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CROP BREEDING & GENETICS

A Quantitative Analysis of Resistance to Mycosphaerella Blight in Field Pea

^a Alberta Research Council, Vegreville, AB Canada T9C 1T4
^b Alberta Agriculture, Food and Rural Development, Crop Diversification Centre North, Edmonton, AB Canada T5Y 6H3
^c Alberta Agriculture, Food and Rural Development, Field Crop Development Centre, Lacombe, AB Canada T4L 1W1
^d Agriculture and Agri-Food Canada, Saskatoon Research Centre, Saskatoon, SK Canada S7N 0X2
^e Univ. of Alberta, Edmonton, AB Canada T5B 4K3

^* Corresponding author (Sheau-Fang.Hwang{at}gov.ab.ca)

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 (H²) and narrow-sense (h²) heritability, minimum number of genes involved (MNG), midparent heterosis (MPH), cytoplasmic inheritance, and epistasis. Mean H² was 0.75 (range 0.67–0.80) and mean h² 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 F₁ 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.

Abbreviations: ADD, average degree of dominance • H², broad-sense heritability • h², narrow-sense heritability • MNG, number of genes involved • MPH, midparent heterosis

This article has been cited by other articles:

				R. X. Zhang and B. D. Gossen Heritability Estimates and Response to Selection for Resistance to Mycosphaerella Blight in Pea Crop Sci., November 7, 2007; 47(6): 2303 - 2307. [Abstract] [Full Text] [PDF]