Histopathological assessment of the infection of maize leaves by Fusarium graminearum, F. proliferatum, and F. verticillioides

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• 作者：Thi Thanh Xuan Nguyen^a ; ^b ; ^{thanhxuan.agu@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Heinz-Wilhelm Dehne^a ; Ulrike Steiner^a
• 关键词：Fusarium spp. ; Foliage infection ; Penetration ; Sporulation ; Stomata ; Symptom
• 刊名：Fungal Biology
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：120
• 期：9
• 页码：1094-1104
• 全文大小：3544 K

文摘

Young maize plants were inoculated on unfolded mature leaves and on folded immature leaves with Fusarium graminearum, Fusarium proliferatum, and Fusarium verticillioides suspensions. Infection and symptom development of disease on these asymptomatic mature leaves and immature leaves were then documented. Subcuticular infection was found by the three Fusarium species on both symptomatic and symptomless leaves. The three Fusarium species penetrated the stomata of immature leaves by the formation of appressoria-like structures, infection cushions or by direct penetration. Infection by the three species of Fusarium via stomata is reported here for the first time. The superficial hyphae and re-emerging hyphae of the three species produced conidia. The macroconidia of F. graminearum produced secondary macroconidia and F. proliferatum formed microconidia inside the leaf tissues that sporulated through stomata and trichomes. The infection of maize leaves by the three species of Fusarium and their sporulation may contribute inoculum to cob and kernel infection.