【摘要】 油菜 (BrassicanapusL .)花丝的输水系统由螺纹以及少量的环纹导管和管胞组成 ,它们随花丝的伸长而被拉长直至拉断。统计结果显示 ,花开放后 ,大量的导管和管胞被拉断。输水组织的断裂终止了连续水柱的形成 ,使水分运输的重要动力———蒸腾拉力和内聚力不能发挥作用 ,引起了花丝组织的供水不足 ,在蒸腾失水不断加剧的外部因素的相互作用下 ,最终导致了花丝的枯萎。更多还原

【Abstract】 Withering mechanism in rape filaments was detected in this note by anatomical method.The result showed that the water transport was conducted by spiral,with few annular,vessels and tracheids,which were elongated and broken as the extension of filaments.Statistical analysis revealed that the greater part of the vessels and tracheids in filaments were broken after bloom,and resulted in the breaking of the continuous water column in the transport tissue and made the main powers (transpiration pull and coherence) for water transport ineffective.In consequences,the filaments could not get enough water,finally resulting in the perishing of filaments.更多还原