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Importance et spectre de virulence de la rouille noire du blé (P. graminis)
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ISBN10: 6209258751
ISBN13: 9786209258756
Publisher: Editions Notre Savoir
Published: Nov 18 2025
Pages: 72
Weight: 0.24
Height: 0.17 Width: 6.00 Depth: 9.00
Language: French
ISBN13: 9786209258756
Publisher: Editions Notre Savoir
Published: Nov 18 2025
Pages: 72
Weight: 0.24
Height: 0.17 Width: 6.00 Depth: 9.00
Language: French
Sur les 77 champs de blé évalués le long de cinq itinéraires de l'est de Showa, dans le centre de l'Éthiopie, 30 (38,9 %) ont été touchés par la rouille noire. L'étude de la variabilité de P.graminis f. sp. tritici a permis d'identifier 16 races, dont la race SRKSF, la plus répandue avec une fréquence de 14,3 %, et les races TTKSK et TTTTF, les plus virulentes avec des fréquences respectives de 7,1 % et 3,6 %. L'hôte différentiel portant le gène Sr24 s'est révélé efficace contre toutes les races, tandis que le gène Sr36 était résistant à 85,7 % des races identifiées. En revanche, les hôtes différentiels portant les gènes SrMcN, Sr9g et Sr11 se sont révélés inefficaces contre respectivement 100 %, 82,1 % et 82,1 % des races identifiées. En outre, dix variétés de blé dur évaluées au stade de croissance adulte de la plante par rapport à la population de rouille des tiges de Debrezeit ont présenté des degrés de gravité allant de 20S pour la variété Geredo à 70S pour la variété Foka, tandis qu'à Ambo, seule la variété témoin sensible, Morocco, a été infectée jusqu'à 20S. Au stade de semis, 60 % des variétés testées avec l'isolat virulent de rouille des tiges de Debrezeit ont montré une résistance, tandis que toutes les variétés étaient résistantes à l'isolat d'Ambo. Les résultats ont indiqué que la rouille des tiges de Debrezeit était virulente pour les variétés de blé dur.
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