{"title":"Effects of Host Variety, Plant Maturity, Soil Temperature, and Soil Moisture on the Severity of Macrophomina Stem Rot of Jute","authors":"Yung-Hsiung Cheng, C. Tu","doi":"10.29951/JARC.197212.0008","DOIUrl":"https://doi.org/10.29951/JARC.197212.0008","url":null,"abstract":"本省目前推廣之黃麻4品種中並無完全抗立枯病品種。臺農3號具中等抗病性，其次爲臺農選1號，再次爲臺農1號，而以臺農2號最爲感病。黃麻自發芽後14日內可因(Macrophomina phaseoli (Maubl)Ashby之侵染產生嚴重幼苗根腐型立枯病，但自30日後黃麻根部對立枯病病原菌之侵染具有抵抗性，即使極感病性品種（臺農2號）亦未見有根腐型病徵。黃麻愈成熟愈容易發生莖腐型立枯病，經以牙籤接種法將病原菌接種在不同生育日數之黃麻莖部，15日後檢查罹病病斑結果，以臺農1號爲例、生長日數30日者爲21.69平方公厘，60日者爲31.38平方公厘，90日者爲32.63平方公厘，120日者爲34.69平方公厘。土壤溫度與黃麻根腐型立枯病之發生成正相關關係。在35℃土溫下黃麻根腐型立枯病發生指數爲19.26，31℃爲12.3，27℃爲9.90，而以23℃最少爲7.58。土壤濕度與黃麻莖枯型立枯病之發生成負相關關係。低土壤濕度環境下較容易感染；病斑擴大快速，而在高土壤濕度環境者較有抵抗性；病斑擴大緩慢。黃麻（臺農1號）生長在不同含水量土壤1個月後接種病原菌，經15日後調查病斑大小結果，45%MHC者平均爲17平方公厘，35%MHC者爲25平方公厘，25%MHC者爲26平方公厘，而以15%MHC者病斑最大爲44平方公厘。","PeriodicalId":159002,"journal":{"name":"Taiwan Agricultural Research","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1972-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116278401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Reaction of rice varieties to winter hardiness.","authors":"W. Chang","doi":"10.29951/JARC.197006.0003","DOIUrl":"https://doi.org/10.29951/JARC.197006.0003","url":null,"abstract":"The reaction of rice varieties to winter hardiness was evaluated in the first crop of 1970 at the Chiayi Agricultural Experiment Station. The winter survival of young rice plants in the dry nursery indicated that japonica varieties were more resistant to winter injury than indica varieties. Varieties developed at or native of Taiwan showed better survival from winter killing than those from tropical regions of the United States, Philippines, and India. Visual estimates of chlorosis on rice seedlings in the ordinary wet nursery showed that varieties of poor winter survival generally developed severe chlorosis. Reaction of heterogenous populations were usually intermediate between those of the parents or components involved.","PeriodicalId":159002,"journal":{"name":"Taiwan Agricultural Research","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1970-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116584458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Serological studies on genotypic relationship among rice varieties.","authors":"S. Hsieh","doi":"10.29951/JARC.197006.0001","DOIUrl":"https://doi.org/10.29951/JARC.197006.0001","url":null,"abstract":"Three rice cultivars, Taichung (n) 1 (indica type) and Taichung 65 and Nakamura (japonica types), were used to immunize rabbits to obtain antisera. Another 37 rice cultivars from various countries were used as antigen sources for studies of antigen-antibody reactions between the two groups of cultivars. When the antisera incited by immunization with seed protein of japonica type cultivars were titred with antigens from known japonica type cultivars, a positive precip itation reaction occured, but no reaction was obtained with antigens from indica type cultivars. In a few cases antigens from a cultivar reacted with both indica and japonica type antisera. The antigens from these intermediate types may have had reating sites for both types of antisera or the antigen complex may have contained two antigen types, one for indica and one for japonica. These intermediate cultivars that appeared to have both indica and japonica antigens may have been selected from japonica x indica crosses. The gel-diffusion technique showed rice cultivars within indica or within japonica could be grouped into subgroups on the basis of the pattern of their precipitated bands. There was no relationship among American rice cultivar for grain length, i.e., long, medium or short japonica and indica type. The serological method would be useful for assigning rice cultivars to japonica or indica types and perhaps to subgroups within these types. Whether it would be useful to rice breeders to pre dictdesirable crosses must await additional study,","PeriodicalId":159002,"journal":{"name":"Taiwan Agricultural Research","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1970-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130953324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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