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IMBABY, I., SHERIF, S., EL- NASHAR, F., ASHOUSH, H. (2000). VIRULENCE AND PATHOGENICITY ASSOCIATIONS IN P (JCCINIA GRAMINIS F. SP. TRITICI IN EGYPT DURING 1996-1998 CROP SEASONS. Egyptian Journal of Agricultural Research, 78(2), 545-557. doi: 10.21608/ejar.2000.321963
IBRAHIM A. IMBABY; SALAH E. SHERIF; FATEN K. EL- NASHAR; HASSAN A. ASHOUSH. "VIRULENCE AND PATHOGENICITY ASSOCIATIONS IN P (JCCINIA GRAMINIS F. SP. TRITICI IN EGYPT DURING 1996-1998 CROP SEASONS". Egyptian Journal of Agricultural Research, 78, 2, 2000, 545-557. doi: 10.21608/ejar.2000.321963
IMBABY, I., SHERIF, S., EL- NASHAR, F., ASHOUSH, H. (2000). 'VIRULENCE AND PATHOGENICITY ASSOCIATIONS IN P (JCCINIA GRAMINIS F. SP. TRITICI IN EGYPT DURING 1996-1998 CROP SEASONS', Egyptian Journal of Agricultural Research, 78(2), pp. 545-557. doi: 10.21608/ejar.2000.321963
IMBABY, I., SHERIF, S., EL- NASHAR, F., ASHOUSH, H. VIRULENCE AND PATHOGENICITY ASSOCIATIONS IN P (JCCINIA GRAMINIS F. SP. TRITICI IN EGYPT DURING 1996-1998 CROP SEASONS. Egyptian Journal of Agricultural Research, 2000; 78(2): 545-557. doi: 10.21608/ejar.2000.321963

VIRULENCE AND PATHOGENICITY ASSOCIATIONS IN P (JCCINIA GRAMINIS F. SP. TRITICI IN EGYPT DURING 1996-1998 CROP SEASONS

Article 4, Volume 78, Issue 2, July 2000, Page 545-557  XML PDF (3.32 MB)
Document Type: Original Article
DOI: 10.21608/ejar.2000.321963
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Authors
IBRAHIM A. IMBABY1; SALAH E. SHERIF2; FATEN K. EL- NASHAR2; HASSAN A. ASHOUSH1
1Field Crops Research Institute, Agricultural Research Center, Giza, Egypt
2Plant Pathology Research Institute, Agricultural Research Center, Giza, Egypt
Abstract
In Egypt, wheat stem rust survey gave evidence to the presence of ten races (11. 14, 15, 17, 19. 24, 34, 39, 53 and 122) in 1996, five races (10, 11, 14. 15, and 39) in 1997 and eight races (4, 10, 11. 24, 34, 39, 98 and 207) in 1998 growing seasons. Over the three years of study, races 11 and 39 were the most common representing and 31.86 % frequency, respectinly. Over the three ;ears of study, frequency of virulence among the fifty-six identified isolates on ninteen monogenic lines was determined. The most effective gene was Gt+ exhibiting 67.88% efficacy. On the other hand, the other genes showed susceptibility for the tested iso‌lates. The Pathogenicity Association Coefficient (PAC) and Virulence Association Coefficient (VAC) were determined. Most of the gene pairs were effective with low PAC and VAC or nearty equal values of PAC and VAC. 
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