【摘要】 小麦穗轴内有中央维管束和周缘维管束两个相对独立的系统。中央维管束贯穿于穗轴各节片,而周缘维管束是不连续的。中央维管束和周缘维管束的数量均随穗轴节位的上升而减少,减少的速度越快,则进入相应小穗的维管束越多。穗轴中部小穗轴中的维管束分化较基部和顶部小穗轴早,其维管束的数量多,木质部的面积也大。因此,小麦穗轴内维管束的分配差异是穗器官发育不均衡的重要原因。更多还原

【Abstract】 There were two relative independent vascular systems in the rachis of wheat spike—peripheral(PVB)and central vascular(CVB)bundles, the CVB system was a successive system, but the PVB system was not. It was observed that the number of both TVBand CVB declined from the base to the top of the rachis. The greater the rate of CVB number declined, the more the CVB entered the attached spikelet. The vascular differentiation of the middle rachises was earlier than that of the basal and disia ones, its VB number was great and the xylem area was larger. It was concluded that the different distribution of VB in the internodes of raches was a main reason of the unbalaeed development of wheat spike organs.更多还原