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用光学显微镜和扫描电子显微镜观察水稻广二104、桂朝选两个品种(系)不同粒位小穗分化进度的差异,并研究其与籽粒性状的关系。结果发现直接着生在一级枝梗上的小穗分化顺序有多种类型,而这两个品种(系)主要属于6→5→4&1→3→2。最低位小穗(下称基小穗)比最高位小穗(下称顶小穗)分化早、粒大、结实率高、粒重较重,两者间的 t 值达到极显著的水准。位于内稃两内侧的雌蕊原基出现最早,而位于外稃中轴的分化最迟,在它出现后,浆片原基微突,这些与前人的研宄结果不同。并讨论了它在水稻育种工作中的应用价值。
The difference of the progress of spikelet differentiation between two rice cultivars (lines) Guanggu 104 and Gui Chaosuan was observed by light microscopy and scanning electron microscopy, and the relationship between them and grain traits was also studied. The results showed that there were many types of spikelet differentiation directly on primary branchlets, while the two cultivars mainly belonged to 6 → 5 → 4 → 1 → 3 → 2. The lowest spikelet (hereinafter referred to as basal spikelet) than the highest spikelet (hereinafter referred to as the top spikelet) early differentiation, grain size, high seed setting rate, heavier grain weight, the t value between the two reached a very significant level. The pistil primordium located in the medial and lateral pialid medulla had the earliest appearance, while the lateral axis of the pistil was the most differentiated. After it appeared, the ploidy primordium was slightly different from those of the previous study. And discussed its application in rice breeding.