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Direct effects of cyclic selection fo longer seminal roots in spring barley (Hordeum vulgare L.)

100%

Gorny A. G.

Journal of Applied Genetics

1995

vol. 36

issue 1

17-26

Cyclic pedigree selection for longer seminal roots was performed in the F2, F3 and F4 generations of hybrid population of spring barley.The total length of roots was measured in seedlings grown in filter-paper rollers.The intensity of selectio was 20% (C1, C2 cycles) and 26% (C3).Selection wasceffective.On anaverage, the finally selected F5-pedigrees formed 6% longer seminal roots system than the initial F2's and much of them exibited 7-16% improved rooting when compared with the best parent in a sand-vermiculite pot culture.Realized heritability coefficient of the root length ranged from 0.21 to 0.37 when assessed by the ratio of selection response to selection differential, while those estimated by the parent-offspring regressions attained 0.40-0.53.The obtained results suggest that progeny evaluation and/or seletion delayed for later generations should be essential for more effective root selection in barley.

Evaluation of the response to limited water, nitrogen and phosphorus supply in spring barley genotypes selected for vigorous seminal roots

86%

Gorny A.

Journal of Applied Genetics

1996

vol. 37

issue 1

11-27

Fourteen F5- and F6-pedigrees previously selected for a more vigorous seminal root system in a cross population of spring barley, were compared with their parents in the response to severe post-sowing drought and limited N- and P-supply.The materials were studied in glass-faced soil boxes, sand-vermiculite cultures and in the field.The F5's juvenile rooting superiority was not totally preserved for further growth stages suggesting partly different genetic backgrounds responsible for the seminal root system at various growth stages.Results indicated an absence of close genetic correlations between the seminal and adventitious root systems.The selected spring barley pedigrees exibiting a more vigorous rooting benefit much more for their ability to avoid drought conditions than for their tolerance to nitrogen and phosphorus limitations.Especially under decreased N availability the enhanced root extension in F5s resulted in a depressed shoot dry matter production.Despite a relatively low differentiation in the grain yield, some of the selected F6-pedigrees were simultameously found to indicate a high yield potential, an improved stability or tolerance to low-input.

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2 Journal of Applied Genetics

1 1996

1 1995

1 Gorny A.

1 Gorny A. G.

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Direct effects of cyclic selection fo longer seminal roots in spring barley (Hordeum vulgare L.)

Evaluation of the response to limited water, nitrogen and phosphorus supply in spring barley genotypes selected for vigorous seminal roots