Japanese Journal of Phytopathology

On the pathological Histology of hypertrophied Leaves of Camellia Sasanqua caused by Exobasidium Camelliae var. gracilis

Shigeyasu AKAI

1939 Volume 9 Issue 2 Pages 61-68_1
Published: 1939
Released on J-STAGE: April 03, 2009

DOIhttps://doi.org/10.3186/jjphytopath.9.61

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The writer has made an investigation on the histology of hypertrophied leaves of Camellia Sasanqua THUNB. caused by Exobasidium Camelliae SHIRAI var. gracilis SHIRAI.
The hymenium of the causal fungus developing usually on the under surface of the affected leaves appears at first in the intercellular spaces of the mesophyll and is covered with two to seven layers of cells under the epidermis. The overlying tissue ruptures, with the maturity of the hymenium, becoming a membranaceous piece, which usually remains attached to the margin of the leaf (Fig. 2).
Both hypertrophy and hyperplasia, inducing the changes in the proper arrangement of cells, occur in the affected leaves and consequently various layers of cells lose their individuality. The changes in the arrangement of cells in the pathological tissue are recognized partially to be caused by osmotic pressure.
The new formation of such vascular bundles, as found in the cortex of hypertrophied buds of Camellia japonica, is not discovered in the affected leaves by the present disease, but some of the endings of the vascular bundles extend towards the hymenium of the causal fungus (Plate III, E). This mechanism also seems to serve for the nutritionsupply of the host to the causal fungus.

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Phytophthora Blight of Hibiscus Manihot

H. TASUGI, Y. IKEDA

1939 Volume 9 Issue 2 Pages 69-85
Published: 1939
Released on J-STAGE: April 03, 2009

DOIhttps://doi.org/10.3186/jjphytopath.9.69

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The Phytophthora blight of Hibiscus Manihot has been known for several years at In'nosima, Hirosima Prefecture. In 1936, one of the writers has collected the specimens of the diseased plants and since then the disease has been studied.
The blight attacks leaves, stems and roots. At first the disease appears as a dull green, round patch which spreads to all parts of the plant, turning them brown finally.
Morphology of the fungus: The sporangia are produced both on the diseased portions and the culture media. They are ovoid or pear-shaped, and hyaline with typical papilla. Their size measure 18.0-45.1×10.7-35.9μ, in average 29.29×21.70μ the ratio, length/width being 1.35. Under favorable condition, the sporangia germinate in general indirectly, producing zoospores, though they will germinate directly under high temperature. Chlamydospores are produced terminally or intercalary. They are spherical, yellowish with thick walls, measuring in diameter 18.0-50.3μ, in average 30.29μ. Oogonia are spherical and hyaline. They measure in diameter 19.0-36.6μ and 15.2-28.7μ on host plant and oatmeal agar respectively. Antheridia are amphigynous, hyaline and irregular in shape. Oospores are spherical and yellowish, with thick walls, measuring 12.6-25.0μ, in diameter.
Physiology of the fungus: The fungus grows well on several culture media, such as corn-meal-, oat-meal-, bean-, and potato agar. Other culture media are quite unfavorable for its growth. It grows at the temperature between 6-37°C. Its growth is best at pH 5.8-6.7, and no growth is seen at pH 3.8.
Inoculaiton experiments: The manihot plants are readily infected when it is inoculated with mycelia and spores. Many kinds of plants, such as tomato, potato, cotton, egg-plant, broad bean are also attacked. It is noteworthy that the tobacco plant is not at all infected, and that the leaves and fruits of the red pepper are readily attacked.
On basing on comparative studies with several Phytophthora species previously described concerning their morphology and physiology, the writers think that the manihot Phytophthora corresponds to P. parasitica which is described by REINKING and SCHWARZ to attack Hibiscus sabdariffa.

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The Profile of American and European Plant Pathologists-1

K. TOGASHI

1939 Volume 9 Issue 2 Pages 86-92
Published: 1939
Released on J-STAGE: April 03, 2009

DOIhttps://doi.org/10.3186/jjphytopath.9.86

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Some of the physical and chemical differences found in the inner and outer halves of a leaf blade of rice in relation to rice blast

H. YOSHII

1939 Volume 9 Issue 2 Pages 93-96
Published: 1939
Released on J-STAGE: April 03, 2009

DOIhttps://doi.org/10.3186/jjphytopath.9.93

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On the Inclusion Bodies associated with the “Shimahagare” Disease of Rich Plant

I. KAWAI

1939 Volume 9 Issue 2 Pages 97-100
Published: 1939
Released on J-STAGE: April 03, 2009

DOIhttps://doi.org/10.3186/jjphytopath.9.97

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Experiments on Seed Transmission of Lily Mosaic

H. TASUGI, S. IKENO

1939 Volume 9 Issue 2 Pages 101-104
Published: 1939
Released on J-STAGE: April 03, 2009

DOIhttps://doi.org/10.3186/jjphytopath.9.101

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[title in Japanese]

1939 Volume 9 Issue 2 Pages 111-120
Published: 1939
Released on J-STAGE: April 03, 2009

DOIhttps://doi.org/10.3186/jjphytopath.9.111

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[title in Japanese]

1939 Volume 9 Issue 2 Pages 121-129
Published: 1939
Released on J-STAGE: April 03, 2009

DOIhttps://doi.org/10.3186/jjphytopath.9.121

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[title in Japanese]

1939 Volume 9 Issue 2 Pages 129-141
Published: 1939
Released on J-STAGE: April 03, 2009

DOIhttps://doi.org/10.3186/jjphytopath.9.129

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