Internode number and length are the foundation to constitute plant height, ear height and the above-ground spatial structure of maize plant. In this study, segregating populations were constructed between EHel with ex...Internode number and length are the foundation to constitute plant height, ear height and the above-ground spatial structure of maize plant. In this study, segregating populations were constructed between EHel with extremely low ear height and B73. Through the SNP-based genotyping and phenotypic characterization, 13 QTL distributed on the chromosomes (Chrs) of Chr1, Chr2, Chr5-Chr8 were detected for four traits of internode no. above ear (INa), average internode length above ear (ILaa), internode no. below ear (INb), and average internode length below ear (ILab). Phenotypic variation explained (PVE) by a single QTL ranged from 6.82% (qILab2-2) to 12.99% (qILaa5). Zm00001d016823 within the physical region of qILaa5, the major QTL for ILaa with the largest PVE was determined as the candidate through the genomic annotation and sequence alignment between EHel and B73. Product of Zm00001d016823 was annotated as a WEB family protein homogenous to At1g75720. qRT-PCR assay showed that Zm00001d016823 highly expressed within the tissue of internode, exhibiting statistically higher expression levels among internodes of IN4 to IN7 in EHel than those in B73 (P Zm00001d016823 might provide novel insight into molecular mechanism beyond phytohormones controlling internode development in maize.展开更多
Wild relatives possess potential genetic diversity for maize (<i><span style="font-family:Verdana;">Zea mays</span></i><span style="font-family:Verdana;"> L.) improvem...Wild relatives possess potential genetic diversity for maize (<i><span style="font-family:Verdana;">Zea mays</span></i><span style="font-family:Verdana;"> L.) improvement. Characterization of maize-</span><i><span style="font-family:Verdana;">mexicana</span></i><span style="font-family:Verdana;"> introgression lines (ILs) is of great value to diversify the genetic base and improve the maize germplasm. Four maize-</span><i><span style="font-family:Verdana;">mexicana</span></i><span style="font-family:Verdana;"> IL generations, </span><i><span style="font-family:Verdana;">i.e.</span></i><span style="font-family:Verdana;"> BC1, BC2, BC3, and RIL, were constructed under the elite inbred background of 48-2, elite inbred line that is widely used in maize breeding in Southwestern China, and were phenotyped in different years and genotyped with 56110 SNPs. The results indicated that 48-2 had higher phenotypic performances than all the characterized ILs on most of the agronomic traits. Compared with other ILs, BC2 individuals exhibited more similar performance to 48-2 on most traits and possessed the highest kernel ratio (66.5%). Population structure and principal component analysis indicated that BC3 individuals gathered closer to 48-2 and exhibited the lowest </span><i><span style="font-family:Verdana;">mexicana</span></i><span style="font-family:Verdana;">-introgression frequency (0.50%), while BC2 (29.06%) and RIL (18.52%) showed higher introgression frequency. The high level of genetic diversity observed in the maize-</span><i><span style="font-family:Verdana;">mexicana</span></i><span style="font-family:Verdana;"> ILs demonstrated that </span><i><span style="font-family:Verdana;">Z</span></i><span style="font-family:Verdana;">. </span><i><span style="font-family:Verdana;">mays</span></i><span style="font-family:Verdana;"> ssp. </span><i><span style="font-family:Verdana;">mexicana </span></i><span style="font-family:Verdana;">can serve as a potential source for the enrichment of maize germplasm.</span>展开更多
目的:分析阿帕替尼治疗复发性和进展性韧带样纤维瘤(desmoid fibromatosis,DF)的疗效和安全性。方法:收集2017年10月至2020年9月就诊于四川大学华西医院的复发性或进展性韧带样纤维瘤患者37例,接受靶向药物阿帕替尼治疗,起始剂量250 mg...目的:分析阿帕替尼治疗复发性和进展性韧带样纤维瘤(desmoid fibromatosis,DF)的疗效和安全性。方法:收集2017年10月至2020年9月就诊于四川大学华西医院的复发性或进展性韧带样纤维瘤患者37例,接受靶向药物阿帕替尼治疗,起始剂量250 mg/d,根据药物不良反应调整剂量。结果:无完全缓解病例,17例(45.9%)为部分缓解,18例(48.6%)为疾病稳定,2例(5.4%)为疾病进展,客观有效率为45.9%,疾病控制率为94.6%。患者的关节活动度(rang of motion,ROM)、视觉模拟评分(visual analog scale,VAS)、上肢功能评定表(disabilities of the arm,shoulder and hand,DASH)评分、髋关节Harris评分及美国特种外科医院(HSS)评分均较治疗前有明显改善,且差异具有统计学意义(P<0.05)。常见的不良反应为手足综合征(37.8%)、胃肠反应(29.7%)和月经紊乱(21.6%)。结论:靶向药物阿帕替尼对复发性和进展性DF有一定的疗效,且不良反应可耐受,可作为复发性和进展性韧带样纤维瘤治疗的新途径。展开更多
文摘Internode number and length are the foundation to constitute plant height, ear height and the above-ground spatial structure of maize plant. In this study, segregating populations were constructed between EHel with extremely low ear height and B73. Through the SNP-based genotyping and phenotypic characterization, 13 QTL distributed on the chromosomes (Chrs) of Chr1, Chr2, Chr5-Chr8 were detected for four traits of internode no. above ear (INa), average internode length above ear (ILaa), internode no. below ear (INb), and average internode length below ear (ILab). Phenotypic variation explained (PVE) by a single QTL ranged from 6.82% (qILab2-2) to 12.99% (qILaa5). Zm00001d016823 within the physical region of qILaa5, the major QTL for ILaa with the largest PVE was determined as the candidate through the genomic annotation and sequence alignment between EHel and B73. Product of Zm00001d016823 was annotated as a WEB family protein homogenous to At1g75720. qRT-PCR assay showed that Zm00001d016823 highly expressed within the tissue of internode, exhibiting statistically higher expression levels among internodes of IN4 to IN7 in EHel than those in B73 (P Zm00001d016823 might provide novel insight into molecular mechanism beyond phytohormones controlling internode development in maize.
文摘Wild relatives possess potential genetic diversity for maize (<i><span style="font-family:Verdana;">Zea mays</span></i><span style="font-family:Verdana;"> L.) improvement. Characterization of maize-</span><i><span style="font-family:Verdana;">mexicana</span></i><span style="font-family:Verdana;"> introgression lines (ILs) is of great value to diversify the genetic base and improve the maize germplasm. Four maize-</span><i><span style="font-family:Verdana;">mexicana</span></i><span style="font-family:Verdana;"> IL generations, </span><i><span style="font-family:Verdana;">i.e.</span></i><span style="font-family:Verdana;"> BC1, BC2, BC3, and RIL, were constructed under the elite inbred background of 48-2, elite inbred line that is widely used in maize breeding in Southwestern China, and were phenotyped in different years and genotyped with 56110 SNPs. The results indicated that 48-2 had higher phenotypic performances than all the characterized ILs on most of the agronomic traits. Compared with other ILs, BC2 individuals exhibited more similar performance to 48-2 on most traits and possessed the highest kernel ratio (66.5%). Population structure and principal component analysis indicated that BC3 individuals gathered closer to 48-2 and exhibited the lowest </span><i><span style="font-family:Verdana;">mexicana</span></i><span style="font-family:Verdana;">-introgression frequency (0.50%), while BC2 (29.06%) and RIL (18.52%) showed higher introgression frequency. The high level of genetic diversity observed in the maize-</span><i><span style="font-family:Verdana;">mexicana</span></i><span style="font-family:Verdana;"> ILs demonstrated that </span><i><span style="font-family:Verdana;">Z</span></i><span style="font-family:Verdana;">. </span><i><span style="font-family:Verdana;">mays</span></i><span style="font-family:Verdana;"> ssp. </span><i><span style="font-family:Verdana;">mexicana </span></i><span style="font-family:Verdana;">can serve as a potential source for the enrichment of maize germplasm.</span>
文摘目的:分析阿帕替尼治疗复发性和进展性韧带样纤维瘤(desmoid fibromatosis,DF)的疗效和安全性。方法:收集2017年10月至2020年9月就诊于四川大学华西医院的复发性或进展性韧带样纤维瘤患者37例,接受靶向药物阿帕替尼治疗,起始剂量250 mg/d,根据药物不良反应调整剂量。结果:无完全缓解病例,17例(45.9%)为部分缓解,18例(48.6%)为疾病稳定,2例(5.4%)为疾病进展,客观有效率为45.9%,疾病控制率为94.6%。患者的关节活动度(rang of motion,ROM)、视觉模拟评分(visual analog scale,VAS)、上肢功能评定表(disabilities of the arm,shoulder and hand,DASH)评分、髋关节Harris评分及美国特种外科医院(HSS)评分均较治疗前有明显改善,且差异具有统计学意义(P<0.05)。常见的不良反应为手足综合征(37.8%)、胃肠反应(29.7%)和月经紊乱(21.6%)。结论:靶向药物阿帕替尼对复发性和进展性DF有一定的疗效,且不良反应可耐受,可作为复发性和进展性韧带样纤维瘤治疗的新途径。
