP conditions. LP tolerance was strongly correlated with agronomic performance under LP stress conditions, and both criteria could be used for genetic analysis and breeding of LP tolerance. Temperate accessions showed slightly better LP tolerance than tropical/subtropical ones, although more tolerant accessions were identified from tropical/subtropical accessions, which could be contributed by their larger sample size. This large-scale evaluation provides useful information, LP-tolerant germplasm resources and evaluation protocol for genetic analysis and developing maize varieties for LP tolerance.

No MeSH data available.


Related in: MedlinePlus

Classification of 826 maize accessions for their responses to LP stress based on LPTI and LPPI.LPPI: LP performance index; LPTI: LP tolerance index; TG: tolerant and good-performance group; SG: sensitive and good-performance group; TP: tolerant and poor-performance group; SP: sensitive and poor-performance group. The number in the bracketsis the number of maize accessions in each group.
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pone.0124212.g003: Classification of 826 maize accessions for their responses to LP stress based on LPTI and LPPI.LPPI: LP performance index; LPTI: LP tolerance index; TG: tolerant and good-performance group; SG: sensitive and good-performance group; TP: tolerant and poor-performance group; SP: sensitive and poor-performance group. The number in the bracketsis the number of maize accessions in each group.

Mentions: The significant correlation between LPTI and LPPI (r = 0.56, P < 0.001) suggests that better trait performance under LP conditions would result into greater LP tolerance. The 826 accessions were further classified into four groups based on LPTI and LPPI. The midpoints between the value of 41st and 42nd accessions were taken as the dividing points for selecting the top and bottom ~5% of the four groups. Thus, the corresponding dividing points for selecting the top and bottom ~5% accessions were 5.32 and -4.44 for LPPI and 3.25 and -2.92 for LPT1. As shown in Fig 3, the coordinates of the dividing points in the first, second, third, and fourth quadrants were 5.32 and 3.25, -4.44 and 3.25, -4.44 and -2.92, and 5.32 and -2.92, respectively. Two lines that were horizontal to each of the two axes passed through each dividing point, producing four corners in the four quadrants. The extreme accessions in the TG, TP, SG, and SP groups corresponded to the points in the four corners (Fig 3).


Large-scale evaluation of maize germplasm for low-phosphorus tolerance.

Zhang H, Xu R, Xie C, Huang C, Liao H, Xu Y, Wang J, Li WX - PLoS ONE (2015)

Classification of 826 maize accessions for their responses to LP stress based on LPTI and LPPI.LPPI: LP performance index; LPTI: LP tolerance index; TG: tolerant and good-performance group; SG: sensitive and good-performance group; TP: tolerant and poor-performance group; SP: sensitive and poor-performance group. The number in the bracketsis the number of maize accessions in each group.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4418814&req=5

pone.0124212.g003: Classification of 826 maize accessions for their responses to LP stress based on LPTI and LPPI.LPPI: LP performance index; LPTI: LP tolerance index; TG: tolerant and good-performance group; SG: sensitive and good-performance group; TP: tolerant and poor-performance group; SP: sensitive and poor-performance group. The number in the bracketsis the number of maize accessions in each group.
Mentions: The significant correlation between LPTI and LPPI (r = 0.56, P < 0.001) suggests that better trait performance under LP conditions would result into greater LP tolerance. The 826 accessions were further classified into four groups based on LPTI and LPPI. The midpoints between the value of 41st and 42nd accessions were taken as the dividing points for selecting the top and bottom ~5% of the four groups. Thus, the corresponding dividing points for selecting the top and bottom ~5% accessions were 5.32 and -4.44 for LPPI and 3.25 and -2.92 for LPT1. As shown in Fig 3, the coordinates of the dividing points in the first, second, third, and fourth quadrants were 5.32 and 3.25, -4.44 and 3.25, -4.44 and -2.92, and 5.32 and -2.92, respectively. Two lines that were horizontal to each of the two axes passed through each dividing point, producing four corners in the four quadrants. The extreme accessions in the TG, TP, SG, and SP groups corresponded to the points in the four corners (Fig 3).

Bottom Line: Low-phosphorus (LP) stress is a global problem for maize production and has been exacerbated by breeding activities that have reduced the genetic diversity of maize.LP-tolerant and -sensitive accessions were selected based on the relative trait values of all traits using principal component analysis, and all the 14 traits of the tolerant maize accessions showed less reduction than the sensitive accessions under LP conditions.This large-scale evaluation provides useful information, LP-tolerant germplasm resources and evaluation protocol for genetic analysis and developing maize varieties for LP tolerance.

View Article: PubMed Central - PubMed

Affiliation: Institute of Crop Science, National Key Facility of Crop Gene Resources and Genetic Improvement, Chinese Academy of Agricultural Sciences, Beijing, China.

ABSTRACT
Low-phosphorus (LP) stress is a global problem for maize production and has been exacerbated by breeding activities that have reduced the genetic diversity of maize. Although LP tolerance in maize has been previously evaluated, the evaluations were generally performed with only a small number of accessions or with samples collected from a limited area. In this research, 826 maize accessions (including 580 tropical/subtropical accessions and 246 temperate accessions) were evaluated for LP tolerance under field conditions in 2011 and 2012. Plant height (PH) and leaf number were measured at three growth stages. The normalized difference vegetation index (NDVI) and fresh ear weight (FEW) were also measured. Genetic correlation analysis revealed that FEW and NDVI were strongly correlated with PH, especially at later stages. LP-tolerant and -sensitive accessions were selected based on the relative trait values of all traits using principal component analysis, and all the 14 traits of the tolerant maize accessions showed less reduction than the sensitive accessions under LP conditions. LP tolerance was strongly correlated with agronomic performance under LP stress conditions, and both criteria could be used for genetic analysis and breeding of LP tolerance. Temperate accessions showed slightly better LP tolerance than tropical/subtropical ones, although more tolerant accessions were identified from tropical/subtropical accessions, which could be contributed by their larger sample size. This large-scale evaluation provides useful information, LP-tolerant germplasm resources and evaluation protocol for genetic analysis and developing maize varieties for LP tolerance.

No MeSH data available.


Related in: MedlinePlus