Virulence analysis of wheat powdery mildew races during 2019–2020 seasons in Egypt

Author(s):  
Moustafa Mahmoud El-Shamy ◽  
Mona Elsayed Mohamed
Plant Disease ◽  
2016 ◽  
Vol 100 (9) ◽  
pp. 1927-1930 ◽  
Author(s):  
Moustafa M. El-Shamy ◽  
Hassan M. Emara ◽  
Mona E. Mohamed

Wheat powdery mildew (Blumeria graminis f. sp. tritici) has increased in Delta Egypt in recent years as a result of growing susceptible cultivars of bread wheat. Fifty-two isolates of B. graminis f. sp. tritici collected in 2013 and 2014 from commercial fields in five provinces were analyzed for virulence, using 21 genes conferring resistance to powdery mildew (Pm genes) as well as 12 local wheat cultivars. First true leaves of 10-day-old wheat differentials were inoculated with isolates derived from a single pustule of B. graminis f. sp. tritici. No virulence to the resistance genes Pm3d, Pm12, Pm16, Pm24, Pm35, Pm36, and Pm37 was detected, indicating that these genes could be used for resistance breeding. Virulence to Pm2, Pm4a, and Pm6 was low, while high virulence to genes Pm1a, Pm3a, Pm3c, Pm3f, Pm5a, Pm7, Pm8, Pm9, and Pm17 was found, indicating that breeders should be very cautious in using these genes. At the adult stage, genes Pm2, Pm3d, Pm3f, Pm4a, Pm6, Pm12, Pm16, Pm17, Pm24, Pm35, Pm36, and Pm37 were completely effective in both years. All the tested Egyptian wheat cultivars were susceptible under natural field conditions. The virulence of B. graminis f. sp. tritici population and resistance Pm genes have been assessed for the first time in Egypt.


2021 ◽  
Author(s):  
Deshan Xie ◽  
Xuewei Cai ◽  
Chunping Yang ◽  
Linjun Xie ◽  
Guangwei Qin ◽  
...  

2021 ◽  
Vol 693 (1) ◽  
pp. 012124
Author(s):  
Jinling Zhao ◽  
Guomin Chu ◽  
Hao Yan ◽  
Lei Hu ◽  
Yongan Xue

1995 ◽  
Vol 43 (1) ◽  
pp. 47-52 ◽  
Author(s):  
Miroslav Švec ◽  
Marta Miklovičová ◽  
Milan Sýkora ◽  
Eduard Krippel

2000 ◽  
Vol 78 (10) ◽  
pp. 1288-1293 ◽  
Author(s):  
Jérôme Muchembled ◽  
Anissa Lounès-Hadj Sahraoui ◽  
Anne Grandmougin-Ferjani ◽  
Michel Sancholle

The total sterol composition of conidia of the obligate plant pathogen Blumeria (= Erysiphe) graminis f.sp. tritici has been analysed as a function of their ontogeny during sporulation. Two main classes of sterols were characterized: 24-ethylsterols (24-ethylcholesta-5,22-dienol, 24-ethylcholesterol, and Δ5-avenasterol) and 24-methylsterols (24-methylenecholesterol and episterol). Our results show that sterol composition is greatly modified during ontogeny of B. graminis conidia both at the qualitative and quantitative levels. In particular, 24-methylsterols, e.g., 24-methylenecholesterol and episterol, are the major sterols in old conidia whereas 24-ethylsterols, e.g., 24-ethylcholesta-5,22-dienol, 24-ethylcholesterol, and Δ5-avenasterol, are the main sterols in young conidia.Key words: Erysiphe, wheat powdery mildew, sterols, ontogeny.


PROTOPLASMA ◽  
2014 ◽  
Vol 252 (4) ◽  
pp. 1167-1179 ◽  
Author(s):  
Yulin Cheng ◽  
Juanni Yao ◽  
Hongchang Zhang ◽  
Lili Huang ◽  
Zhensheng Kang

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