臺灣蕃茄簇葉病之研究(I). 嫁接傳染與電子顯微鏡觀察

Other Title
STUDIES ON TOMATO WITCHES ROOM IN TAIWAN (1). GRAFT TRANSMISSION AND ELECTRON MICROSCOPIC OBSERVATON
Journal
植物保護學會會刊
Journal Volume
20
Journal Issue
4
Pages
360-365
ISBN
0577-750X
Date Issued
1978-12
Date
1978-12
Author(s)
楊一郎
陳脈紀
I.L. Yang
M.J. Chen
URI
Abstract
臺灣之蕃茄簇葉病於1975年在臺南發現，本病在臺灣尚未見有報告，病徵為花器葉化，花梗異常肥大伸長而直立叢生，葉化花異常分糵而簇生小葉形成帚狀分枝，其病徵近似Tomato big-bud或Tomato “Mal Azul”，病株可生長少數畸形果，惟少有結實。本病可經嫁接傳染，而其嫁接傳染發病潛伏期在35至55天。 本病病株之葉脈組織經超薄切片，電子顯微鏡觀察結果，在病組織之篩管細胞內發現多形性凝菌質體(Mycoplasma-like organism)之存在，凝菌質體直徑約為40-70nm，其形態大小及存在位置與其他已知簇葉病所發現之擬菌質體相類似，該項凝菌質體可能為本病病原。 Tomato witches’broom was first recognized by the senior author in Tainan district, Taiwan in 1975, and it was a newly recorded disease in this island. The diseased plants showed enlarged calyxes of flowers, abnormal upright-growing phylloid blossoms, abnormal little leaves and conical shoots growing from the crowded phylloid blossoms. There were few woody fruits, and the seeds were sterile. These disease symptoms resembled somewhat to those of big-bud, and of ’Mal Azul’ diseases in tomatoes. The vector was not known, but the infectious agent could be transmitted by grartting to healthy tomatoes, and the incubation period by grafting ranged from 35 to 55 days. Electron microscopic examination made on thin-sections of tomato infected with witches’broom revealed the presence of pleomorphic bodies of Mycoplasma-like organism in the sieve tubes of diseased leaf tissues. Size of these bodies ranged from 40 to 740nm in diameter. Since morphology and localization of these bodies were similar to those of Mycoplasma-like organisms found previously elsewhere in witches’broom diseases, these pleomorphic bodies seemed to be the causal organism of tomato witches’broom disease.
Publisher
植病保護學會
Type
journal article
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