Abstract:
The fungus Taphrina deformans is the agent of peach leaf curl, a
worldwide disease of peach potentially devastating to both crop yields and
trees longevity. Generally, the pathogen agents produced structural,
morphoanatomical, physiological and biochemical modifications in host
plant. In this paper we present the influence of the attack of the fungus
Taphrina deformans on the activity of Krebs cycle dehydrogenases: glucose6-phosphate dehydrogenase, α-cetoglutarate dehydrogenase, isocitrate
dehydrogenase, malate dehydrogenase, in Redhaven and Redskin sorts of
peach from experimental field, Miroslava Station Pomiculture. The
determinations was effectued from healthy and infected leaves, beeing to put
in evidence the differentiation in connection with the presence or the absence
of the attack. The activity of glucoso-6-phosphate dehydrogenase at
Redhaven sort had the highest value in healthy leaves, excepting the activity
registered in de 2. 06. 2007, when the enzyme had higher values in infected
leaves. At Redskin sort the activity of glucoso-6-phosphate dehydrogenase
was higher in infected leaves, excepting 14. 05. 2007 and 23. 06. 2007, when
the activity was more intense in healthy leaves. The activity of isocitrate
dehydrogenase at Redhaven sort had higher values in healthy leaves at 14.
05. 2007, 23. 05. 2007 and 2. 06. 2007, and at 11. 06. 2007, 19. 06. 2007 and
23. 06. 2007 the activity of this enzyme was increasing in infected leaves. At
Redskin sort, in healthy leaves, the activity of isocitrate dehydrogenase had
higher values at: 14. 05. 2007, 23. 05. 2007, 2. 06. 2007 and smaller values
at: 11. 06. 2007, 19. 06. 2007, 23. 06. 2007, comparative with in infected
leaves. The activity of α-cetoglutarate dehydrogenase at Redhaven sort was
higher in infected leaves at 23. 05. 2007, 2. 06. 2007 and 11. 06. 2007, and in
the healthy leaves at 14. 05. 2007, 19. 06. 2007, 23. 06. 2007. At Redskin
sort, the activity of this enzyme had higher values in infected leaves excepting
14. 05. 2007 and 19.06.2007, when the values was higher in healthy
leaves.The activity of malate dehydrogenase at Redhaven sort was higher in
the infected leaves, excepting 14. 05. 2007, when the activity was highest in
healthy leaves; at Redskin sort it was observed that the malate
Lucrări Ştiinţifice – vol. 51, seria Agronomie
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dehydrogenase had a more intense activity in the infected leaves, excepting
14. 05. 2007 and 25. 05. 2007, when the activity was higher in healthy leaves.
