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CORN STUNT DISEASES: LEAVES SYMPTOMS EXPRESSION, MOLLICUTES DETECTION AND INTERACTIONS WITH GENOTYPES

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Author(s): ELIZABETH DE OLIVEIRA | CHARLES MARTINS DE OLIVEIRA | ISABEL R. P. DE SOUZA | PAULO CÉSAR MAGALHÃES | IVAN CRUZ

Journal: Revista Brasileira de Milho e Sorgo
ISSN 1676-689X

Volume: 1;
Issue: 1;
Start page: 53;
Date: 2002;
Original page

Keywords: phytoplasma | spiroplasma | multiplication

ABSTRACT
The objective of this work was to evaluate the multiplication, leaves symptomsexpression and the effects of mollicutes in maize. In order to accomplish this goal, phytoplasmaand Spiroplasma kunkelli were inoculated isolatedly or simultaneously in five maize cultivars,grown under pot conditions. Healthy plants from all genotypes were used in this experiment asa control. Two plants were grown per pot being one of them used to mollicutes detection, byusing the last leaf completely developed at 30, 60 and 100 days after inoculation. The otherplant was used to mollicute’s detection at 100 days after inoculation by using the leaves locatedat the botton, median and apical parts of the plants. Reduction percentage caused by mollicutesin height and plant grain production was evaluated in both plants in relation to the healthy ones.The expression of leaf symptoms and the positive results obtained by mollicutes detection weremore evident 100 days after inoculation. The grain filling stage was considered to be moreadequate for these pathogens detection. Among the three-leaf positions the detection was observed more frequently at the apical leaf position. The results showed predominance ofspiroplasma infection and greater detrimental effect of this pathogen in the plant growth andproduction when compared to phytoplasma infection. It was not detected significant synergisticeffect of both mollicutes on the plant growth and production. The pathogen effect on growthand cultivar production was determined by the frequency of infected plants.
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