title: Identification of related QTLs at late developmental stage in rice (Oryza sativa L.) under two nitrogen levels.
abstract: QTL underlying related traits at the late developmental stage under two different nitrogen levels were investigated in rice using a population of chromosome segment substitution lines (CSSL) derived from a cross between Teqing and Lemont. A total of 31 QTLs referring 5 traits, that is, plant height (PH), panicle number per plant (PN), chlorophyll content (CC), shoot dry weight (SDW) and grain yield per plant (YD), were detected. Under normal N level, 3 QTLs were detected for each trait, while under low N level, 5, 4, 5 and 2 QTLs were detected for PH, PN, CC and SDW respectively. Most of the QTLs were located on chromosome 2, 3, 7, 11 and 12. QTLs controlling different traits or the same trait under different N levels were mapped on the same or adjacent intervals, forming several clusters in rice chromosomes. More than two traits were controlled by QTLs on one of four intervals (RM30-RM439, RM18-RM478, RM309-RM270, and RM235-RM17), suggesting that there were some pleiotropic effects. It was supposed that some QTLs only detected at low N level might be associated with the ability to tolerate the low N stress in rice.
authors.affiliation: Shanghai Agrobiological Gene Center, China.
authors.forename: Han-Hua
authors.initials: HH
authors.lastname: Tong
authors.forename: Han-Wei
authors.initials: HW
authors.lastname: Mei
authors.forename: Xin-Qiao
authors.initials: XQ
authors.lastname: Yu
authors.forename: Xiao-Yan
authors.initials: XY
authors.lastname: Xu
authors.forename: Ming-Shou
authors.initials: MS
authors.lastname: Li
authors.forename: Shan-Qing
authors.initials: SQ
authors.lastname: Zhang
authors.forename: Li-Jun
authors.initials: LJ
authors.lastname: Luo
mesh_terms: D002734:Chlorophyll / Q000378:metabolism*; D002874:Chromosome Mapping; D032461:Chromosomes, Plant / Q000187:drug effects*; D009584:Nitrogen / Q000494:pharmacology*; D012275:Oryza / Q000235:genetics* / Q000254:growth & development; D040641:Quantitative Trait Loci / Q000235:genetics* / Q000502:physiology
chemical_list: D002734:Chlorophyll; D009584:Nitrogen