YOUSSEF, G., MARZOUK, I., EL-HARIRY, M. (1998). SCREENING AND DEVELOPING WHEAT LINES RESISTANT TO S. GRAM! NUM AND R.PAD!. Egyptian Journal of Agricultural Research, 76(2), 521-533. doi: 10.21608/ejar.1998.347302
GALAL S. YOUSSEF; IBRAHIM A. MARZOUK; MAGDY A. EL-HARIRY. "SCREENING AND DEVELOPING WHEAT LINES RESISTANT TO S. GRAM! NUM AND R.PAD!". Egyptian Journal of Agricultural Research, 76, 2, 1998, 521-533. doi: 10.21608/ejar.1998.347302
YOUSSEF, G., MARZOUK, I., EL-HARIRY, M. (1998). 'SCREENING AND DEVELOPING WHEAT LINES RESISTANT TO S. GRAM! NUM AND R.PAD!', Egyptian Journal of Agricultural Research, 76(2), pp. 521-533. doi: 10.21608/ejar.1998.347302
YOUSSEF, G., MARZOUK, I., EL-HARIRY, M. SCREENING AND DEVELOPING WHEAT LINES RESISTANT TO S. GRAM! NUM AND R.PAD!. Egyptian Journal of Agricultural Research, 1998; 76(2): 521-533. doi: 10.21608/ejar.1998.347302
SCREENING AND DEVELOPING WHEAT LINES RESISTANT TO S. GRAM! NUM AND R.PAD!
1Field Crops Research Institute, Agricultural Research Centre, Giza, Egypt
2Plant Protection Research Institute, Agricultural Research Centre, Dokki, Egypt
Abstract
A breeding program for screening and developing wheat lines resistant to aphid was conduted at ARC since 1986. Crosses were made between the two translocation lines each possessing a segment of a chromosome from the rye variety Insave x Giza 157, Sakha 61 and Sakha 69. Backcrossing was continued up to BC3/BC4. Individual plant selection based on resistance/tolerance to R.padi the most destructive aphid in Egypt, and desirable plant phenotype was followed. Each of the selected plants phenotype was followed. Each of the selected plants was grown in one row and selection was practiced within and among rows. Visually superior lines resistant/tolerant to aphids were included in yield trails for aphid screening and yield evaluation from 1991 and through 1996. Eight lines possessing varying degress of aphid resistance were experimented in two verification, two large and two small yield trials consisting of 11, 27 and 42 lines, respectively. The recurrent varieties Sakha 69 and Giza 164 were used as control in each experiment. Two fairly resistant lines to R.padi, exhibited grain yield to the recurrent, two moderate and 3 tolerant lines exhibited grain yield significantly two moderate and 3 tolerant lines exhibited grain yield significantly increased over the recurrent were achieved from the verification trials. these lines will be handed over to the Wheat Res. Section to be experimented in 11 location allover the country and for seed multiplication. Results from small and large trials will be confirmed in the coming seasons. These results positively assume that various levels of resistance can be combined with high grain yield and breeding for aphid resistance/tolerance can be achieved. Another phase of this program has been initiated using the resistant amphiploids Amigo, Largo and Shandawell 1 (produced in this work) x Giza 160, 163 and 164. A total of 720 lines selected from BC2 were subjected to artificial infestation with aphids in the greenhouse and natural infestation of R.padi in the field. Six lines (Largo x Giza 160) and 6 lines (Amigo x Giza 164) proved to be resistant to S.graminum under greenhouse conditions. An excess of resistant lines was obtained under field conditions against R.padi because infestation was light.
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