Maize is susceptible to a number of diseases that can infect all plant organs and serve as a constraint on cereal production. The reduction in cereal production caused by disease is estimated at an average of 9.4%. Co...Maize is susceptible to a number of diseases that can infect all plant organs and serve as a constraint on cereal production. The reduction in cereal production caused by disease is estimated at an average of 9.4%. Corn root rot contributes greatly to the reduction in grain production and quality. The main objective of this work was to review the research on root rot in maize to determine the susceptibility of genotypes to root rot and to quantify the inheritance of resistance to root rot in maize. The methodology used was a complete 8 × 8 diallel design planted during the year 1999/2000. Root discoloration, plant length, root volume, effective volume and yield were the evaluated parameters. To analyze the data and determine the combinatorial abilities, genetic correlations, heritability and correlated response, diallel analysis was used. Eight parental lines;P28, I137TN, MP706, E739, MO17, B37, B73, and B14 were planted. The lines were crossed into each other, all combinations according to the complete diallel model (Model 1). The F1 was harvested after maturation. For statistical analysis, the version of the Agrobase program (2016) was used. Results show that F1 hybrids showed significant differences in root rot discoloration, plant height, root volume, effective root volume and yield. The P28 line and the B73XE739 cross had, respectively, the highest general and specific combinations. Root discoloration had the highest genetic correlation (r<sub>A</sub> = 0.47) with plant length. Broad and narrow heritability for root rot discoloration were, respectively, h<sup>2</sup> = 0.81 and h<sub>2</sub><sub> </sub>= 0.51. Root rot discoloration showed the highest correlated response (C<sub>R</sub> = 0.14) on plant length.展开更多
大豆胞囊线虫3号生理小种在我国已发现的8个小种中分布最为广泛,严重影响大豆生产。中品03-5373(ZP03-5373)是对3号小种免疫的优良抗源。本研究以中品03-5373为母本,与感病品种中黄13(ZH13)杂交建立包含254个家系的重组自交系群体,利用...大豆胞囊线虫3号生理小种在我国已发现的8个小种中分布最为广泛,严重影响大豆生产。中品03-5373(ZP03-5373)是对3号小种免疫的优良抗源。本研究以中品03-5373为母本,与感病品种中黄13(ZH13)杂交建立包含254个家系的重组自交系群体,利用SSR、EST-SSR、In Del和SNP等506个分子标记对该分离群体进行基因型鉴定,构建全长为2651.90 c M的遗传图谱,标记间平均距离为5.24 c M。结合抗性鉴定数据,在中品03-5373中检测到3个控制大豆胞囊线虫3号生理小种的QTL区间,分别位于Gm07(SCN3-7)、Gm11(SCN3-11)和Gm18(SCN3-18)。其中SCN3-18可解释29.5%的抗性变异,为主效抗性位点;SCN3-7和SCN3-11分别控制6.2%和5.5%的抗性变异,为微效位点。SCN3-7与SCN3-18间存在显著的上位性互作。通过对中品03-5373祖先亲本2个QTL区间(SCN3-7和SCN3-11)侧翼标记的系谱追踪,进一步证明SCN3-7和SCN3-11与大豆胞囊线虫3号抗性相关。展开更多
文摘Maize is susceptible to a number of diseases that can infect all plant organs and serve as a constraint on cereal production. The reduction in cereal production caused by disease is estimated at an average of 9.4%. Corn root rot contributes greatly to the reduction in grain production and quality. The main objective of this work was to review the research on root rot in maize to determine the susceptibility of genotypes to root rot and to quantify the inheritance of resistance to root rot in maize. The methodology used was a complete 8 × 8 diallel design planted during the year 1999/2000. Root discoloration, plant length, root volume, effective volume and yield were the evaluated parameters. To analyze the data and determine the combinatorial abilities, genetic correlations, heritability and correlated response, diallel analysis was used. Eight parental lines;P28, I137TN, MP706, E739, MO17, B37, B73, and B14 were planted. The lines were crossed into each other, all combinations according to the complete diallel model (Model 1). The F1 was harvested after maturation. For statistical analysis, the version of the Agrobase program (2016) was used. Results show that F1 hybrids showed significant differences in root rot discoloration, plant height, root volume, effective root volume and yield. The P28 line and the B73XE739 cross had, respectively, the highest general and specific combinations. Root discoloration had the highest genetic correlation (r<sub>A</sub> = 0.47) with plant length. Broad and narrow heritability for root rot discoloration were, respectively, h<sup>2</sup> = 0.81 and h<sub>2</sub><sub> </sub>= 0.51. Root rot discoloration showed the highest correlated response (C<sub>R</sub> = 0.14) on plant length.
文摘大豆胞囊线虫3号生理小种在我国已发现的8个小种中分布最为广泛,严重影响大豆生产。中品03-5373(ZP03-5373)是对3号小种免疫的优良抗源。本研究以中品03-5373为母本,与感病品种中黄13(ZH13)杂交建立包含254个家系的重组自交系群体,利用SSR、EST-SSR、In Del和SNP等506个分子标记对该分离群体进行基因型鉴定,构建全长为2651.90 c M的遗传图谱,标记间平均距离为5.24 c M。结合抗性鉴定数据,在中品03-5373中检测到3个控制大豆胞囊线虫3号生理小种的QTL区间,分别位于Gm07(SCN3-7)、Gm11(SCN3-11)和Gm18(SCN3-18)。其中SCN3-18可解释29.5%的抗性变异,为主效抗性位点;SCN3-7和SCN3-11分别控制6.2%和5.5%的抗性变异,为微效位点。SCN3-7与SCN3-18间存在显著的上位性互作。通过对中品03-5373祖先亲本2个QTL区间(SCN3-7和SCN3-11)侧翼标记的系谱追踪,进一步证明SCN3-7和SCN3-11与大豆胞囊线虫3号抗性相关。
