THE ATTACHMENT ORGAN OF THE PARASITIC ANGIOSPERMS OROBANCHE CUMANA AND O-AEGYPTIACA AND ITS DEVELOPMENT
THE ATTACHMENT ORGAN OF THE PARASITIC ANGIOSPERMS OROBANCHE CUMANA AND O-AEGYPTIACA AND ITS DEVELOPMENT
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DOI：
10.1139/b94-075
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发表时间：
1994-05-01
期刊：
影响因子：
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通讯作者：
LOSNERGOSHEN, D
中科院分区：
文献类型：
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作者：
JOEL, DM;LOSNERGOSHEN, D
一些种类的orobche是寄生杂草，攻击各种作物的根部并造成广泛的损害。利用光镜和电镜观察了幼虫的发育情况。发芽的埃及稻和古巴稻形成一个短根，没有根冠，根冠被一层薄薄的角质层覆盖。一旦根到达寄主，伸长停止，顶端扩张，周围细胞变成乳头状。伸长的先端成为幼芽的附着器官。延长先端的外乳头表面有壁状突起，壁状突起被一厚角质层带包围并被一薄角质层覆盖。这些突起分泌一种碳水化合物，这种碳水化合物积聚在皮下空间并被释放到表面，形成一层薄薄的黏附层，将寄生虫与宿主结合在一起。细菌通常存在于分泌物池、乳头和外细胞壁上。幼虫附着于寄主表面标志着从独立阶段向寄生阶段的转变。这种变化还包括从脂质积累到淀粉积累的转变。
Some species of Orobanche are parasitic weeds attacking the roots of various crops and causing extensive damage. The development of the young parasite was investigated using light and electron microscopy. Germinating O. aegyptiaca and O. cumana form a short root, with no root cap, which is covered by a thin cuticle. As soon as the root reaches a host, elongation stops, the apex expands, and peripheral cells become papillate. The extended apex becomes the young attachment organ. The outer papillar surface of the extended apex bears wall protuberances that are encircled with a thick cuticular belt and covered with a thin cuticle. These protuberances secrete a carbohydrate that accumulates in a subcuticular space and is released to the surface, forming a thin adhesive layer that binds the parasite to its host. Bacteria are commonly found in the secretion pool, on the papillae, and in the outer cell walls. The event of attachment of the young parasite to host surface signals a shift from the independent to parasitic phase. This change also includes a shift from the accumulation of lipids to the accumulation of starch.