棉花枯萎病菌侵染棉籽途径的研究Ⅱ.从花器系统侵染棉籽的途径

STUDIES ON PATHWAYS OF INFECT COTTON SEED BY Fusarium oxysporum Schl. f. sp Vasinfectum (Atk.) Snyder et Hansen Ⅱ.INFECTING COTTON SEED THROUGH FLOWER ORGAN SYSTEM

研究证明：在人工花器接种的条件下，棉花枯萎病菌可以通过花器侵入，导致棉籽带菌；封花试验研究表明在自然条件下，重病田中存在棉花枯萎病菌孢子经气传从花器侵入引起棉籽带菌的可能性。通过扫描电镜观察人工花器接种后的花柱、花丝等部位，可看到病菌萌发侵入的情况。

The result of our research showed that Fusarium oxysporum could infect cotton seed through flower organ under the condition of artificial inoculation. The experiment of sealed flower showed that it was possible that the conidium of Fusarium oxysporum could infect cotton seed through flower organ by air in the seriously infected field. The germination and invasion of conidium could be observed on the surface of the flowers by SEM. The germinating conidium and invading hyphae could also be observed inside them by SEM.