Relation between Yielding Ability and Homozygosis in Barley Crosses<sup>1</sup>

Immer, F. R.

doi:10.2134/agronj1941.00021962003300030002x

Cited by 57 publications

(21 citation statements)

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“…In cereals it has been found by HARLAN et al (1940), HARRING-TON (1940) and IMMER (1941), but not by A'rKINS & MURPHY (1949) and FOWLER & HEYNE (1955), that early generation bulk hybrid yields are indicative of cross potential as assessed in later generations. Similarly in soya beans no such relationship has been established (KACTON, 1948;WEISS et al, 1947).…”

Section: Introductionmentioning

confidence: 95%

The estimation of cross yield using early generation and parental yields in dry beans (Phaseolus vulgaris L.)

Hamblin

Evans

1976

Euphytica

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Section: Introductionmentioning

confidence: 95%

The estimation of cross yield using early generation and parental yields in dry beans (Phaseolus vulgaris L.)

Hamblin

Evans

1976

Euphytica

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“…Outcrossed progeny will also be more fit than selfed progeny if there is true overdominance for fitness. Hence, the performance of selfed progeny is usually lower than that ofoutcrossed progeny-even in habitually self-pollinating populations (e.g., self-pollinating crops : Immer, 1941;Robinson et aI., 1954;Jinks and Mather, 1955;Williams, 1959;Matzinger, 1963;Simmonds, 1979;Gutierrez and Singh, 1985;Shamsuddin, 1985;and natural populations: see Table 3 of Charlesworth and Charlesworth, 1987). Although inbreeding depression is commonly observed in inbreeding populations, the frequencies of deleterious recessive alleles in inbreeding populations are expected to be lower than in randomly mating populations because the higher homozygosity in inbred populations exposes more deleterious recessive genes to selection (Stebbins, 1950;Jinks and Mather, 1955;Wright, 1969;Kimura and Ohta, 1971;Mather, 1973;Ohta and Cockerham, 1974;Heller and Maynard Smith, 1979;Shields, 1982;Lande and Schemske, 1985;Uyenoyama, 1986).…”

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confidence: 99%

INBREEDING EFFECTS IN CLARKIA TEMBLORIENSIS (ONAGRACEAE) POPULATIONS WITH DIFFERENT NATURAL OUTCROSSING RATES

1990

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Abstract. -Inbreeding depression is commonly observed in natural populations. The deleterious effects of forced inbreeding are often thought to be less pronounced in populations with seifpollinating mating systems than in primarily outcrossing populations. We tested this hypothesis by comparing the performance of plants produced by artificial self-and cross-pollination from three populations whose outcrossing rate estimates were 0.03, 0.26, and 0.58. Outcrossing rates and inbreeding coefficients were estimated using isozyme polymorphisms as genetic markers. Analysis of F statistics suggests that biparental inbreeding as well as self-fertilization contribute to the level of homozygosity in the seed crop. Biparental inbreeding will reduce the heterozygosity of progeny produced by outcrossing, relative to random outcrossing expectations, and hence will reduce the effects of outcrossing versus self-fertilization. Heterotic selection may increase the average heterozygosity during the life history. Selfed and outcrossed seeds from all three populations were equally likely to germinate and survive to reproduce. However, inbreeding depression was observed in fecundity traits of plants surviving to reproduction in all three populations. Even in the population whose natural self-fertilization rate was 97%, plants grown from seed produced by self-pollination produced fewer fruits and less total seed weight than plants grown from outcrossed seed. There was no detectable inbreeding depression in estimated lifetime fitness. Inbreeding effects for all reproductive yield characters were most severe in the accession from the most outcrossing population and least severe in the accession from the most self-fertilizing population.

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“…Using a male sterile factor pair to facilitate hybrid seed production in barley, Suneson and Riddle (47) found a 20$ yield advantage for the F^ over both parents. Immer (30) found increases of the F^ over the midparent of 8.3$, 11.1$ for number of seeds per head and 2?.3$ for yield per plant.…”

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confidence: 95%

Genotypic Correlations, Dominance, and Heritability of Quantitative Characters in Oats¹

Petr¹,

Frey²

1966

Crop Science

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Three methods of estimating dominance were applied to F1 data on plant height, panicle number, heading date, number of spikelets per panicle, number of panicles per plant, and grain yield from the 15 diallel crosses among 6 oat varieties. Genotypic correlations and heritability percentages, in the broad sense, were calculated for the F2.In general, the dominance values from the 3 methods of estimation were in good agreement with one another and with the observed effects. Overdominance was indicated for number of panicles per plant in the F1 whereas estimates for yield ranged from partial to overdominance. Partial dominance was indicated for short panicles and plant height. Earliness of heading was partially dominant in both the F1 and F2 and few spikelets per panicle were partially dominant.The heritability percentages were 33, 53, 54, 61, 74, and 87 for number of panicles per plant, grain yield, panicle length, plant height, number of spikelets per panicle, and heading date, respectively. The genetic correlations between plant height, panicle length, number of spikelets, heading date, and grain yield were positive, and most of them were relatively high.The heritability percentages and high levels of dominance for yield and panicles per plant observed in the F1 indicate that selection for these attributes should be delayed until later generations. Selection for plant height, panicle length, number of spikelets and heading date should be feasible in early generations.

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Relation between Yielding Ability and Homozygosis in Barley Crosses¹

Cited by 57 publications

References 0 publications

The estimation of cross yield using early generation and parental yields in dry beans (Phaseolus vulgaris L.)

The estimation of cross yield using early generation and parental yields in dry beans (Phaseolus vulgaris L.)

INBREEDING EFFECTS IN CLARKIA TEMBLORIENSIS (ONAGRACEAE) POPULATIONS WITH DIFFERENT NATURAL OUTCROSSING RATES

Genotypic Correlations, Dominance, and Heritability of Quantitative Characters in Oats¹

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Relation between Yielding Ability and Homozygosis in Barley Crosses1

Cited by 57 publications

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The estimation of cross yield using early generation and parental yields in dry beans (Phaseolus vulgaris L.)

The estimation of cross yield using early generation and parental yields in dry beans (Phaseolus vulgaris L.)

INBREEDING EFFECTS IN CLARKIA TEMBLORIENSIS (ONAGRACEAE) POPULATIONS WITH DIFFERENT NATURAL OUTCROSSING RATES

Genotypic Correlations, Dominance, and Heritability of Quantitative Characters in Oats1

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Relation between Yielding Ability and Homozygosis in Barley Crosses¹

Genotypic Correlations, Dominance, and Heritability of Quantitative Characters in Oats¹