摘要
对苏麦三号、新中长、东海63和农林61等4个品种36个接种小穗的石蜡切片,进行显微镜观察。结果指出,小麦赤霉病菌可以菌丝直接侵入颖片或花药表皮,也可以通过花药的自然裂口侵入。最先侵染的部位是花药,其次为颖片内侧壁及小穗基部缝隙内的组织。观察表明,病菌首先侵染花药,然后横向扩展侵染靠近花药的颖片内侧壁,及垂直向下蔓延至子房的侵染方式占31个,是典型的侵染过程。研究结果还指出,病害在小穗内的发展,由于颖片对病茵扩展的阻隔作用,垂直扩展快于横向扩展,造成小穗的半病半健状况。
The spikes of Su-Mai No.3, Xin-Zhong-Chang, Dong-Hai No. 63 and Nong-Ling No.61 were inoculated with spore suspension at flowering stage. The spikes samples at 20, 44 and 96～98 h after inoculation wereimmediatly fixed in F. A. A. Then wax-slices were made and observed with a microscope. The observation results indicated that the fungus of wheat scab penetrated directly external epidermis of anther and internal epidermis of flume. Also the fungus invaded into anther tissues cracked naturally. Observation of 36 spikelets showed in most cases (31 of 36 samples) the anther was infected at first, and then spread to epidermis of flume (horizotal spread) and ovary (vartical spread)which was mainly infection process. Usually, vartical spread was quicker than horizotal one, because the glume inhibit the horizotal development of fungus. Thus, spikelets which were partially infected and partially uninfected were found.
出处
《南京农业大学学报》
CAS
CSCD
北大核心
1989年第3期33-38,共6页
Journal of Nanjing Agricultural University
关键词
小麦赤霉病菌
侵染过程
Wheat scab pathogen
Infection process
