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首页> 外文期刊>Pakistan journal of botany >Screening of maize genotypes under northern corn leaf blight (NCLB) epiphtotic at Rawlakot Azad Kashmir
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Screening of maize genotypes under northern corn leaf blight (NCLB) epiphtotic at Rawlakot Azad Kashmir

机译：北玉米叶片枯萎病（NCLB）骨骺筛选玉米叶片（NCLB）的筛选

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Northern corn leaf blight (NCLB) is most devastating maize foliar disease in Himalayan region of the world, caused by fungus Exerohillum turcicum . The present investigations were carried out to screen the 30 maize genotypes against NCLB under agro-climatic field conditions of Rawalakot, Azad Kashmir-Pakistan. Artificial inoculation was done at four to six leaf stages during spring 2017. The disease severity of maize genotypes was assessed using 0-5 points scale. Data were recorded on number of lesions on leaf, lesion length, number of infected leaf, number of infected plants, percentage leaf infection, percentage plant infection, disease severity, disease index, disease incidence and area under disease progressive curve (AUDPC). Genotypes had significant differences for NCLB severity and reactions and were classified into resistant, highly resistant, moderately resistant, susceptible and highly susceptible categories. The percent disease incidence ranged from 20-60%, disease index (20-66%), disease intensity (16-34%) and area under disease progressive curve was 22-362%-dsu (percentage development stage unit). Based on disease rating scale and pathological traits, it was reported that three genotypes i.e., Karamat-Bar-25, SZP-13200 and NCEV-1530-11 had lowest values for all pathological traits and severity rating of 5R, 5R and 10R respectively and marked as highly resistant (R) genotypes, whereas three genotypes viz., Soan-3, Ghuari-122 and Kissan-60 were evaluated as highly susceptible (S) within germplasm and had highest values for all pathological traits and severity rating of 90S, 90S and 80S respectively. Fourteen genotypes were moderately resistant (MR), 10 were moderately susceptible (MS) under field conditions. Results suggested that the genotypes found resistant to leaf blight might be utilized in future breeding program. Alternatively, the said promising genotypes might also be used as parents in hybridization in order to transfer the gene for resistance to early blight to existing adapted high yielding cultivars.
机译：北玉米叶枯萎病（NCLB）是世界喜马拉雅地区的最毁灭性的玉米叶面疾病，由真菌Exerohillum Turcicum引起。本研究旨在筛选30玉米基因型对NCLB的NCLB，Azad Kashmir-Pakistan rainahakot的农业气候条件下。在2017年春季，在四到六个叶阶段进行人工接种。使用0-5分尺寸评估玉米基因型的疾病严重程度。数据记录在叶片，病变长度，感染叶数，感染植物数量，百叶菌百分比，植物感染，疾病进展曲线（AUDPC）下的植物感染，疾病发病率和面积的百分比百叶菌数。基因型对NCLB严重程度和反应具有显着差异，并被分为耐药性，高度耐高压，耐敏感，易感和高易感类别。疾病发病率的百分比范围为20-60％，疾病指数（20-66％），疾病强度（16-34％）和疾病的面积逐渐曲线为22-362％-DSU（百分比开发阶段单位）。基于疾病评级规模和病理性状，据报道，三种基因型，即Karamat-Bar-25，SZP-13200和NCEV-1530-11分别具有5R，5R和10R的所有病理性状和严重程度等值的最低值标记为高度抗性（R）基因型，而三种基因型Qiz，Soa-3，Ghuari-122和Kissan-60被评估为种质中的高度敏感性，并且所有病理性状的最高值和90岁的严重程度为90s， 90s和80s。十四个基因型是适度抗性（MR），10在现场条件下适度易感（MS）。结果表明，未来的育种计划可能会利用发现抗叶枯萎病的基因型。或者，上述有前途的基因型也可以用作杂交中的父母，以便将基因转移到抗性对现有的高产品种的抗性。

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