Submitted to: European Plant Protection Organization Bulletin
Publication Type: Abstract Only
Publication Acceptance Date: 10/11/1999
Publication Date: 2/1/2000
Citation: ABAD-CAMPOS, P., PEREZ, A., MARQUES, M., VICENTE, M., BRUTON, B.D., GARCIA-JIMENEZ, J. ASSESSMENT OF VEGETATIVE COMPATIBILITY OF ACREMONIUM CUCURBITACEARUM AND PLECTOSPORIUM TABACINUM ISOLATES FROM MELON DISEASED PLANTS. EUROPEAN PLANT PROTECTION ORGANIZATION BULLETIN. 2000. P. 16.
Technical Abstract: One of the most important diseases of muskmelon in Spain has been referred to as collapse, sudden wilt, or vine decline. Different soilborne plant- pathogens cause syndromes very similar in their symptomathology, which is characterized by a sudden collapse of the plant when fruits are ripening. Acremonium cucurbitaceaum and Plectosporium tabacinum are two of the fungi implicated in this disease. Genetic diversity among populations of these two plant-pathogens has been approached by the assessment of vegetative compatibility using nitrate non-utilizing auxotrophs. In A. cucurbitacearum, with a host range limited to Cucurbitaceae and found in Spain, California and Texas, ten vegetative compatibility groups (VCGs) have been identified. P. tabacinum, anamorph of Plectosphaerella cucumerina, has worldwide distribution and wide plant host range. From a collection of P. tabacinum isolates with different plant and geographical origins, only four pairs have developed complementary heterokaryons when pairings of phenotypically distinct nit mutants (nitl x NitM) were conducted. Each of the four VCGs consist of two members with close geographical origin and all the isolates were from diseased melon plants. From the remaining P. tabacinum isolates, two did not produce nit mutants, two were self-incompatible and the others vegetatively incompatible between them, suggesting that this fungal species may have wide genetic diversity in nature.