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苗期水稻根部性状的QTL定位
引用本文:徐吉臣,李晶昭,郑先武,邹亮星,朱立煌.苗期水稻根部性状的QTL定位[J].遗传学报,2001,28(5):433-438.
作者姓名:徐吉臣  李晶昭  郑先武  邹亮星  朱立煌
作者单位:中国科学院遗传研究所,
摘    要:耐旱是水稻抗逆研究中最重要的性状之一。利用水稻籼粳品种窄叶青8号(ZYQ8)和京系17(JX17)及其通过杂交F1代花药培养获得的127个单株组成的双单倍体分离群体(double haploid,DH)为材料,在营养液中培养10天后,对影响抗旱能力的根部几个主要性状进行了分析,发现最大根长(Maximum root Length,MRL)、根干重(Dry Root Weight,DRW)和根茎干重比(Root/Shoot Ratio of Dry Weight,RSR)3个性状在群体中变异较大,利用该群体建立的水稻分子遗传图谱,对上述3个水稻性状进行数量性状座位(Quantitative Trait Locus,QTL)的分析定位,结果表明,2/1/2个QTLs的亲本JX17等位基因分别控制着最大根长、根干重和茎士重比的表达,对表型变异的解释率分别为16.4%、17.0%、16.4%、10.4%和19.9%;2/1个QTLs的亲本ZYQ8等位基因分别控制着最大根长和根茎干重比的增加,表表型变异的解释率分别为19.6%、13.0%和13.2%。检测到的8个QTLs分别位地水稻的染色体2、3、4、5、6、9和10上。与其他已发表的定位结果比较表现,在3个性状的总共8个QTLs中,各有1个性状的1个QTL(控制最大根长的L169-CT106A,控制根干重的G45-G1314A和控制根茎干重比的G62-G144)与早先报道的结果相吻合。

关 键 词:营养液  耐旱  QTL  遗传图谱  DH群体  水稻  根部性状  遗传机制
文章编号:0379-4172(2001)05-0433-06
修稿时间:2000年12月15

QTL Mapping of the Root Traits in Rice Seedling
XU Ji-Chen,LI Jing-zhao,ZHENG Xian-wu,ZOU Liang-Xing,ZHU Li-Huang.QTL Mapping of the Root Traits in Rice Seedling[J].Journal of Genetics and Genomics,2001,28(5):433-438.
Authors:XU Ji-Chen  LI Jing-zhao  ZHENG Xian-wu  ZOU Liang-Xing  ZHU Li-Huang
Abstract:Drought resistance is one of the most important traits in rice abiotic study. The report here analyzed several major root traits affecting drought resistance expression with the double haploid population (DH) from ZYQ8 (indica) / JX17(japonica) containing 127 lines. After 10 days solution culturing, three rice root traits, Maximum Root Length (MRL), Dry Root Weight (DRW) and Root / Shoot Ratio of Dry Weight (RSR), were revealed existing significant difference among the DH lines. Using the constructed molecular linkage map from this segregating population, the QTL mapping was conducted among these three root parameters. MRL, DRW, and RSR were found being controlled by 2 / 1 / 2 QTLs respectively in JX17, 2 / 0 / 1 QTLs respectively in ZYQ8. Phenotype variance could be explained by 16.4% and 17.0% for MRL, 16.4% for DRW, 10.4% and 19.9% for RSR in JX17, 19.6% and 13.0% for MRL, 13.2% for RSR in ZYQ8. All these QTLs identified were distributed on rice chromosome 2, 3, 4, 5, 6, 9 and 10. Comparing with the other mapping results, one QTL for each trait (L169-CT106A for MRL, G45-G1314A for DRW, G62~G144 for RSR)was identical with the results reported previously.
Keywords:nutrient solution  drought avoidance  QTL  genetic map  DH population
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