适合中国南方生态区玉米优良群体的创建与改良

在基础群体BC₄中输入热带血缘,创建了适合中国南方生态区的玉米优良群体BCC₀,采用S₁法对BCC₀进行一轮改良得到改良群体BCC₁.在产量等11个农艺性状上,BCC₁比BCC₀,BCC₁、BCC₀比BC₄均有明显改善.BCC₁在产量等主要农艺性状一般配合力效应上具有

Establishment and Improvement of Maize Excellent Population Suitable for South Ecosystem Areas in China

Maize excellent population BCC₀ suitable for South ecosystem areas in China was established through joining tropical germplasms to basic population BC₄,maize improvement population BCC₁ was established through improving population BCC₀ by S₁ method.BCC₁ was better than BCC₀ or BC₄ in 9 agronomic traits much as yield.There is certain hereditary benefit in main agronomic characters general combining ability effect such as yield in BCC₁.The variances of 3 populations have no changes in 8 characters such as yield.It indicates that hereditary base didn't change to narrow.The main agronomic traits of population BBC₁ and BCC₀ have no epistasis effect and they were major influenced by general combining ability.It was valid to take S₁ method improvement.