Physiological specialization in Puccinia triticina and postulated genes of resistance in certain Egyptian wheat cultivars
2005
Nagib, Muhammad A. | Bouiot, Usama A. | Mousa, Muhammad M. | Negm, Subhi S.
The annual survey of wheat leaf rust races and pathotypes during 2003/04 growing season resulted in the presence of 15 physiologic races of Puccinia triticina, ( 9 races of UN system). These races involved 99 pathotypes. The more frequent race was no. 60 (40.00%), followed by race 21 (16.19%) and race 130 (44.29%). The least ones in this regard were races 2, 99 and 153 (0.95%). Sharkiya Governorate followed by Beni Suef, Kena and Alexandria proved to comprise the highest frequencies of races during this season. Pathotypes; RHTT, MKTS, MKTT and RKTT were the most frequent. Furthermore, the most effective leaf rust resistant genes were; Lr's 37 (99.08%), 38(95.41%), 9 (90.83%),40 (88.79%), 45 (88.07), 39 (86.24%) and 2c (81.65%). However, high virulences were recorded with Lr's 1, 23, 3,17, 22 b, and 3 bg (92.59, 92.52, 89.91, 89.91, 89. 91 and 89.72%, in respect). Leaf rust resistant gene(s)postulated in 14 wheat cultivars, gave evidence t o the possibility of LPs 1 and 47 in Giza 160; Lr's1, l4band 14a in Giza 168; Lr's 1, 45and 46 in Giza 164; Lr's 1, and 10 in Giza 170 ; Lr's 23 and 46 in Gemmeiza 1; Lr's 14 a, 46, 47 and B in Gemmeiza 5 and Lr 23 in Gemmeiza 9. These results would serve as a fruitful tool in the wheat breeding program for disease resistance
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