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A quantitative analysis of resistance to mycosphaerella blight in field pea
- Source :
- Crop Science. Jan-Feb, 2007, Vol. 47 Issue 1, p162, 6 p.
- Publication Year :
- 2007
-
Abstract
- Mycosphaerella blight, caused mainly by Mycosphaerella pinodes (Berk. and Blox.) Vestergren, is the most important foliar disease on field pea (Pisum sativum L.) in western Canada. A quantitative trait analysis of resistance to M. pinodes was undertaken on five crosses with reciprocals of P. sativum to examine broad-sense ([H.sup.2]) and narrow-sense ([h.sup.2]) heritability, minimum number of genes involved (MNG), mid-parent heterosis (MPH), cytoplasmic inheritance, and epistasis. Mean [H.sup.2] was 0.75 (range 0.67-0.80) and mean [h.sup.2] was 0.59 (range 0.41-0.70), indicating that additive variance is important and that improvement in resistance can be achieved through breeding. Mean MNG was 2.16 genes (range 0.06-6.22), indicating that genes for resistance differed among parent lines. Mean MPH was 50% (range 47-57%), indicating that heterosis did not influence the expression of resistance to M. pinodes. There was no difference between the mean of any [F.sub.1] population and its reciprocal, indicating lack of maternal inheritance. The mean of the epistatic points was -0.01 (range -0.1 to 0.12), indicating that epistasis was not important in these crosses. These results will further the understanding of the natural genetic diversity for disease resistance to M. pinodes in P. sativum.
Details
- Language :
- English
- ISSN :
- 0011183X
- Volume :
- 47
- Issue :
- 1
- Database :
- Gale General OneFile
- Journal :
- Crop Science
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.160279756