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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Research in Plant Disease
Journal Basic Information
Journal DOI :
Korean Society of Plant Pathology
Editor in Chief :
Volume & Issues
Volume 1, Issue 3 - Sep 1985
Volume 1, Issue 2 - Apr 1985
Volume 1, Issue 1 - Jan 1985
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Histopathological Studies of Witches' Broom Infected Jujube Trees Treated by Oxytetracycline
Im Hyong Bin ; La Yong Joon ; Lim Ung Kyu ; Chang Tag Jung ; Shin Jai Doo ; Lee Soon Hyung ;
Research in Plant Disease, volume 1, issue 2, 1985, Pages 101~101
Histopathological changes in the witches''-broom mycoplasma (MLO) infected jujube trees after trunk injection of oxytetracycline HCl (OTC) solution were investigated by using light microscope, fluorescence microscope and electron microscope. In contrast to the healthy leaves, adaxial and abaxial bundle sheath extensions in the major veins of diseased leaves were highly developed, but mesophyll cells were very small, loose and necrosed. In the diseased leaves, excessive phloem was formed, xylem differentiation was supressed and polyphenols were accumulated. Jujube trees treated with 500ml of 2000ppm solution of OTC showed complete remission of witches''-broom symptoms above the injection site, but cells in the sheath extention were hypertrophied and sieve tube necrosis occurred in the secondary phloem of major veins. MLO-specific fluorescence was not observed in the samples of diseased jujube trees treated with OTC, while those from non-treated infectedstress distinctly showed a moderate amount of MLO-specific fluorescence. In the observation under the electron microscope, sieve element of diseased tissues and its associated companion cells were found to have collapsed. Parenchymas cells contained many large starch filled plastids and most samples of diseased and OTC-treated tissues showed an abnormal accumulation of starch compared to the healthy controls. Mycoplasma-like organisms were observed only within mature sieve elements in diseased tissues, but never in OTC-treated tissues.
Effect of Transplanting Dates on the Occurrence of Rice Stripe and Black-Streaked Dwarf Virus Diseases in Yeongnam District
Kim Dong Kil ;
Research in Plant Disease, volume 1, issue 2, 1985, Pages 109~109
The experiments were conducted to clarify the influence of transplanting date on the occurrence of rice virus in field condition of 1984. The rate of RBSDV (rice black-slreaked dwarf virus) viruliferous vector, smaller brown planthopper (Laodelphax striatellus Fallen), was shown to be
at the 2nd adult and that of rice stripe virus (RSV) viruliferous was
at the 2nd adult. The vector in the field was begun to come from May 29, the maximum densities were 19.6 insects per hill on June 13 in cultivar Chucheongbyeo, 19.3 in Nagdongbyeo, 7.4 in Cheongcheongbyeo and 4.9 in Samgangoyes. The number of vectors per hill was inclined to increase by early transplanting. Although the infection of rice virus in nursery bed was not recognized until May 30 transplanting, the nursery infection could be seen from June 10 transplanting. The highest rate of nursery infection with RSV was
at June 10 transplanting plot, and that of RBSDV was
at June 20 trans planting plot. The infection of rice virus in paddy field was the highest at May 20 transplanting plot, the lowest at July 10 plot. The earlier transplanting, the more severe occurrence of rice viruses. Occurrence of infected plants with RBSDV was shown to increase more rapidly at May 20 and May 30 planting plot than May 10 plots. However, the occurrence of infected plant with RSV was more rapid at May 10 transplanting plot than May 20 and 30.
An Improved Method for Screening Rice Cultivars with Field Resistance to Bacterial Leaf Blight
Choi J. E. ; Lee D. K. ; Seo J. H. ; Bae S. H. ;
Research in Plant Disease, volume 1, issue 2, 1985, Pages 115~115
To improve methods of screening rice cultivars with field resistance to bacterial leaf blight, testing plant inoculation and neighbor plant inoculation were compared by using 33 rice cultivars. In the testing plant inoculation method, field resistance was evaluated by measuring the leaf areas diseased on the new leaves expanded after the inoculation. Varietal differences in field resistance were recognized more clearly by the testing plant inoculation method than by the neighbor plant inoculation method. Highly significant correlation was observed between the results of the two methods. Some rice cultivars such as, Seomjin, Hangangchal, Taebaeg, Samgang, Milyang 42, Asominori, Java 14, Chugoku 45 and 70X-46 showed remarkable field resistance to bacterial leaf blight. The testing plant inoculation method appeared desirable for screening rice cultivars for the qualitative and field resistance to bacterial leaf blight because of using less labor and less field area than neighbor plant inoculation.
Effect of Temperature Treatments on the Penetration and Disease Development in the Leaf Epidermis by the Rice Blast Fungus, Pyricularia oryzae Cavara II. Difference in Percent Penetration, Hyphal Growth and Lesion Formation by Pre and Postdisposing Temperatures
Kim Chang Kyu ; Mogi Shizuo ;
Research in Plant Disease, volume 1, issue 2, 1985, Pages 122~122
Three rice cultivars, Aichi-asahi, Toyotama and Yamabiko, possessing a resistance gene
were evaluated for penetration, hyphal growth in the leaf epidermis and lesion formation using 6 isolates of Pyricularia oryzae by treating pre- and post disposing temperatures of
(day/night) regimes, respectively. Percent penetration of the fungus was higher on the seedlings disposed at
regime and more lesions were formed at 7 days after inoculation than at
regime. Degree of hyphal growth and number of host cells with hyphal growth were remarkably increased from 72 to 96 hr after inoculation at
regime. However, lesion formation on the seedlings disposed at
regime was delayed, possibly as a result of the suppressed hyphal growth until 96 hr after inoculation.
Tolerance of Apple Blue Mold (Penicillium expansum) to Various Fungicides
Lee Chang Un ;
Research in Plant Disease, volume 1, issue 2, 1985, Pages 128~128
Responses to the 14 fungicides added in PSA of penicillium expansum isolated froms the four major apple growing areas in Korea were examined. Degrees of the fungal tolerance were various with little difference by area and with great difference by kind and concentration of fungicide. Fall isolates of the fungus grew at higher fungicide concentration than did the spring isolates.
and MIC to mycelial growth of genomyl, garbenda, polydong, polyoxin and thiophanate methyl were
, respectively, indicating high fungicide effects on the fungus isolated from decayed apples in storages and infected apples in orchards with low fungal tolerance; of captafol, captan, iprodione and mancozeb were
, respectively, indicating medium degree of both fungicidal effects and fungal tolerance; and of chlorothalonil, folpet, oxidong, propineb and triademefon were
, respectively, indicating low fungicide effects and high fungal tolerance. Fungicidal inhibitory effects on conidia formation exhibited a similar trend as on mycelial growth whereas those on conidia germination showed an opposite trend to the mycelial growth with the exception of polyoxin and triademefon.
Resistance of Corn to Maize Dwarf Mosaic Virus: Genetic Analysis by Diallel Cross
Heo N. Y. ; Kim D. U. ; Ryu G. H. ; Kang C. S. ; Lee K. H. ;
Research in Plant Disease, volume 1, issue 2, 1985, Pages 136~136
The studies were conducted to test for combining ability and to evaluate resistance to maize dwarf mosaic virus (MDMV) by diallel crosses of corn inbreds. For the genetic analysis of the resistance, a diallel set of crosses without reciprocals was made using the eight corn inbreds which had different degrees of resistance to MDMV. Twenty eight
hybrids showed different symtom severity. the highest value is 3.63 and the lowest value is 1.87 in disease ratings (1-4). General combining ability (GCA) for resistance to MDMV was highly significant, but specific combining ability (SCA) was not significant. Two inbreds, A632 and KS15 showed negative GCA effects, indicating that these parents were good general combiners and that resistance to MDMV increased in hybrid combinations. Hyrid A632 x KS5, showed the highest negative SCA effect and several combinations showed negative SCA effects. The analysis of parent-offspring covariance (Wr) and array variance (Vr), suggest that there may be many dominant genes in the resistant inbreds and many recessive genes in the susceptible inbreds.