Analysis of Combining Ability of Elite Quality Protein Maize Inbreds for the Main Agronomic Characters

摘要

The narrow genetic base and soft-endosperm kernel of quality protein maize (QPM) are the main constraints for QPM breeding in China. In order to enhance and improve the existing Chinese QPM germplasm, it is necessary to introduce and utilize exotic tropical and subtropical QPM germplasm in temperate maize breeding programs. The combining ability and hereditary parameters were analyzed in nine elite QPM inbreds (four tropical and five temperate) for the major agronomic characters. The nine elite QPM inbreds were diallel crossed by the Griffing Ⅳ design, and the 36 crosses were evaluated in three environments ( Kunming, Baoshan and Dehong) in Yunnan. The results indicated that tropical hard endosperm QPM germplasm from CIMMYT can be used effectively to overcome the ongoing problems associated with temperate soft-endosperm opaque-2 germplasm. The study provided valuable information for enhancement and improvement of QPM germplasm in Yunnan.