ISSN:
1573-5060
Keywords:
Hordeum vulgare
;
barley mutation
;
quantitative traits
;
soil fertility
;
nutrient stress
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary Selfed progenies of three barley (Hordeum vulgare L.) cultivars (‘Manker’, ‘Morex’ and ‘Unitan’) were produced from six generations of a dichotomous propagation scheme. One group of plants per cultivar (the L group) was propagated in a fertile soil mixture. Remnant seed of all generations was increased in a common environment in the field, and all progenies were evaluated in the field under low and high soil fertility. There were no overall differences between the H and L groups for biomass or grain yield, and no genotype x fertility interactions were significant. But when only lines in the sixth, or terminal, generation were considered, the L group had a significantly lower grain or biomass yield than the H group in half of the comparisons. The L group was never significantly higher for biomass or grain yield in generaton 6. Seven of 60 within-family genetic variance components were at least twice as large as their standard errors. Six of the seven significant variances were for generation 6 families within generation 5 families; of those, five were in the L groups. The genetic variance within cultivars could be attributed, not to residual heterozygosity or to constant mutation, but to an increasing mutation rate, primarily in the low-fertility propagation environment.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00051866
