哥伦比亚Cundinamarca的ubat山谷中导致玉米秸秆腐烂的镰刀菌

Q4 Agricultural and Biological Sciences
Germán Yesid Maldonado Archila, G. Ligarreto-Moreno, Sandra Gómez-Caro
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引用次数: 0

摘要

近年来,哥伦比亚寒冷热带地区的玉米(Zea mays L.)作物在Cundinamarca的ubat山谷受到茎腐病的影响,发病率高达40%。尽管这种疾病很重要,但尚未进行准确的诊断。本研究的目的是确定该玉米产区与秸秆腐病相关的玉米倒伏的致病因子,并描述该疾病的症状。2016年7月,在Simijaca市报告了两个发生茎腐病的地块,种植了区域品种Simijaca和Sogamoso。每月对植物进行随机检查,描述疾病症状并分离病原体。对分离的镰刀菌进行了形态和分子鉴定,并进行了致病性试验。2个玉米品种在植株发育早期就发现病害,主要表现为萎黄、叶片花青病和矮化。播后90d,茎纵段出现冠和节坏死,植株的冠、节和节间呈紫色。最后,倒伏发生在作物的任何物候阶段。镰刀菌在植物发育的各个阶段均有分离。镰刀菌属在谷草镰刀菌属复合体中鉴定为谷草镰刀菌属,在藤黑镰刀菌属复合体中鉴定为亚粘滞镰刀菌属,其生态位均以寒区为生态位。致病性试验证实,F. graminearum和F. subglutinans是Cundinamarca Ubate山谷地区玉米品种Simijaca茎腐病的致病因子。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fusarium species that cause corn stalk rot in the Ubaté valley of Cundinamarca, Colombia
In recent years, corn (Zea mays L.) crops in the Colombian cold tropics located in the Ubaté valley in Cundinamarca have been affected by stalk rot with incidences up to 40%. Despite the importance of this disease, accurate diagnosis has not been conducted. The objectives of the study were to determine the causal agents of corn lodging associated with stalk rot in this corn-producing region and describe the symptoms of the disease. Two plots with stalk rot reported in the municipality of Simijaca in July 2016 were sown with the regional varieties Simijaca and Sogamoso. Plants were randomly inspected on a monthly basis for describing disease symptoms and isolating the pathogen. The Fusarium species isolated were morphologically and molecularly identified and pathogenicity tests were conducted. The disease was detected at early plant developmental stages with the combination of chlorosis, leaf anthocyanosis, and dwarfism as the main symptoms in the two corn varieties evaluated. Crown and node necrosis in longitudinal sections of the stalk and purple colorations in the crown, nodes and internodes of plants were observed 90 d after sowing. Finally, lodging occurred at any phenological stage of the crop. Fusarium spp. were isolated in all stages of plant development. Fusarium species were identified as F. graminearum in the Fusarium graminearum species complex and F. subglutinans in the Fusarium fujikuroi species complex, which have cold-climate production zones as their ecological niche. Pathogenicity tests confirmed F. graminearum and F. subglutinans as the causal agents of stalk rot in the regional corn variety Simijaca in the Ubate valley in Cundinamarca.
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来源期刊
Agronomia Colombiana
Agronomia Colombiana Agricultural and Biological Sciences-Agronomy and Crop Science
CiteScore
1.00
自引率
0.00%
发文量
9
审稿时长
25 weeks
期刊介绍: Agronomia Colombiana journal it is intended to transfer research results in different areas of tropical agronomy. Original unpublished papers are therefore accepted in the following areas: physiology, crop nutrition and fertilization, genetics and plant breeding, entomology, phytopathology, integrated crop protection, agro ecology, weed science, environmental management, geomatics, biometry, soils, water and irrigation, agroclimatology and climate change, post-harvest and agricultural industrialization, food technology, rural and agricultural entrepreneurial development, agrarian economy, and agricultural marketing (Published: Quarterly).
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