지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
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In an experiment to evaluate the various aspects of symptom of witches' broom of jujube tree with two different kinds of scions, taken from diseased plant and stem-grafted upon sound stocks-one cut before wintering(stored in cellar), the other after wintering, it was observed that the disease rate of those cut before wintering(Nov.) was 98% whereas those cut after wintering(March) showed much lower rate, 3% initially and gradually increased up to 39%.
In another experiment of diseased bud grafted into healthy seedling, the finding made in the following year was that 14 stocks(only one of which saw union by callusing) were infected out of the given 23─ in the initial stage only 4, yet gradually increased to the number of 14. The shoots from the ground portion of the diseased stock were in general more quickly subjected to the disease than the others.
Under natural condition, the diseased trees develop at first seemingly the same leaves as healthy ones; it is not until the branches and leaves grow to a considerable degree that the symptom appears. Once appearing, the disease grows and the symptom continues to appear as late as in Sept. and early Oct., causing the plant to develop the extraordinary branches and leaves of extremely reduced size, the typical symptom of witches' broom. Such phenomenon can be observed in the experiments of the foregoing paragraphs. And the suckers and roots of diseased plant are bound to be infected, it was found out with no exception.
Viewing from the results of the above experiments and observation, it is believed that the low temperature during winter causes the virus in the above-ground portion of diseased plant to diminish or inactivated, and subsequently the virus in the roots moves up or multiply in the sprouting season.
In another experiment of diseased bud grafted into healthy seedling, the finding made in the following year was that 14 stocks(only one of which saw union by callusing) were infected out of the given 23─ in the initial stage only 4, yet gradually increased to the number of 14. The shoots from the ground portion of the diseased stock were in general more quickly subjected to the disease than the others.
Under natural condition, the diseased trees develop at first seemingly the same leaves as healthy ones; it is not until the branches and leaves grow to a considerable degree that the symptom appears. Once appearing, the disease grows and the symptom continues to appear as late as in Sept. and early Oct., causing the plant to develop the extraordinary branches and leaves of extremely reduced size, the typical symptom of witches' broom. Such phenomenon can be observed in the experiments of the foregoing paragraphs. And the suckers and roots of diseased plant are bound to be infected, it was found out with no exception.
Viewing from the results of the above experiments and observation, it is believed that the low temperature during winter causes the virus in the above-ground portion of diseased plant to diminish or inactivated, and subsequently the virus in the roots moves up or multiply in the sprouting season.
목차
SUMMARY
Ⅰ. 緖論
Ⅱ. 接木에 依한 病徵發現
Ⅲ. 野外에서의 疾病發現狀況
Ⅳ. 考察 및 結論
Ⅴ. 引用文獻
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UCI(KEPA) : I410-ECN-0101-2009-481-017557351