根瘤線蟲Meloidogyne incognita對薑之致病過程研究
Other Title
Pathogenesis of Meloidogne incognita to Edible Ginger
Journal
中華農業研究
Journal Volume
28
Journal Issue
2
Start Page
91
End Page
99
Date Issued
1979-06-05
Date
1979-06-05
Author(s)
程永雄
杜金池
Y.H. Cheng
C.C. Tu
Abstract
根瘤線蟲（Meloidogyne incognita）侵入薑塊莖後不形成明顯之腫瘤。第2 齡幼蟲自塊莖鱗片狀葉著生處內側侵入，使鄰近之細胞產生褐色壞疽，降低生薑之市場價值。第2 齡幼蟲也從根冠附近侵入根系（鬚根及肉質根），遂移動到維管束附近攝食，生長並剌激形成不正常組織，包括細胞增生及巨型細胞等，產生肉眼可視別之腫狀根瘤。在30℃土壤溫度下，該線蟲在薑根系完成一世代須21 天，但在塊莖則要40 天。侵染根系之雌蟲成熟後釋放卵塊到根部外面，為塊莖及根系的第二次侵染源。塊莖內之成熟雌蟲僅能在塊莖內部維管束附近生產卵塊，而未釋至土內，致使大部份孵化之2 齡幼蟲侷限在病患處。
The second-stage larvae of Meloidogyne incognita enter the ginger rhizome through the axil of leaf sheath at the shoot apex, resulting the appearance of extensive internal lesions. No visible galls are formed on the infected rhizome throughout the entire period of pathogenesis. The lervae infect root system, including fibrous and fleshy roots, at the root-tip rigions. They penetrate through epidermis and cortex, and aggregate at vascular tissues (stele). As the results of nematode feeding, histological changes, such as formation of giant cells, hyperplastic parenchyma and abnormal xylem, are stimulated. Subsequently, externally visible galls are formed.
The nematode takes 21 days to complete the life cycle in fibrous and fleshy roots, but requires 40 days in rhizomes at 30°C soil temperature. Mature females release egg masses into the soil from diseased fibrous roots to serve as the main source of secondary inoculum. On the other hand, the mature females in diseased rhizome lay egg masses only in the diseased tissues, and thus, the second-stage larvae are limited in there.
Publisher
農業試驗所
Type
journal article
File(s)![Thumbnail Image]()
Loading...
Name
journal_arc_28-2-5.pdf
Size
7.44 MB
Format
Adobe PDF
Checksum
(MD5):00f78df93559269c81f2366c5ff9f4b4