Relation between rishitin accumulation and degree of resistance of potato tuber tissue to infection by an incompatible race of phytophthora infestans

Sato, N.; Tomiyama, K.

Annals of the Phytopathological Society of Japan 42(4): 431-435


Accession: 006294031

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The cut surface of potato tubers was inoculated with an incompatible race of P. infestans, and the relations between the degree of resistance and time course of rishitin accumulation were studied. In highly resistant tissues, rishitin became detectable earlier after inoculation than in tissues with medium and low levels of resistance; the increase in rishitin content was rapid and reached maximum early as disease development stopped. Thus the maximum rishitin content was lower in the highly resistant tissue than in one with medium resistance. With medium resistance, rishitin was detected later, but the increase was rapid and reached a higher amount than did the highly resistant tissue. In tissues with low resistance, the time of onset of rishitin accumulation was late, and the increase in rishitin content was slow. Rishitin apparently plays an important role in the resistance of potato to late blight.