first report of sclerotinia head rot of cabbage in iran

نویسندگان

وحیده یوسف دوست

نویسنده یوبرت قوستا

نویسنده

چکیده

cabbage (brassica oleracea var. capitata) is an economically important and widely cultivated vegetable in urmia region, west azerbaijan, iran. during the surveys of cabbage diseases in the years 2009-2012, mature plants of both white cabbage (b. o. var. capitata f. alba) and red cabbage (b. o. var. capitata f. rubra) with yellowing and detaching of lower leaves, watersoaking, browning and softening of leaf petioles and head outer parts, formation of white cottony mycelium and numerous large and black sclerotia on diseased parts, characteristics of sclerotinia head rot of cabbage, was observed (fig. 1 in persian section). infected heads or petiols and sclerotia were collected, surface sterilized and grown on pda medium. isolated fungi were purified by hyphal tip culture method and were kept in pca slants for further studies. apothecia were produced from sclerotia based on the method of mylchreest and wheeler (1987). based on morphological characters of isolated fungi, sclerotinia sclerotiorum (lib.) de bary was identified (purdy, 1979; saharan and mehta, 2008). pathogenicity tests were performed both on detached leaves and on container-grown healthy, 3 months old cabbage stems. healthy cabbage leaves were washed under tap water, and then surface sterilized with 10% ethanol and inoculated at the center with a 5 mm2 pda plug from 5 days old mycelial cultures. the inoculated leaves were kept in plastic containers equipped with wet filter paper and incubated at room temperature for 10 days. cabbage stems were first surface sterilized and then inoculated as leaf assays without any wounding. plants were incubated in a growth chamber and maintained at 25°c, 95% relative humidity on a 12-h fluorescent light/dark conditions for 7 days. leaves and stems only inoculated with pda plugs served as controls. inoculated leaves and stems showed brown, water soaked and softened lesions several centimeters around the inoculated area (fig. 2 in persian section). no symptoms were observed on control plants. inoculated fungi reisolated from symptomatic parts, so kochs postulates were completed. this is the first report of cabbage head rot on white and red cabbages caused by sclerotinia sclerotiorum from iran. in iran.

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

The First Report of Postharvest Stem Rot of Kohlrabi Caused by Sclerotinia sclerotiorum in Korea

In March 2014, a kohlrabi stem rot sample was collected from the cold storage room of Daegwallyong Horticultural Cooperative, Korea. White and fuzzy mycelial growth was observed on the stem, symptomatic of stem rot disease. The pathogen was isolated from the infected stem and cultured on potato dextrose agar for further fungal morphological observation and to confirm its pathogenicity, accordin...

متن کامل

analyzing patterns of classroom interaction in efl classrooms in iran

با به کار گیری روش گفتما ن شنا سی در تحقیق حا ضر گفتا ر میا ن آموزگا را ن و زبا ن آموزا ن در کلا سهای زبا ن انگلیسی در ایرا ن مورد بررسی قرار گرفت. ا هداف تحقیق عبا رت بودند از: الف) شنا سا ئی سا ختارهای ارتبا ط گفتا ری میا ن معلمین و زبا ن آموزا ن ب) بررسی تا ثیر نقش جنسیت دبیرا ن و زبا ن آموزان بر سا ختا رهای ارتبا ط گفتا ری میا ن آنها پ) مشخص کردن اینکه آ یا آموزگاران غا لب بر این ارتبا ط گف...

the impact of e-readiness on ec success in public sector in iran the impact of e-readiness on ec success in public sector in iran

acknowledge the importance of e-commerce to their countries and to survival of their businesses and in creating and encouraging an atmosphere for the wide adoption and success of e-commerce in the long term. the investment for implementing e-commerce in the public sector is one of the areas which is focused in government‘s action plan for cross-disciplinary it development and e-readiness in go...

First Report of Root Rot Caused by Plectosphaerella cucumerina on Cabbage in China

Severe root rot was observed in fields of cabbages (Brassica oleracea L.) in 2015 in China. Cardinal symptoms of this disease included root rot and wilting leaves. A fungus was isolated from diseased tissues consistently. Based on the morphological features and molecular analysis of the ITS-5.8S rDNA and D1/D2 domain of the 28S rRNA gene, it was identified as Plectosphaerella cucumerina. This i...

متن کامل

role of cultural iran in promotion of multilaieralism in central asia and caucasus

cultural iran is a scope that is more extended than the political territories of iran as a political unit. this concept means that cultural geography(mehdi moghanlo-1383-1) of iran is greater than its political geography which, according to history, has a long history extending west-east from kandahar to the euphrates and north-south from the persian gulf to the caucasus including transoxiana a...

15 صفحه اول

منابع من

با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید


عنوان ژورنال:
بیماریهای گیاهی

جلد ۴۹، شماره ۳، صفحات ۳۶۱-۳۶۲

کلمات کلیدی

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023