Phenolic compounds of apple cultivars resistant or susceptible to Venturia inaequalis.
BACKGROUND
Phenolic compounds play an important role in the plant defense mechanism and are responsible for antioxidant capacity in fruits and vegetables. It is known that the phenolics can determine in the leaves of plants which are resistant/susceptible to fungal infections.


OBJECTIVE
This study investigated the total phenolic compounds, content of shikimic acid from 33 different apple cultivars leaves infected with Venturia inaequalis [(Cke). Wint.] cultured in Fruit Research Station, in Egirdir, Isparta, Turkey.


METHODS
Leaves of apple cultivars were collected three times in an interval of 30 d from July to September in 2010, and analyzed using HPLC methods to detect changes in the amount of the phenolic compounds and shikimic acid.


RESULTS
Total phenolic compounds and shikimic acid in resistant/moderate susceptible apple cultivars were higher than susceptible apple cultuvars, although not statistically different between resistant and susceptible apples. The content of shikimic acid was statistically higher only in the leaves of the domestic cultivar Ankara güzeli on all three dates.


CONCLUSIONS
Recently, there have been increased studies trying to explain the resistance mechanism in plants. Natural resistance genes are investigated in some apple cultivars and new resistance varieties which have resistant genes are identified daily. Our study hold to determine the relationship between the phenolic compounds and the expression of resistance seems to be promising.
Department of Plant Protection, Faculty of Agriculture, Suleyman Demirel University , Isparta , Turkey .
Serife Evrim
SE
Arici
Ebru
E
Kafkas
Suat
S
Kaymak
Namik Kemal
NK
Koc
D001203:Ascomycota / Q000502:physiology*; D002851:Chromatography, High Pressure Liquid; D060467:Disease Resistance; D027845:Malus / Q000737:chemistry* / Q000382:microbiology*; D010636:Phenols / Q000032:analysis*; D010935:Plant Diseases / Q000382:microbiology; D018515:Plant Leaves / Q000737:chemistry / Q000382:microbiology; D012765:Shikimic Acid / Q000032:analysis
D010636:Phenols; D012765:Shikimic Acid
Apple scab; HPLC; Malus domestica; resistance; shikimic acid