Biochemical Aspects of Plant–Parasite Relationships. by J. Friend

By J. Friend

Biochemical facets of Plant-Parasite Relationships

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Additional resources for Biochemical Aspects of Plant–Parasite Relationships. Proceedings of The Phytochemical Society Symposium University of Hull, England April, 1975

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B. Molecular Exchange . . . . C. Incompatibility . . . . References . . . . . . I. . . . 43 45 45 54 58 70 . 7 1 72 . 7 3 77 INTRODUCTION A biotrophic fungus may be defined as one which, as a parasite, must derive the nutrients it requires for growth and full development from the living tissues of a compatible host. The most i m p o r t a n t phase in the life history of such an organism occurs during the period immediately following the germination of its spores u p o n the surface of a potential host plant.

If several lines with different alleles for resistance are developed in this way all may be compared with the c o m m o n susceptible parent used for backcrossing (Knott and K u m a r , 1972). (c) The degree of isogeny attained. T h e degree to which lines from either type of p r o g r a m m e are isogenic will depend on the number of repetitions of the cycles of selfing or backcrossing. Two factors which influence the attainment of isogeny are the behaviour of genes which are independent of, or unlinked to, the gene for resistance and the behaviour of genes linked to the gene for resistance.

1969) that it may be through the interaction of wall-degrading enzymes and their substrates that specificity m a y be determined. C. INTRACELLULAR INFECTION STRUCTURES 1. The Primary Vesicle (Figs 1 and 2) This structure enlarges very rapidly following penetration by B. lactucae. During its formation the host's cuticle and wall become distorted as a result of enlargement of the penetration pore (Figs 19 and 20). A t an early STRUCTURAL ASPECTS OF INFECTION 59 stage of development the primary vesicle contains many cytoplasmic vesicles similar in appearance to those observed in the appressorium, and their presence may result from a surge of cytoplasm through the infection peg as the latter penetrates the epidermal cell wall.

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