Indirect selection for resistance to sclerotinia crown and stem rot on alfalfa

The possibility of improving seedling resistance to Sclerotinia trifoliorum (Eriks) by selecting seedlings of alfalfa (Medicago sativa L.) for resistance to sprays of oxalate solutions was investigated using four populations of alfalfa. Seedlings with two or three trifoliate leaves were sprayed with...

Full description

Saved in:
Bibliographic Details
Published in:Canadian journal of plant science 1984, Vol.64 (1), p.145-150
Main Authors: ROWE, D. E, WELTY, R. E
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
crown rot
disease resistance
Fundamental and applied biological sciences. Psychology
Generalities
Genetics and breeding of economic plants
Medicago sativa
Pest resistance
plant breeding
plant diseases
Sclerotinia trifoliorum
stem rot
Varietal selection. Specialized plant breeding, plant breeding aims
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The possibility of improving seedling resistance to Sclerotinia trifoliorum (Eriks) by selecting seedlings of alfalfa (Medicago sativa L.) for resistance to sprays of oxalate solutions was investigated using four populations of alfalfa. Seedlings with two or three trifoliate leaves were sprayed with 0.16 or 0.125 molar solutions of oxalate. The selections from each oxalate treatment in each population were polycrossed. Seedlings from remnant seed of screened populations and seed from respective polycrosses of selections for oxalate resistance were evaluated for resistance to oxalate and S. trifoliorum in the greenhouse. The selection for oxalate resistance at 0.16 molar treatment was effective in doubling the frequency of resistant seedlings. The realized heritabilities averaged 17.4 with [Formula: see text] of 1.83. The resistance to S. trifoliorum was regressed on resistance to oxalate. Only one of the four populations had a significant regression. Thus, a physiological relationship of resistance to oxalate and resistance to S. trifoliorum was not demonstrated and it was concluded that this selection procedure was unsatisfactory. Linkage and sampling error are discussed as possible causes for the single significant regression.Key words: Medicago sativa, Sclerotinia trifoliorum, selection response, heritability, disease resistance
ISSN:0008-4220
1918-1833
DOI:10.4141/cjps84-018