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在水稻 (IR6 4× Azucena) DH群体中应用分子标记连锁图 ,对不同供氮水平下的穗长性状进行 QTL区间作图分析。在高氮水平下检测到控制穗长的 QTL s 2个 ,分别位于第 1和第 4染色体上 ;在低氮水平下检测到 5个穗长 QTL s,其中 3个分别位于第 1、4和 6染色体上 ,2个位于第 3染色体的不同部位 ,说明穗长 QTL与供氮水平之间可能存在交互效应。基于这种互作效应及研究中观察到的两供试亲本对低氮胁迫的耐性差异 ,推测仅在低氮水平下检测到的穗长 QTLs可能跟水稻对低氮胁迫耐性有一定的关联。
Molecular linkage map was used in the DH population of rice (IR6 4 × Azucena) to map the QTLs of panicle length traits under different nitrogen levels. Two QTLs for controlling spike length were detected at high nitrogen levels, located on chromosomes 1 and 4, respectively. Five QTLs for spike length were detected at low nitrogen levels, of which 3 were located at chromosomes 1, 4, 6 on chromosome 6 and 2 on different sites on chromosome 3, indicating that there may be an interaction effect between the QTL of spike length and the level of nitrogen supply. Based on this interaction and the differences in tolerance of two tested parents to low nitrogen stress observed in the study, it is speculated that QTLs for panicle length detected only at low nitrogen levels may be correlated with low nitrogen tolerance.