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Provedor de dados:  Inra
País:  France
Título:  Recherche sur ble d'un parametre de tolerance a Septoria nodorum: teneur des epis en acide abscissique
Investigation for assessing the tolerance of winter wheat to Septoria nodorum : ABA content in ears
Autores:  Bousquet, J.F.
Touraud, G.
Piollat, M.T.
Bosch, U.
Trottet, M.
Data:  1991
Ano:  1991
Palavras-chave:  BLE D'HIVER
PHAEROSPHAERIA NODORUM
SEPTORIOSE
SELECTION
SYMPTOME
INFECTION
STADE DE DEVELOPPEMENT
Resumo:  Cinq cultivars de blé d’hiver représentant un gradient de tolérance à la septoriose sont contaminés à 2 stades de leur développement. La concentration en acide abscissique (ABA) est déterminée dans les épis aux stades laiteux et pâteux du grain. Les symptômes sur feuilles et épis sont notés en cours de végétation. Le poids de 1 000 grains est mesuré à la récolte. L’ABA s’accumule dans les épis septoriés proportionnellement aux symptômes observés. Le niveau de la relation entre les pertes de rendement et l’accumulation d’ABA dépend du stade de développement de la plante au moment de l’infection. L’utilisation de l’accumulation d’ABA en tant que marqueur de la tolérance est discutée.

Five winter wheat varieties showing differences in tolerance to Septoria nodorum were inoculated at the stages of stem extension and early heading. Abscissic acid (ABA) content was determined in the ears at milky and mealy stages. Disease ratings were made on symptoms developing on ears and flag leaves and on the yield expressed in 1 000-grain weight (table I). The infected ears accumulated ABA and this accumulation was highly correlated with ear symptoms (table II and fig 1). The level of the relationship between yield losses and ABA accumulation depends on the growth stage of the plant at the time of infection. When the infection took place at the stage of stem extension, there was a high correlation between yield losses and ABA accumulation in the ears of the latest maturing cultivars (fig 2). The earliest maturing cultivar (Talent) showed a significant accumulation of ABA from the milky stage but without correlation with yield losses. These observations suggest that there is a critical period during grain development and maturation. The use of ABA accumulation as marker of tolerance is examined.
Tipo:  Journal Article
Idioma:  Francês
Identificador:  http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9400014684040577&uri=/notices/prodinra1/2009/06/

http://www.prodinra.inra.fr/prodinra/pinra/data/2009/06/PUB940001468404057_20090623085612229.pdf
Formato:  application/pdf
Fonte:  Agronomie. 1991, 11 (9) : 777-785
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