大麦产量相关性状QTL热点区域研究

Review on hot-spot QTL associated with yield of barley

大麦是世界上第四大禾谷类作物,其产量性状为数量性状,许多与产量相关的QTL被定位。利用一致性图谱对大麦不同定位群体产量QTL进行整合,发现一些产量QTL聚集在半矮杆、光周期、春化作用和抗白粉病mlo基因区域,这些区域称为产量热点QTL区域。多数研究认为这些基因对大麦产量的影响主要是一因多效性。半矮杆基因对大麦生长发育有一定影响,光周期和春化作用是决定花期的重要因子。产量是贯穿大麦整个生长和发育进程的最终产物,因而这些重要基因对大麦产量产生直接或间接的影响。

Barley is the fourth most important cereal crop in the world. It was reported that barley yield is quantita- tive in nature and many yield QTLs have been identified in different populations. Based on the barley consensus map, its yield QTLs can be alignment from different mapping populations. The clustered QTLs in the semi-dwarf, photoperiod sensitivity, vernalization and powdery mildew resistance mlo gene regions reveals hot-spots for barley yield. Their effects on yield are commonly explained by pleiotropic effects. The semi-dwarf genes are involved in bar- ley development, while photoperiod and vernalizator are the key factors determining flowering time of barley. The fi- nal yield is the product of multiple growth and development processes that occur throughout the barley life cycle. That＇s why so many genes have direct and indirect effects on barley yield.