IDENTIFICATION AND ISOLATION OF PROTEINS FOUND ONLY IN PLANTS WITH CITRUS DECLINE

Measurement of Zn accumulation in the trunk wood and the water syringe absorption test are the standard tests for diagnosis commonly used to distinguish the trees affected by ''citrus decline'' from other anoma lies that also cause degeneration of citrus plants. However, these tes ts only give positive results in advanced stages of the disease. The o bjective of this work was to identify proteins present only in plants with ''citrus decline''. The plants used were 'Valencia' orange trees with the 'Rangpur lime' as rootstock with and without visual symptoms. Two proteins were characterized and isolated (26 and 23 KD) through e lectrophoresis, which were found only in plants with ''citrus decline' '. For the first time in Brazil these proteins were linked to ''citrus decline''.