Aggressiveness of Xanthomonas axonopodis pv. glycines isolates to soybean and hypersensitivity responses by other plants     

S. Kaewnum  S. Prathuangwong  T. J. Burr † 《Plant pathology》2005,54(3):409-415

Xanthomonas axonopodis pv. glycines ( Xag ) causes bacterial pustule disease which can significantly reduce the production of soybean. A collection of 26 isolates of Xag from different soybean-production areas of Thailand was shown to differ with regard to aggressiveness on soybean. They also differed in their ability to induce a hypersensitive response (HR) on four cultivars of tobacco and on other plant species including pepper, tomato, cucumber, pea and sesame. Tomato was most sensitive to HR induction by Xag . Isolate KU-P-34017 caused an HR on all the plant species tested. The minimal concentration of KU-P-34017 needed to induce HR on tobacco was approximately 5 × 10⁸ CFU mL⁻¹. A bacterium–plant interaction period of at least 2·5 h was necessary for HR, and different temperatures, relative humidity and light periods did not affect HR development. Inhibitors of eukaryotic metabolism, including cobalt chloride, lanthanum chloride and sodium orthovanadate (completely), and cycloheximide (partially) blocked the HR on tobacco, indicating the association of an active plant response. In contrast, the HR on tomato was inhibited only by cobalt chloride.  相似文献   

Susceptibility of Commercial Tomato Cultivars to Bacterial Wilt in Hydroponic System     

Teruo NONOMURA  Yoshinori MATSUDA  Motoaki TSUDA  Kazuto URANAKA  Hideyoshi TOYODA 《Journal of General Plant Pathology》2001,67(3):224-227

Commercially available tomato cultivars were hydroponically cultured for inoculation, with Ralstonia solanacearum (K-101), which causes bacterial wilt, by pouring an inoculum suspension into the nutrient solution. Cultivar susceptibility to the bacteria was evaluated, based on the highest percentage of wilting. Because the length of time for wilt appearance varied among cultivars, some cultivars appeared to be suppressive to the translocation and/or multiplication of the invading pathogen. Thus, this hydroponic inoculation system is effective for examining levels of susceptibility in tomato cultivars to bacterial wilt. Received 13 December 2000/ Accepted in revised form 27 March 2001  相似文献   

Growth Complementation of hrpXo Mutants of Xanthomonas oryzae pv. oryzae by Virulent Strains in Rice Cultivars Resistant and Susceptible to the Parental Strain     

Seiji TSUGE  Ayako FURUTANI  Rie FUKUNAKA  Yasuyuki KUBO  Osamu HORINO 《Journal of General Plant Pathology》2001,67(1):51-57

Xanthomonas oryzae pv. oryzae (X. o. pv. oryzae) T7174 is virulent on rice cultivar IR24 and avirulent on IR-BB2. From recent reports, some virulence and avirulence factors of plant pathogenic bacteria are transferred to plant cells through the hrp-dependent type III secretion system. In this study, we investigated the involvement of hrp genes in the compatible and the incompatible interactions between rice and X. o. pv. oryzae after co-inoculation with hrpXo mutants derived from T7174 and virulent strains. Growth of the mutants, named 74ΔHrpXo and 76ΔHrpXo, was repressed in IR24 when the mutants were applied alone. However, growth of the mutants was complemented by co-inoculation with virulent strains. Growth of bioluminescent hrpXo mutant 76ΔHrpXo in IR24 and its growth in IR-BB2 after co-inoculation with T7133, which is virulent on both cultivars, was equally complemented, as detected by bioluminescence from the mutant. On the other hand, only partial complementation of growth of T7174L76, which is a bioluminescent and pathogenic derivative of T7174, by T7133 was observed in IR-BB2. Thus, growth of the hrpXo mutant of X. o. pv. oryzae was complemented by virulent strains in both susceptible and resistant rice leaves with the parental strain. Received 21 July 2000/ Accepted in revised form 26 October 2000  相似文献   

苔藓植物生态学研究的数量分析方法   总被引：5，自引：0，他引：5  

张元明  郭水良  曹同  潘伯荣 《干旱区研究》2001,18(1):69-72,75

植被数量分析方法在苔藓植被中的应用起步较晚，仅有20多年的研究历史，但发展却十分迅速。这里介绍了目前苔藓植物生态学研究中应用较为普遍的数量分析方法，并探讨了各自的优缺点。  相似文献   

新疆哈纳斯自然保护区地衣群落的聚类分析   总被引：3，自引：0，他引：3  

阿不都拉阿巴斯  艾尼瓦尔·吐米尔  帕提古丽·马合木提  努尔巴衣·阿不都沙勒克 《干旱区研究》2001,18(3):25-28

我们根据多年的实地调查结果并采用聚类分析方法对分布在哈纳斯国家级自然保护区的地衣群落进行了研究。结果表明分布在该地区的地衣种类有 10 3种 ,他们分别属于 2 0科 ,4 0属。地衣物种形成了 6种群落。同时发现该地区地衣对基物形成专一性 ,它们的基物包括 :树皮、藓丛、藓土、草地、石面、地面、土层、石浮土等。  相似文献   

勒克瑙根结线虫居群对我国亚热带丝瓜的危害     

唐本安  唐敏  石亮明 《植物保护》2001,27(5):7-9

通过田间对感根结虫病的丝瓜植株取样调查发现 ,勒克瑙根结线虫居群对中国亚热带地区丝瓜生产危害较大 ,受害面积占调查面积的30% ,减产25%以上。研究发现勒克瑙根结线虫居群危害丝瓜的原因是丝瓜属于勒克瑙根结线虫的寄生植物 ;防治勒克瑙根结线虫居群危害最有效、最经济的方法是利用勒克瑙根结线虫属专性植物寄生线虫的生物学特性 ,实行蔬菜品种轮作。  相似文献   

6个日本脐橙优良品种对柑桔溃疡病的抗性调查   总被引：2，自引：0，他引：2  

韦建福  韦禄贵  覃光明  罗国飞 《植物保护》1995,21(5):18-19

在广西象州柑桔溃疡病疫区引种试栽了6个日本脐橙品种，丹下，铃木，森田，清家，白柳，吉田。经３年调查观察，发现品种间抗病性和丰产性有不同程度的差异，其中以丹下表现最好，可在疫区适当发展这一优质脐橙品种。  相似文献   

用免疫分离法检测稻种上的白叶枯病菌   总被引：2，自引：0，他引：2  

许志刚  刘凤权 《植物病理学报》1995,25(1):5-8

 免疫分离法是一种新型的、高度灵敏和准确的种菌带菌检验法,它结合了利用专化性抗血清的选择法吸附作用和活细菌可形成菌落的两方面的优点,从种苗材料中分离到目标细菌,用纯菌测试它的回收率为50~70%,最低检出率为50~100个菌/ml,人工喷接种和病田收获的病种带菌率达87%,平均每粒自然病种上的细菌数在100个左右。免疫分离所得菌落经致病性测定,大多数为白叶枯菌。  相似文献   

水稻细菌性条斑病发生及流行因子分析     

童贤明  徐鸿润  朱灿星 《植物保护学报》1995,22(2):97-101

人工接种及病区调查研究结果表明，在种植感病品种情况下，气温决定了水稻细菌性条斑病的发生与否和潜育期的和短衣病斑长度；病害发生的最低温为１２℃，发病最适温度为２５－３０℃以上，而湿度决定此病发病率及严重度。结合主成分分析，该病在田间的流行取决于温度／湿度及降雨量。台风暴雨造成的伤口有利于病害的流行。  相似文献   

Community Forestry and Sustainable Development in Rural Area     

XU GuozhenCollege of Resources  Environment Central South Forestry University. Zhuzhau . P.R. China 《中国林业科技(英文版)》2003,(4)

After analysis on the current situation of international forestry, this paper proposes that integration, coordination and sustainable development will be the general developing trend of forest in China, and commercial forest, ecological forest and community forest should be organically combined with integrative development and sustainable development in rural areas. This paper focuses especially on clarifying the importance of community forest to the social development or rural areas, and emphasizes that the key point of forestry should be turned from biological and technical aspects to humane and social aspects.  相似文献