Seed Yield Characteristics of Alfalfa Populations Selected for Receptacle Diameter and Nectar Volume

Teuber, Larry R.; Rincker, C. M.; Barnes, D. K.

doi:10.2135/cropsci1990.0011183x003000030023x

Cited by 15 publications

(10 citation statements)

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“…Interestingly, seed production varied negatively with nectar characteristics in the syn-4 population, as did the outcrossing rate. This negative relation is opposite to that reported by Teuber et al (1990) for alfalfa. Nevertheless, the inconsistent effects of floral design on seed production among the two populations suggest that artificial selection would be better directed towards aspects of flower production and display.…”

Section: Effects Of Floral and Inflorescence Traits On Yield And Yielcontrasting

confidence: 99%

New strategies for increasing heterozygosity in crops: Vicia faba mating system as a study case

Suso

Harder

Moreno³

et al. 2005

Euphytica

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Our research assesses the feasibility of using artificial selection on pre-mating floral traits to modify the mating system of faba bean (Vicia faba). This analysis considered two synthetic populations, which were derived from different genetic pools and had undergone five years of multiplication. For these populations, we identified floral and inflorescence traits that influence outcrossing per plant and examined the relative importance of these traits in governing yield. Codominant isozyme loci and the mixed-mating model were used to estimate the multilocus female outcrossing rate. A maternal half-sib design was used to evaluate the additive genetic component of floral and inflorescence traits, yield and yield components. Multiple regression was used to assess the effects of floral and inflorescence traits on outcrossing and yield and components of yield. The two populations exhibited mixing mating. Self-fertilization appears to result from the action of pollinating bees, so that its incidence could be modified by selection on floral and inflorescence traits that affect pollination. Floral and inflorescence traits affected individual differences in outcrossing unequally, with most variation being associated with the numbers of displayed flowers and inflorescences. Variation among plants in reward traits and in shape, although statistically significant, had limited and inconsistent influences on individual differences in outcrossing. Yield and its components varied strongly with aspects of floral display and, to a lesser extent, floral design, except for seed weight. Overall, our results imply that both outcrossing and yield could be enhanced by selection for plants that produce more inflorescences, each with relatively few flowers.

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Section: Effects Of Floral and Inflorescence Traits On Yield And Yielcontrasting

confidence: 99%

New strategies for increasing heterozygosity in crops: Vicia faba mating system as a study case

Suso

Harder

Moreno³

et al. 2005

Euphytica

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show abstract

“…For crop plants, especially alfalfa (Medicago sativa), there is more evidence (Pedersen, 1953;Hawkins, 1971;Walker et al, 1974;Teuber & Barnes, 1979;Teuber et al, 1990). Nectar production rate frequently varies strongly with abiotic factors (e.g.…”

Section: Discussionmentioning

confidence: 99%

Heritability of floral traits for the perennial wild flower Penstemon centranthifolius (Scrophulariaceae): clones and crosses

1993

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Floral and reproductive traits frequently influence pollinator behaviour and plant reproductive success and are therefore thought to be under selection. However, for wild plant populations there is little information on the amount of genetic variation for such traits. We estimated broad-and narrow-sense heritability of floral and reproductive traits for two populations of the perennial wildflower Penstemon centranthifolius, using a paternal half-sib crossing design in one case, and clonal propagation of ramets from different genets in the other. In both designs, most traits were significantly heritable, including nectar production, corolla length and width, inflorescence length and total flower production. Flowering date was significantly heritable for the crosses, but not for the clones, while nectar sugar concentration was not significantly heritable in either design. Genetic correlations were in some cases strong, and in some cases differed greatly from the corresponding phenotypic correlations. These results indicate that P. centranthifolius harbours a large reservoir of genetic variance which could support an evolutionary response to phenotypic selection.

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“…Evidence for genetic variation in nectar production rates has been found in cultivated alfalfa (Pedersen 1953a, b;Teuber and Barnes 1979;Teuber et al 1990) and clover (Shuel 1952;Hawkins 1971), and in a wild population of Mirabilis multi¯ora (Hodges 1995), but only one previous study has estimated the heritability of nectar production in wild plants. Using paternal half-sibs and clonal replicates, Mitchell and Shaw (1993) calculated both broad-sense and narrow-sense heritabilities for nectar production in Penstemon centranthifolius, a perennial wild¯ower.…”

Section: Heritabilitymentioning

confidence: 99%

“…Low heritability would limit the opportunity for a genetic response to selection (sensu Endler 1986), even if pollinator discrimination among nectar production genotypes led to dierences in individual plant ®tness. While there is some information on the heritability of nectar production rates in agricultural settings (Pedersen 1953a,b;Hawkins 1971;Teuber and Barnes 1979;Teuber et al 1990), almost nothing is known about the heritability of this trait in natural populations (but see Mitchell and Shaw 1993).…”

Section: Introductionmentioning

confidence: 99%

Sources of variation in floral nectar production rate in Epilobium canum (Onagraceae): implications for natural selection

Boose

1997

Oecologia

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Sources of variation in floral nectar production were investigated in a natural population of Epilobium canum (Onagraceae), a hummingbird-pollinated herbaceous shrub. Field measurements showed significant phenotypic variation among plants in floral nectar production rates. Average variance among flowers within plants was approximately one-third to one-half as great as variance among plants, with coefficients of variation among flowers ranging from 6.5% to 116.7%. A greenhouse experiment using clonally propagated ramets from field plants showed significant genetic variation for nectar production rates; broad sense heritability was estimated to have a maximum value of 0.64. In the greenhouse, plants grown under low water or low light conditions produced approximately 25% less nectar on average than those grown under control conditions. However, significant genotype-environment interactions indicated that genets differed in their responses to the changes in conditions. Rank correlations for genet mean nectar production rates across environmental conditions were low, and in two out of three comparisons were not different from zero. It is concluded that although the opportunity for natural selection on nectar production rates exits in this population, the response to selection will likely be slow, and the opportunity for selection of a narrow-optimum nectar production phenotype may be limited.

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Seed Yield Characteristics of Alfalfa Populations Selected for Receptacle Diameter and Nectar Volume

Cited by 15 publications

References 0 publications

New strategies for increasing heterozygosity in crops: Vicia faba mating system as a study case

New strategies for increasing heterozygosity in crops: Vicia faba mating system as a study case

Heritability of floral traits for the perennial wild flower Penstemon centranthifolius (Scrophulariaceae): clones and crosses

Sources of variation in floral nectar production rate in Epilobium canum (Onagraceae): implications for natural selection

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