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Abstract To reveal the molecular mechanism of the high phosphorus efficiency in maize using existing genetic information and gene resources, a genetic linkage map was constructed for F2 population derived from maize (Zea mays L.) cross of 082(high p)×Ye107(low p) by means of SSR and AFLP. The QTLs for 3 root exudates related to phosphorus efficiency were analyzed according to the phenotypes of 241 F2∶3 families at two stages, two phosphorus treatments and two sites by composite interval mapping. Results showed that a total of 4 QTLs were identified for acid phosphatase and among which AP1-KXNP and AP9-KXNP were identified repeatedly in 4 different conditions. AP1-KXNP was located in the interval bnlg1268a-umc1290a on chromosome 1(bins 1.09) and AP9-KXNP in the interval P1M3/d- P1M3/g on chromosome 9(bins 9.04). Individual QTL explained 9%~16% of the variation of acid phosphatase and the total contribution of the two QTLs was 25%; Five QTLs were identified for organic acid in 4 different conditions , among which only one QTL was identified repeatedly in two different conditions and it was located in the interval P1M3/f-P1M7/g on chromosome 9(bins 9.03); A total of 4 QTLs were identified for H+, none of which was identified in 4 conditions repeatedly. It showed that 2 QTLs AP1-KXNP and AP9-KXNP for acid phosphatase were relatively stable and the 2 QTLs can be used for molecular marker-assisted selection for high phosphorus efficiency in maize.
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Received: 15 April 2010
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