摘要
用双目解剖镇及扫描电子显微镜对第一苞原基与剑叶原基的形态作了观察比较，确认在剑叶原基高于生长锥顶部之前，两者在形态上没有什么区别。分析了当前盛行的第一苞与生长锥中轴的夹角呈钝角、剑叶原基未超过生长锥顶部时分化的是第一苞原基等等鉴别标准不符合实际的原因，主要是忽视了水稻同一品种（组合）在相同条件的田块的植株群体内，各主茎的总叶数至少有n和n－1叶两种叶数的事实所导致。并提出丁颖等的幼穗发育8个时期的第一期应更名为苞分化期。苞分化期的起点是一、二苞原基出现，接着是三、四…苞原基出现，终点在一次枝梗原基出现之前。一次枝梗原基出现为第二期的起点。此结果使丁颖等稻穗发育刚开始时期的鉴定标准具有可操作性，使幼穗发育期全长及8个时期各期的起点、终点都有了明确的界限。
Comparing the morphology of the first bract and flag leaf primordium by binocular dissecting micro scope and scanning electronic microscope (SEM), no any difference is observed. The prevailing views that first bract holds an obtuse angle (the angle between the first bract and axis of apical cone is larger than 90°)is not true,and that when the first bract primordium appears the flag leaf primordium does not grow over the apical cone is not true too. These mistakes are caused by neglecting the fact that there are at least two kinds of leaf number of main culm (n and n-1)in the same variety and the same plot. The name of the first stage of panicle development should be changed into bracts differentiating stage. The beginning of this stage is the appearing of the 1st and 2nd bract primordium(Fig. 4 & 6). Then,the third,fourth...bract primordium follows until the primary branch primordium appears. The appearing of primary branch primordium starts the second stage of panicle development (Fig. 5). This conclusion makes the discriminating standard of the beginning feature of 8 stages of rice panicle development to be practicable.
出处
《中国水稻科学》
CAS
CSCD
北大核心
1997年第1期16-20,共5页
Chinese Journal of Rice Science
关键词
水稻
穗分化
形态特征
panicle differentiation
panicle development
panic1e morphogenesis
remainder leaf number
