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PLANT GENETIC RESOURCES

Wheat-Alien Species Derivatives

A Novel Source of Resistance to Fusarium Head Blight in Wheat

^a Dep. of Plant Sciences, North Dakota State Univ., Fargo, ND 58105
^b Dep. of Plant Pathology, North Dakota State Univ., Fargo, ND 58105
^c USDA-ARS, Northern Crop Science Lab., Fargo, ND 58105

^* Corresponding author (xiwen.cai{at}ndsu.nodak.edu)

Fusarium head blight (FHB), caused mainly by Fusarium graminearum Schwabe, is a destructive disease of wheat (Triticum spp.) in humid growth conditions throughout the world. Genetic resistance of the host plant is considered the most effective and sustainable method of defense against FHB; however, only limited sources of resistance are available in wheat. Relatives of wheat have proven to be an invaluable gene pool for wheat improvement. The objective of this study was to explore relatives of wheat for FHB resistance. We evaluated 293 lines derived from the crosses of wheat with its relatives for resistance to spread of FHB infection over two greenhouse seasons. Of these 293 derivatives, 66 were susceptible, 153 appeared moderately resistant, and 74 lines exhibited a level of resistance comparable with T. aestivum L. ‘Sumai 3’, the most widely used source of resistance to FHB. Alien species involved in development of these derivatives include T. tauschii (Coss.) Schmal., Roegneria kamoji C. Koch, R. ciliaris (Trin.) Nevski, Leymus racemosus Lam., Thinopyrum ponticum (Podp.) Barkworth & D.R. Dewey, Th. elongatum (Host) D.R. Dewey, Th. junceum (L.) Love, Th. intermedium (Host) Barkworth & D.R. Dewey, Dasypyrum villosa L., Secale cereale L., and oat (Avena sativa L.). The wheat-alien species derivatives identified as resistant to FHB include wheat-alien species amphiploids, synthetic hexaploid wheat lines, and wheat-alien species substitution and translocation lines. These derivatives could serve as novel sources to enhance resistance of wheat to FHB.

Abbreviations: FHB, Fusarium head blight

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Crop Science 2005 45: vii. [Full Text]  

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