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Frontiers of Agriculture in China

ISSN 1673-7334

ISSN 1673-744X(Online)

CN 11-5729/S

Front Agric Chin    2011, Vol. 5 Issue (4) : 456-462     DOI: 10.1007/s11703-011-1079-1
The candidate QTLs affecting phosphorus absorption efficiency and root weight in maize (Zea mays L.)
Junyi CHEN(), Li XU
Institute of Medical Biotechnology in Chongqing, Chongqing Medical and Pharmaceutical College, Chongqing 401331, China
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A maize F2 population was first used to construct a genetic linkage map of Chromosome 6 covering 117.6 cM with an average interval of 3.68 cM between adjacent markers. Based on composite interval mapping (CIM), the quantitative trait loci (QTL) for phosphorus absorption efficiency (PAE) and root-related traits was detected in four environments, i.e., Kaixian County under deficient phosphorus (KXDP), Kaixian County under normal phosphorus (KXNP), SUDP1, and SUDP2. QTLs affecting root weight (RW) were detected simultaneously at the dupssr15 locus region (bin 6.06) on Chromosome 6 in the four environments, while QTL affecting taproot length and fiber number was only detected in one or two environments. The result suggested that taproot length and fiber number were more easily affected by the environment than PAE and RW. The alleles originating from 082 increased PAE and RW on Chromosome 6. The QTL on bin 6.06 explained 4%–10% and 4%–8% of the total phenotypic variance of PAE and RW, respectively, and the estimates of the genetic effects presented dominance and overdominance. The QTL for RW in the dupssr15 locus is the minor QTLs environment interactive effects, which should be particularly useful in MAS manipulation of breeding maize.

Keywords maize      QTL analysis      candidate QTLs      phosphorus absorption efficiency      root-related traits      four environments     
Corresponding Authors: CHEN Junyi,   
Issue Date: 05 December 2011
URL:     OR
EnvironmentsTraitsParentsF2∶3 families
Tab.1  Estimates of genetic variance () and environment variance () among 241 F families from the cross of 082 × Ye107
TraitsSource of variationSSDegree of freedomF value
Total variation838.73963
Total variation1706.13963
Total variation46387.04963
Total variation4824794.00963
Tab.2  value of ANOVA for effects
Tab.3  Analysis of correlation among PAE, RW, RL, and FN
NameCQPInterval markersClosest markerBinsLODR2 (%)TR2 (%)ADGADir
PAE6-SUDP2698.3dupssr15- P1M7/adupssr156.063.16340.15420.0981PD082
PAE2-KXNP246.0umc1185- umc1555umc11852.032.56212-0.13560.3246ODYe107
PAE6-KXNP698.3dupssr15- P1M7/adupssr156.063.32490.21130.0982PD082
PAE9-KXNP986.6P1M3/d- P1M3/gP1M3/g9.042.562110.16030.2409OD082
PAE6-KXDP698.3dupssr15- P1M7/adupssr156.062.53390.19300.0850PD082
PAE9-KXDP986.6P1M3/d- P1M3/gP1M3/g9.042.51280.13600.2790OD082
RW6-SUDP2698.3dupssr15- P1M7/adupssr156.063.16340.25700.1635PD082
RW6-KXNP698.3dupssr15- P1M7/adupssr156.063.31340.17620.1042PD082
RW6-KXDP698.3dupssr15- P1M7/adupssr156.063.16340.14280.0908PD082
RW6-SUDP1698.3dupssr15- P1M7/adupssr156.062.55380.20700.0632PD082
FN6-KXNP698.3dupssr15- P1M7/adupssr156.063.15377.48924.2827PD082
Tab.4  Quantitative trait loci (QTLs) detected for PAE, RW, RL, and FN with the F families from the cross of 082 × Ye107
Fig.1  Linkage map of QTLs for PAE, RW, RL, and FN.
Fig.1  Linkage map of QTLs for PAE, RW, RL, and FN.
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