Abstract：The genetic mechanism underlying yield traits is very complex, while QTL of rice yield traits which are uncovered in nitrogen starvation condition can provide a valuable reference to explain the genetic mechanism of yield traits, and facilitate fine QTL mapping and gene cloning, as well as screening of selective breeding of rice varieties tolerant to nitrogen starvation. In this study, 66 ILS population derived from the cross of Shuhui 527(Oryza. sativa ssp. indica) and Chujing 12(O. sativa ssp. japonica) which were served as the recurrent parent and donor parent; both marker-assisted selecting and high-generation backcrossing were used to detect QTL under the field experiment with normal and nitrogen starvation conditions by mapping with the single marker. A total of 24 QTLs were detected. Among of these QTLs, 20 QTLs were newly characterized, while qpn-1, qph-1, qby-4 and qby-2 were similar to the previous studies. qph-1a and qph-1b could affect the height of the site under the different treatments; we also found that both in the QTL of panicle number and grain yield per plant were linked with marker RM521 under nitrogen starvation condition; the additive effects of qpn-1b, qpn-2a and qpn-2b were less than 1. The results show that nitrogen starvation has strong negative effect on grain yield, panicle number, and biomass yield. Introgression lines population has strong ability for detecting micro effect QTL.
