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穗下节间长决定着玉米的穗位高和株高,而株高和穗位高与产量、抗倒伏性等重要农艺性状密切相关。玉米穗下第7、第8、第9节间长对穗位高具有决定作用,与其他农艺性状相比,对穗下节间长的遗传基础了解甚少。因此,研究玉米穗下节间长的遗传基础,对玉米育种有重要意义。本研究以lx9801为受体亲本,昌7-2为供体亲本通过连续回交和自交所构建的一套包含260份染色体单片段代换系的群体为研究对象,通过两年两环境的表型鉴定,并结合基因型数据对第7、第8、第9节间长和穗位高的QTL进行定位。共检测到18个第7节间长QTL,23个第8节间长QTL和17个第9节间长QTL,其中8个QTL是为第7、第8、第9节间长所共有。穗位高定位到的20个QTL中,有12个(60%)与第7、第8、第9节间长QTL共定位。说明第7、第8、第9节间长与穗位高有着共同的遗传基础,节间长也是穗位高的重要构成因子,决定着玉米的株高和穗位高。
The internode length of ear determines the ear height and plant height of corn, while the plant height and ear height are closely related to the important agronomic traits such as yield and lodging resistance. Under the ear of corn, the 7th, 8th and 9th length of the ear had a decisive role on the ear height. Compared with other agronomic traits, the genetic basis of the internode length under the ear was poorly understood. Therefore, studying the genetic basis of internodes under maize ears is of great significance to maize breeding. In this study, a population of 260 chromosome segments was constructed by continuous backcrossing and selfing in Chang 7-2 as the recipient parent, Chang 7-2, as the research object. After two years and two environments Phenotypic identification and genotypic data were used to map the QTLs for the 7th, 8th, and 9th nodes and the ear height. Totally 18 QTLs were detected in the 7th, 23th QTLs and 17th QTLs among them, of which 8 QTLs were common to the 7th, 8th, and 9th nodes. Of the 20 QTLs mapped to panicle, 12 (60%) were co-localized with QTLs 7, 8 and 9. The results showed that there was a common genetic basis between the length of the 7th, the 8th and the 9th of the ear and the height of the ear. The length of the internode was also an important component of the ear height, which determined the plant height and ear height of the corn.