Atr1 and Chk1 Are Required for Normal in Planta Proliferation of Hyphae.
(A) Images of plant tissues 2 d after infection with the indicated crosses of fungal cells. Hyphae (stained by WGA-AF488; green) grow intracellularly in epidermal cells of maize (stained by PI; red). Arrows mark clamp-like connections. Bar = 10 μm.
(B) Examples of aberrant hyphal morphologies found in chk1Δ and atr1Δ filaments in planta. Asterisk marks the hyphal tip. Arrows denoted aberrant clamp-like structures.