高粱幼穗分化与叶龄指数的关联研究

为明确高粱穗分化进程的简易叶龄诊断方法,该文以杂交种'晋渝糯3号'和常规种'国窖红1号'为供试材料,设置3个播期,观察幼穗分化进程及对应的叶龄,分析各分化阶段与叶龄及叶龄指数的对应关系.结果表明:(1)高粱幼穗分化过程可划分为5个时期(营养生长期、生长锥伸长期、枝梗分化期、小穗小花分化期和雌雄蕊分化期),不育的有柄小穗...

Relationship between panicle differentiation and leaf age index of sorghum

In order to determine an easy leaf age(LA)diagnostic method of panicle differentiation stage of sorghum,the panicle differentiation of sorghum and the relationship between differentiation stage and LA and leaf age index(LAI)were investigated.Hybrid cultivar‘Jinyunuo 3’and conventional cultivar‘Guojiaohong 1’were used as materials planted in three sowing dates,the panicle differentiation stage and corresponding LA were recorded.The results were as follows:(1)The panicle differentiation could be divided into five stages,i.e.vegetative stage,elongation stage,panicle branch differentiation stage,spikelet and floret differentiation stage,gynoecium and stamen formation stage.The sterile spikelet with stalk could develop to gynoecium and stamen formation stage.(2)With the detention of sowing date,the starting date of panicle differentiation was advanced,and the growth duration shorted,and LA and LAI of each stage of panicle differentiation were decreased,but there were differences among varieties.(3)The relationship between the panicle differentiation stage and LAI conformed to linear regression correlation,with a formula of panicle differentiation stage(Y_i)to LAI(X_i)of Y_i=b X_i+a.(4)With the detention of sowing date,the parameter b and|a|in formula of‘Jinyunuo 3’were increased,while those of‘Guojiaohong 1’were decreased.To sum up,it is viable to infer panicle differentiation stage applying LAI,and the results provide theoretical basis for sorghum cultivation index management.