糖類を消費したキュウリ葉上における Sphaerotheca fuliginea (Schlecht.) Pollacci の生育とそれに及ぼすしょ糖の影響

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Leaves cut from cucumber seedlings (0.7 leaf-stage) grown in the greenhouse, at 2 : 00 PM on a fine day (Feb. 1987), contained fructose (3.38 mM), glucose (3.25 mM) and sucrose (10.19 mM). When these seedlings were placed in a dark room for 24 hr, no carbohydrates were detected (carbohydrate free) in their leaves. Leaves of carbohydrate free cucumber seedlings, which were soaked in 2% sucrose solution for a subsequent 24 hr in the dark, contained 1.6 mM sucrose. Sucrose (4.5 mM), fructose (17.6 mM) and glucose (15.0 mM) were detected in them 48 hr after soaking. For cucumber leaves placed in the greenhouse, Sphaerotheca fuliginea (Schlecht.) Pollacci elongate hyphae 1592.9 μm in length (48 hr), formed 64.8 haustoria (96 hr), and 74.3 conidiophores per mm^2 (7 days) after inoculation, respectively. For leaves of carbohydrate free cucumber, S. fuliginea elongated the hyphae to 71.4 μm in length, and formed the first haustorium under the germ tube 24 hr after inoculation. However, further development of the fungus was arrested completely. On the other hand, the fungus developed further on the carbohydrate free cucumber leaves, which were soaked in 0.5, 1.0, 2.0 and 4.0 sucrose solutions in the dark, and formed 12.8, 21.6, 72.6 and 82.8 conidiophores per mm^2 7 days after inoculation, respectively.
日本植物病理学会の論文
1995-02-25