Figure 5.

In situ growth inhibition and stimulation of pigment production of R. solani in the presence of L. erythrorhizon hairy roots. A, Hairy roots grown in the light on M medium (left) and grown in the dark on M medium (right). The fungal plug is seen on the left in each plate. B, Pigment formation in root cells at the points of contact with hyphae. C, Accumulation of shikonin at lateral root eruptions on roots grown in M-9 medium showing inhibition of fungal growth. D, Root tip with greatly increased pigment production is free of hyphae, whereas the surrounding root surfaces are completely overcome.