染色体片段导入系在作物遗传育种研究中的应用

染色体片段导入系是在轮回亲本的遗传背景上只含有一个或少量供体染色体片段的家系,可作为QTL分析的重要材料。在QTL检测时,染色体片段导入系的遗传背景清楚,可有效检测微效基因及隐蔽基因,准确地评价供体染色体片段的遗传效应,打破优良基因与不良基因的连锁,提高QTL检测的效率和准确性。另外,染色体片段导入系不仅可用于QTL精细定位和基因克隆、QTL间互作、QTL与环境互作以及杂种优势的研究,同时还可用于作物聚合育种和分子设计育种。本文对染色体片段导入系的构建及其在作物遗传育种中的应用进展进行了综述。

Application of Chromosomal Segment Introgression Line (CSIL) in Crop Genetics and Breeding

Chromosomal segment introgression (or substitution) lines (CSILs or CSSLs) are defined as a set of lines each of which contain only one or few chromosomal segment from the donor and genetic background of each line is similar to receptor. Compared with the traditional mapping populations, the CSILs might have a vast variety advantage for identifying of quantitative trait loci (QTL) due to eliminating of residual background which can lead to decrease power of QTL detecting. Therefore, population of CSIL is one of the ideal materials for QTL identifying and fine mapping, assay of QTL interaction and QTL ?environment interaction, as well as for heterosis utilization and QTL pyramiding. In this paper, the advanced progresses on the construction and application of CSIL population in crop plants were reviewed.