玉米品种春播与夏播叶片出生与穗分化的关系

Study on Relationship between the Leaf Born and Spike Differentiation for Both Spring and Summer Sowed Maize Varieties

为了弄清不同玉米品种不同播种季节叶片出生与穗分化的关系,选择当前贵州主推的7个玉米品种为材料,研究了各品种春播、夏播的可见叶﹑展开叶﹑见展叶差等与穗分化的关系。结果表明,7个品种同一播期雄穗、雌穗各分化期的可见叶、展开叶、见展叶差相差不大;同一品种雄穗各分化期春播的可见叶﹑展开叶数都少于夏播的。在雄穗生长锥未伸长期和生长锥伸长期各品种春播的见展叶差小于或等于夏播的,到小穗分化期之后春播的就大于或等于夏播的。在雌穗各分化期,春播的可见叶数与夏播的大致相等。在雌穗小花分化期以前,春播和夏播的展开叶数基本是相同的,在小花分化期和性器官成熟期,春播比夏播的多1～3叶。见展叶差在雌穗小穗分化期之前各品种春播的大于或等于夏播的,在小花分化期之后春播的小于或等于夏播的。

7 maize varieties popular in Guizhou province were selected to study the relationship between the number of visible leaves,expanded leaves,difference of visible leaves and expanded leaves with spike differentiation of the spring and summer sowed maize.The result showed that there was no significant difference in the number of visible leaves,expanded leaves,difference of visible leaves and expanded leaves while the seven varieties were sowed at the same time.The summer crop had more visible leaves and expanded leaves at the stage of male spike.The summer crop had same or less visible leaves and expanded leaves at the stage of elongation of growth cone.The spring crop had same or more visible leaves and expanded leaves after the stage of spicule differentiation.There was similar number of visible leaves between spring and summer crop at the stage of female spike differentiation,and similar number of expanded leaves before the spikelet differentiation stage.The spring crop had 1~3 more expanded leaves than summer crop at the stage of floret differentiation and genitals maturity.The spring crop had same or more visible leaves and expanded leaves before the stage of female spicule differentiation,and became same or less after then