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2016年广西柳州和来宾蔗区甘蔗梢腐病发生情况及品种抗性分析
作者: 罗 霆1  段维兴1  黄有总2  唐仕云1  王泽平1  李毅杰1  刘平武2  林善海1 *  
单位: (1 广西农业科学院 甘蔗研究所/中国农业科学院 甘蔗研究中心/农业部广西甘蔗生物技术与遗传改良重点实验室  南宁 530007;2 广西大学 农学院  南宁 530004)  
关键词: 甘蔗  梢腐病  区域性  聚类分析  抗性评价  
分类号:435.661
出版年,卷(期):页码:2017 ,48 ( 2 ): 页码:292-296
摘要:

【目的】明确广西柳州和来宾蔗区甘蔗梢腐病的发生情况及品种抗性,为甘蔗品种的合理布局及梢腐病的综合防控提供科学依据。【方法】采用定点和随机的方法,在甘蔗梢腐病发生初期对广西柳州和来宾市6个县级蔗区甘蔗主栽品种梢腐病的发生情况进行调查。根据发病程度,利用病情指数划分的抗性标准和聚类分析的方法对品种的田间抗性进行综合评价,并分析梢腐病的区域性发生情况。【结果】2016年广西柳州和来宾蔗区甘蔗梢腐病发病率为0~6.11%,其中新植蔗发病率为0.34%~1.87%,宿根蔗发病率为0~6.11%;除柳城05-136外,宿根蔗感病程度均比新植蔗严重。粤糖93-159在来宾市兴宾区发生最严重,其次为粤糖00-236在来宾市武宣县。综合各品种新植和宿根蔗在不同蔗区的抗性表现,柳城03-1137、ROC16和桂糖40表现为高抗,其余6个品种表现为抗性。从小蔗区来看,调查的6个不同县(区)甘蔗梢腐病发病率差异较明显,其中武宣蔗区的发病率最高(2.85%),融安蔗区发病率最低(1.52%)。从大蔗区来看,调查的两个大蔗区(柳州和来宾)甘蔗梢腐病发生程度差异不明显(P>0.05),柳州蔗区发病率稍低(1.93%),来宾蔗区发病率稍高(2.39%)。【结论】目前甘蔗梢腐病在广西柳州和来宾蔗区发生程度较轻,柳州和来宾两个大蔗区甘蔗梢腐病发生程度差异不明显,但小蔗区差异较明显。甘蔗品种对梢腐病的抗性具有一定的遗传稳定性,但区域性气候及生态环境条件等是影响梢腐病发生、发展的重要决定因素。

【Objective】The present study investigated occurrence of sugarcane pokkah boeng in Liuzhou and Laibin of Guangxi and varieties resistance, in order to provide scientific reference for sugarcane variety distribution and disease control. 【Method】A survey was conducted in six counties of Liuzhou and Laibin with methods of fixed-point and random selection. Pokkah boeng occurrence at initial stage was investgated. According to disease degree, pokkah boeng resistance of sugarcane varieties in field was comprehensively evaluated combing disease resistance standard and clustering analysis.Regional difference of sugarcane pokkah boeng occurrence was analyzed as well. 【Result】Incidence of sugarcane pokkah boeng in Liuzhou and Laibin was 0-6.11%. incidence of new-planting was 0.34%-1.87% and that of ratoon was 0-6.11%. Ratoons were more susceptible than new-plantings except for variety Liucheng 05-136. Disease incidence was the highest on variety Yuetang 93-159 in Xingbin district of Laibin city, and followed by variety Yuetang 00-236 in Wuxuan county of Laibin city. Based on the resistance performance of ratoon and new-planting in different areas, three varieties Liucheng 03-1137, ROC16 and GT40 were identified as high resistance, and the rest six varieties were identified as resistance. In terms of county sugarcane planting areas, there was obvious difference in disease incidence in the six investigated counties(districts). The incidence in Wuxuan county was the highest(2.85%) and that in Rong’an county was the lowest(1.52%). In terms of city sugarcane planting areas, there was no obvious difference in pokkah boeng incidence in the two areas (Liuzhou and Laibin)(P>0.05). The incidence in Liuzhou(1.93%) was lower than that in Laibin(2.39%). 【Conclusion】At present, pokkah boeng is not a serious threat to sugarcane planting in Liuzhou and Laibin. There is no obvious difference in disease incidence regarding Liuzhou and Laibin, but there is obvious difference regarding county sugarcane planting areas. Sugarcane variety has a certain genetic stability concerning pokkah boeng disease resistance, but regional climate and ecological environment conditions are key factors affecting the occurrence and development of sugarcane pokkah boeng.

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