Seed‐Parent Fecundity Distributions in Bee‐Pollinated Forage Legume Polycrosses

Riday, Heathcliffe

doi:10.2135/cropsci2016.09.0816

Cited by 2 publications

(13 citation statements)

References 19 publications

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“…The uneven pollen‐parent fecundity distribution in our trial corresponds to Riday, Reisen, Raasch, Santa‐Martinez, and Brunet () and Riday () who found that pollen‐parent fecundity distributions are uneven in polycrosses with most forage Legumes. The distribution in the present study could be somewhat biased due to the lower success rate of assigning parentage thus making certain pollen‐parents more likely to be identified based on rare SSR alleles.…”

Section: Discussionsupporting

confidence: 84%

“…The uneven pollen-parent fecundity distribution in our trial corresponds to Riday, Reisen, Raasch, Santa-Martinez, and Brunet TA B L E 3 Seed yield of progeny plants with high seed-yielding mothers and either a high seed-yielding father (marker-selected progeny) after cross-pollination and self-fertilization (if present), or a random father (traditionally selected progeny) (2015) and Riday (2017) who found that pollen-parent fecundity distributions are uneven in polycrosses with most forage Legumes.…”

Section: Marker-assisted Parentage Analysis Successfully Identifiedmentioning

confidence: 75%

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Marker‐assisted parentage analysis reveals high individual selfing rates in tetraploid red clover genotypes selected for seed yield

2019

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Seed yield is a major breeding target in tetraploid red clover. We investigated if marker‐assisted parentage analysis can identify progeny plants with two high seed‐yielding parents in tetraploid red clover and if this technique is more advantageous than traditional half‐sib selection. Parentage analysis was successfully performed on the progeny from the 10% highest seed‐yielding genotypes from a second‐cycle family selection trial: 16.0% of progeny were identified with a high seed‐yielding father. However, progeny plants with two high seed‐yielding parents did not produce more seeds than traditionally selected progeny (27.3 g vs. 30.7 g/plant, respectively). The 10% highest seed‐yielding genotypes displayed on average 2% self‐fertilization. Four genotypes were self‐fertile with individual selfing rates up to 20%. Our results discourage the use of marker‐assisted parentage analysis to improve seed yield in tetraploid red clover when the material has been preselected for seed yield. Breeders should be aware that intensive selection for seed yield in tetraploid red clover may inadvertently lead to selection for increased self‐fertility, which may increase inbreeding in the long term.

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Section: Discussionsupporting

confidence: 84%

Section: Marker-assisted Parentage Analysis Successfully Identifiedmentioning

confidence: 75%

Marker‐assisted parentage analysis reveals high individual selfing rates in tetraploid red clover genotypes selected for seed yield

2019

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“…1). Riday (2017) also observed preliminary evidence that seed‐parent and pollen‐parent fecundity distributions λ‐values were correlated. In this study sampling a larger number of polycrosses, we definitively observe that seed‐ and pollen‐parent fecundity distributions λ‐values are positively correlated.…”

Section: Discussionmentioning

confidence: 73%

“…1). The λ‐values 0.7 to 2.0 represent the 95th percentile observed by Riday (2017). Finally 1.2 was the median expected fecundity distribution λ‐value (Fig.…”

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confidence: 90%

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Red Clover Seed‐Parent and Pollen‐Parent Correlated Reproductive Success and its Relationship to Polycross Mating Metrics

2018

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Outbred forage species syn1 polycross seed production has a major impact on expected inbreeding depression in later seed increase generations. In this study, we examined the relationship between seed‐parent and pollen‐parent fecundity and how this relationship relates to other polycross mating metrics. Twelve bumble bee (Bombus impatience Cr.)‐pollinated red clover (Trifolium pratense L.) polycrosses ranging in size from 13 to 96 parents were evaluated for median seed yield per plant, seed‐parent fecundity Weibull distribution shape parameter λ‐values, pollen‐parent fecundity distribution λ‐values, and seed‐pollen‐parent fecundity correlations. Seed‐pollen‐parent fecundity correlations were significant and varied from r2 = 0.187 to 0.879 with a median value of 0.464. Seed‐pollen‐parent fecundity was negatively correlated with seed‐parent fecundity distribution λ‐values (r = −0.633), indicating that less panmictic polycross mating was associated with more correlated seed‐ and pollen‐parent fecundity. Multiple regression of a polycross's median seed yield per plant and seed‐parent fecundity distribution λ‐values onto seed‐pollen‐parent fecundity correlations revealed a positive slope with median seed yield per plant (partial r2 = 0.255) and a negative slope with seed‐parent fecundity distribution λ‐values (partial r2 = 0.400). This study reveals that seed‐ and pollen‐parent fecundity are correlated and that this correlation is higher when median seed yield per plant is lower and when polycross mating is less panmictic. To mitigate the impact of increased inbreeding due to this correlation, we recommend creating a stress‐free polycross environment that maximizes seed production per plant in the polycross.

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Seed‐Parent Fecundity Distributions in Bee‐Pollinated Forage Legume Polycrosses

Abstract: Abbreviations: Pf i , seed-parent fecundity frequency; SMOVC, polycross size standardized magnitude ordered value continuum; SPF, polycross size standardized Pf i .

Cited by 2 publications

References 19 publications

Marker‐assisted parentage analysis reveals high individual selfing rates in tetraploid red clover genotypes selected for seed yield

Marker‐assisted parentage analysis reveals high individual selfing rates in tetraploid red clover genotypes selected for seed yield

Red Clover Seed‐Parent and Pollen‐Parent Correlated Reproductive Success and its Relationship to Polycross Mating Metrics

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