Some Observations on the Relation between the Penetration Hypha and Haustorium of the Barley Mildew (Erysiphe graminis) and the Host Cell:(II). On the Collapse of Mesophyll Cells of the Barley Leaves attacked by the Mildew
スポンサーリンク
概要
- 論文の詳細を見る
This paper reports some observations on the death of mesophyll-cells in barley leaves infected with the powderly mildew, which is an epidermal cell invading parasite.1. In the case of the resistant varieties of barley, (a) a few days after inoculation, some of the mesophyll-cells beneath the epidermal cell, in which the first haustorium is formed, are observed to be dead. As the days go on, death of the mesophyll-cells extends sometimes to those which are not directly in contact with the haustorium-bearing cell.(b) The chloroplasts in the dying mesophyll-cell become smaller in size and in number, often all of the chloroplasts and the nucleus becoming unrecognizable. Then the mesophyll-cell loses turgidity. The dead mesophyll-cells may be strongly browned or remain unchanged.(c) Death of the mesophyll-cells occurs while the epidermal cell above them is living and being absorbed nutriments by the haustoria. When the epidermal cell dies soon after the penetration hypha of the fungus intrudes or swells into a primordial haustorium, no mesophyll-cells beneath the dead epidermal cell are collapsed.(d) When a greater percentage of the mesophyll-cell beneath a haustorium-bearing epidemal cell die, the fungal development is checked, giving an impression that death of the mesophyll-cell is the cause of resistance of the barley leaf to the powdery mildew. The hyphal cells are, however, not rarely observed to be dead or dying, while no mesophyll-cells are dead or only a few mesophyll-cells among many ones attaching to a haustorium-bearing epidermal cell are dead. In such cases the haustorium may be in difficulties to absorb nutriments from the epidemal cell, antecedent to the death of the mesophyll cells underneath.2. In the case of the susceptible varieties, the mesophyll-cells apart from the pustule portion become chlorotic, while those beneath the pustule are green and apparently not so much disturbed. And the mesophyll-cells begin to die from the farthest ones from the pustule.3. There is an opinion that mesophyll-cell death of the resistant barley leaf is due to a toxin secreted by the haustorium, but such a substance is not yet proved. It may be possible to suppose that the mesophyll cell dies as a result of being suddenly deprived of its nutriments by the haustorium-containing epidermal cell. The phenomenon that the mesophyll-cells distant from the pustule portion, in the case of the susceptible varieties, die while those under the pustule are alive, may be also interpreted by one-sided translocation of nutriments toward the pustule-bearing part.4. Both in susceptible and resistant varieties of barley, the first haustorium is developed far more easily in the auxiliary cell than in the common epidermal cell. It is worthy of mentioning that the the auxiliary cell is not directly in contact with the mesophyll-cell.
- 日本植物病理学会の論文
日本植物病理学会 | 論文
- 育苗圃におけるイチゴ炭疽病の潜在感染率の推移と発病との関係(関東部会講演要旨,平成18年度地域部会講演要旨)
- (171)北海道の田畑輪換圃場を利用したイチゴリレー苗生産におけるColletotrichum gloeosporioidesの潜在感染とその病原性(平成14年度 日本植物病理学会大会講演要旨)
- (170)北海道の田畑輪換圃場を利用したイチゴリレー苗生産による炭疽病・萎凋病の防除(平成14年度 日本植物病理学会大会講演要旨)
- (47) Alternaria alternataの形質転換体における外来遺伝子の増幅 (平成2年度大会講演要旨)
- (8) 相同的組み換えによるAlternaria alternataの形質転換と形質転換体における外来遺伝子の安定性 (関西部会講演要旨)