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当前位置: 首页 > 文章 > 南方根结线虫侵染黄瓜幼根组织病理学观察 中国农业大学学报 2008,13 (4) 57-62
Position: Home > Articles > Histopathological structure of cucumber radicle infected by root-knot nematode Journal of China Agricultural University 2008,13 (4) 57-62

南方根结线虫侵染黄瓜幼根组织病理学观察

作  者：
刘奇志;李娜;王丽;谢德燕
单  位：
中国农业大学生物学院;中国农业大学农学与生物技术学院
关键词：
黄瓜;南方根结线虫;根结;巨型细胞;维管组织;病理结构
摘  要：
人工接种南方根结线虫(Meloidogyn incognita),观察不同侵染时间黄瓜根部组织的病理特征。结果显示:接种后6 d的根尖分生区、伸长区出现膨大、对称的根结,根中心的原形成层细胞分化出巨型细胞;10 d在根毛区及以上部位出现既有对称又有偏于一侧的根结,周围有原生木质部导管出现,根结中巨型细胞阻断了导管;16 d次生维管组织提早出现;20~30 d导管纵向排列无序,形状扭曲,皮层中有新维管组织产生。总之,随侵染时间的延长,根部受害部位逐渐由内皮层扩展至皮层,根结逐渐由巨型细胞、提早形成的次生维管组织以及皮层中的新维管组织共同形成;导管逐渐受阻,排列扭曲无序。
译  名：
Histopathological structure of cucumber radicle infected by root-knot nematode
作  者：
LIU Qi-zhi1,LI Na1,2,WANG Li2,XIE De-yan1 (1.College of Agronomy and Biotechnology,China Agricultural University,Beijing 100193,China;2.College of Biological Science,China Agricultural University,Beijing 100193,China)
关键词：
cucumber;root-knot nematode;root-knot;giant cell;vascular tissue;pathological structure
摘  要：
Pathological features of a cucumber radicle tissue inoculated with root-knot nematodes(RKN,Meloidogyn incognita)were observed on different days.Six days after inoculation,the cucumber root tip was slightly swollen and symmetrical root-knots were observed at the meristematic and elongation zones.Giant cells were differentiated by previous cambium cells in the center of the root;10days after inoculation,symmetrical and secondary root-knots were observed at the root hair and upper zones.Vessels were separated by giant cells,around which protoxylem vessels were observed;16days after inoculation,hypo-vascular tissue appeared earlier than normal;20-30 days after inoculation,the vertical arrangement of vessels was disordered,shape was distorted and a new vascular tissue appeared in the cortex.With time after inoculation with RKN,the injured parts of the root tissue developed from endoderm to cortex;the root-knots were gradually formed by giant cells,earlier appeared hypo-vascular tissues and new vascular tissues in the cortex;vessels were suffocated gradually until they were disordered and distorted in shape.

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