EVALUATION OF SOME RAPESEED AND MUSTARD GENOTYPES FOR RESISTANCE TO WHITE RUST D1SEASE CAUSED BY Albugo candida | ||||
| Journal of Plant Production | ||||
| Article 6, Volume 30, Issue 9, September 2005, Page 5149-5158 PDF (138.02 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2005.237467 | ||||
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| Authors | ||||
| Eetmad E. Draz,1; M. E. Abo-Ghazala2 | ||||
| 1Plant Pathology Research Institute, ARC. Egypt | ||||
| 2Field Crops Research Institute, ARC, Egypt | ||||
| Abstract | ||||
| One hundred and six Brassica genotypes of four species i.e. B. nap us, B. juncea, B. campestris, B. carinala were evaluated tor resistance to white rust (caused by Albugo candida) at seedling stage under controlled conditions (in greenhouse. unde~ artificial epiphy1o\ic conditions) and at adult stage under natural conditions, during the two successive growing seasons 2002103 and 2003104 in the experimental farm 01 Sakha Agricultural Research Station, Kafr EI-Sheikh, Egypt. At seedling stage, all B. napus lines (55 lines). 4 lines (B. campestris) and 3 lines (B. carinala) were completely resistant. Four lines of B. juncea were moderately resistant. while twenty lines or both B. juncea and B. cempesiris were moderately susceptible. The rest of the tested lines (B. juncea) were susceptible. At adult stage, the results showed that 60 lines of B. nap < /em>us,B. camp < /em>eslris and B. cetinets were free from disease during the two growing seasons. whereas 6 lines of B. juncea and 4 lines of B. cemp < /em>estris exhibited resistance or moderate resistance response during the two seasons. Thirteen lines were moderately susceptible during 2002/03 and eight lines during 2003/04. The rest 01 the tested lines were susceptible or highly susceptible during the two seasons. The obtained results also showed that. the most susceptible lines had similar consistent percent of disease severity, in general, Ihrough the two growing seasons. Ten lines of B. juncea were used to study the occurrence and development of while rust disease under natural field conditions. The results indicated thai, almost all of the tested lines gave high reaction (local infec1ion, as pustules on leaves). As regard to systemic infection (Slag-head formations), the obtained results indicated that the highest values of stag-head/piant were recorded with line i.e.B. juncea Int. 233that showed severe infection with the disease progress, followed by lines I.e. Int. 239 and \1'\\. 234 that exhibited moderate infection; lines Le. Int. 333. Int. 160 and Int. 151 thai showed slight Infection. While, lines i.e. Int. 176, Int. 237 and Int. 246 remained free from symptoms (stag-head formations) although it had localized pustules on leaves. In general, the present wor1( would be of a great importance and fruitfull tool in screening and evaluating canota crop against while rust disease. | ||||
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