THE HOST-PARASITE RELATIONSHIP BETWEEN ZIZANIA CADUCIFLORA TURCZ. AND USTILAGO ESCULENTA P. HENN. I. STRUCTURE AND DEVELOPMENT OF THE HOST AND HOST–PARASITE COMBINATION

Authors


  • *

    Present address: Department of Biology, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong.

SUMMARY

Infection of the flowering culm of Zizania caduciflora by the smut fungus, Ustilago esculenta, results in a swollen structure named‘gau sun’This host-parasite combination is culivated as a vegetable in eastern Asia. The structure and development of gau sun is described and terms are denned to describe developmental stages. The swollen culm (gau sun) has a volume 517 × that of the unswollen culm and contains 2-9 × the number of cells which are 14-9 × the volume of those in the unswollen culm. Mucilaginous cavities, absent from the unswollen culm, make up 16% of the total volume of the swollen culm.

Ancillary