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Figure 2.5 (A) Diagram of clamp formation in hypha of a Basidiomycotina. Each cell of the dikaryon has two nuclei of both types. (B) Nuclear types had clamps not formed. (From Ingold and Hudson, The Biology of Fungi (1993), Chapman and Hall. With permission of Kluwer Academic Publishers.)

air channels within fruit bodies) and SC7 but not SC3 (which coats aerial hyphae and hyphae at the surface of fruit bodies); whereas on a hydrophobic surface the nuclei were separated (13 to 16 ^m) and the hyphae secreted hydrophobin SC3 but not hydrophobins SC4 and SC7. The regulation of gene activity by modulating the internuclear distance could be a unique mechanism in fungal hyphae and could be an important adaptation to changing environmental conditions.

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