不同类型玉米品种果穗维管束结构的差异研究

［目的］研究不同类型玉米品种果穗维管束结构的差异。［方法］选用不同株型和穗型的3个玉米高产杂交种掖单4号、掖单13和沈单7号，利用徒手切片技术观察测定穗柄和穗轴内维管束的数目和面积，比较不同类型品种间果穗维管束的结构差异。［结果］在穗柄（轴）大维管束数、总维管束数、单个大维管束的平均面积、大维管束总面积、维管束总面积上，大穗型品种掖单13和沈单7号显著优于小穗型品种掖单4号；在维管束密度及维管束相对面积上，紧凑型品种掖单4号和掖单13大于平展型品种沈单7号；在维管束的输送效率上，掖单13略占优势，但品种间差异不显著。［结论］为今后玉米的高产栽培和品种选育提供理论依据。

Study on Difference of Ear Vascular Bundles Structure of Different Maize Types

Objective] The research aimed to study the difference of ear vascular bundles structure of different maize types.Method] Three three types of maize hybrids were chose as tested materials,namely Yedan 4,Yedan 13,and Shendan 7,corresponding to vertical-small-ear type,vertical-large-ear type and horizontal-large-ear type respectively.The number and area of vascular bundle,phloem and xylem,the number and diameter of vessel were measured using bare-handed sections.The quantity of bleeding sap from ear-stalk an...