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Paper Information

Journal:   IRANIAN JOURNAL OF PLANT PATHOLOGY   SUMMER 2008 , Volume 44 , Number 2 (174); Page(s) 137 To 154.
 
Paper: 

IDENTIFICATION, PATHOGENICITY AND DISTRIBIUTION OF ALTERNARIA SPP. OF CANOLA IN IRAN

 
 
Author(s):  NOURANI S.L., MINASIAN VAHEH*, SAFAEI NASER
 
* DEPARTMENT OF PLANT PATHOLOGY, COLLEGE OF AGRICULTURE, TARBIAT MODARRES UNIVERSITY
 
Abstract: 
To identify the Alternaria spp. pathogenic to canola (Brassica napus L.), surveys of canol a fields were made during 2006- 2007 in the provinces of Golestan, Khuzestan, West Azarbeijan and the county of Karaj. Samples of the fungi on leaves, stems and pods showing light grey to dark brown spots were used to isolate and purify Alternaria spp. either by direct picking of single spores formed on the fresh diseased tissues, or by culturing pieces of surface- sterilized tissue on PDA or PCA. Out of 50 pure isolates, five species of Alternaria were identified according to identification keys. Results of pathogenicity tests on 40 day- old potted canola plants in greenhouse indicated that the disease severity (percent leaf area infection) was highest in the two species of A. brassicicola (69%) and A. raphani (56%); medium in A. brassicae (43 %); very slight in A. arborescense, whereas no disease symptoms developed in A. infectoria nor in the control treatments. Based on these finding, A. brassicicola and A. raphani appear to be the principal agents of Alternaria disease in canola. These four pathogenic species are reported for the first time on canol a from Iran. Also to determine the dominant species of the three main pathogenic Alternaria, samples of plant parts showing typical symptoms were randomly collected. Results reveald that A. raphani is apparently the dominant species on canol a in Khuzestan and West Azarbeijan where A. brassicae and A. brassicicola were not observed. In Golestan province, however, results showed that A. brassicae with isolation frequency of 85.44% were the most prevalent species and that. A. raphani and A. brassicicola were isolated in 13.24% and 7.67% of the cases. The overall results showed that A. raphani with 66.11%, was the most prevalent species and A. brassicae and A. brassicicola were isolated in 33.6% and 2.99% of the cases. Based on these findings, A. raphani is considered as the dominant species on canola in the three provinces that were surveyed.
 
Keyword(s): ALTERNARIA ARBORESCENSE, A. BRASSICAE, A. BRASSICICOW, A. INFECTORIA, A. RAPHANI, A. ALTERNATA, PATHOGENICITY, CANOLA AND IRAN
 
References: 
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