| Pak. J. Bot., 39(1): 183-191, 2007. | Back to Contents | ||||
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Updated: 09-07-09 | ||||
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THE APPEARANCE OF SYSTEMIC ACQUIRED RESISTANCE COMPONENTS IN SA-TREATED
OR NATURALLY INFECTED VITIS PLANTS BY UNCINULA NECATOR Abstract: In the present study salicylic acid (SA) treatment and challenge by
Uncinula necator (Schwein.) Burr., significantly induced the
systemic acquired resistance components in grapevine (Vitis vinifera
L. cv. Sultana). Chitinase (CHV, EC 3.2.1.14) and ß1,3-glucanase
(Laminarinase, EC 3.2.1.39) activities increased in SA-treated (100,
200 and 400 ppm) as well as in U. necator infected plants and
the highest enzymatic activity was observed in leaves treated with 100
ppm of SA. In contrast, total protein content and accumulation of endogenous
free-SA in the leaves were observed at the highest rate of 200 ppm of
SA-treatment. Salicylic acid also affected photosynthetic pigments by
causing decrease in chlorophyll a and b contents and increase in carotenoids
content. Treatment of grapevine leaves with SA provides an attractive
tool for the control of powdery mildew disease in grapevine.
Department of Biology, Faculty of Science, Ege University, 35100 Bornova,
Izmir, Turkey. |
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