ISSN:
1435-0653
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Stagonospora nodorum (Berk.) blotch (SNB) is a fungal disease that affects all aboveground parts of wheat (Triticum aestivum L.) plants. Stagonospora nodorum blotch causes serious losses in grain yield and seed quality of wheat grown in southeastern USA. The objective of this study was to conduct a genetic analysis of components of partial resistance to SNB wheat. Ten lines of soft and hard winter wheats that varied in resistance to SNB were used in two sets of intra-wheat-class half-diallel matings. Seedling plants of parents, F1 crosses, and F2 populations were inoculated at the two-leaf stage with spores of SNB in a humidity chamber to determine incubation period (IP), latent period (LP), and necrosis percentage (NP). The analysis of variance (ANOVA) showed highly significant differences for IP and NP among hard wheat crosses in both F1 and F2 generations. Highly significant differences for IP were noted among soft wheat F1 and F2 crosses. General combining ability (GCA) was found to be the major component of variation among crosses. For hard wheats, both IP and NP of partial resistance had significant GCA effects, but none had significant specific combining ability (SCA) effects. The results from soft wheat also indicated that GCA was more important than SCA in the inheritance of resistance to SNB. Two hard wheat parents, TX84V344 and SWM14240, and one soft wheat parent, 18NT should be very useful as SNB-resistant breeding lines.
Type of Medium:
Electronic Resource
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