Pob43玉米群体的适应性改良

Adaptability Improvement of Pob 43 Maize Populations

Pob43玉米群体在太原生态环境条件下具有较强的光周期敏感性,表现为成熟期过晚,植株高大,叶片数增多,叶面积增大,抽雄、散粉、吐丝期推迟,导致空秆率高,结实性差,植株、穗部性状明显劣于温带对照品种。用控制双亲的混合选择法进行适应性选择后,Pob43群体的植株性状和雌雄协调性有所改善,子粒产量有所增加。研究结果表明,控制双亲的混合选择法是改良热带和亚热带玉米种质在温带长日照条件下适应性、提早开花及改善雌雄协调性的有效途径。

Compared with temperate control hybrids,the populations performed later maturity,higher plant,more leaf,bigger leaf area,and leater heading.In conclution,Pob43's agronomic trait and fertility are poorer than those controls.Fertility and plant figure and harmany between male and female are improved after it was selected adaptively by mix-selecting of controlling parents.The results showed that it is an effective technique of improving adaptability of tropic and subtropic maize grmplasm under long-sunlight and a valid route of bloom ahead and reforming harmony between male and female.