茭白黑粉菌在茭白植株内形态发育的初步研究

A PRELIMINARY STUDY ON THE MORPHOGENETIC DEVELOPMENT OF USTILAGO ESCULENTA IN PLANT OF ZIZANIA CADUCIFLORA

茭白黑粉菌的菌丝体多年生,越冬期宿存于茭白地下茎中,翌年春天入侵由地下茎芽体形成的植株。菌丝具隔膜,分枝,细胞双核,在寄主细胞间隙并入侵细胞中生长,无吸器;受菌丝侵染的茭白地上茎薄壁细胞分裂增多,体积加大,并高度液泡化,使茎膨大。部分菌丝在茭白茎膨大后期菌丝壁胶化,原生质收缩成团,生成厚壁,形成冬孢子。

Mycelium of Ustilago csculenta P. Hcnn. is perennial which passes the cold winter seasons in rhizome of Zizania caduciflora Handl-Mazz. and invades the shoots developing from buds of the rhizome the next spring. Mycelium is scptated, binuclcate and profusely branched. Invasion of hyphae is intercellular and intracellular. No apprcssoria or haustoria are to be found. Cells of the parenchymatous tissue of infected portion of host plant divide rapidly with newly formed cells in great enlargement and high vacuolization which causes the shoot swelling. Part of hyphal cells with their wall transforms into mucous substance at the late stage of shoot swelling. Protoplasm of such mucoid hyphal cells contract into round cells, secreting thick wall and change into tcliospores (chlamydospores).