How does genome size affect the evolution of pollen tube growth rate, a haploid performance trait?

Reese, John B; Williams, Joseph H.

doi:10.1101/462663

Cited by 2 publications

(2 citation statements)

References 135 publications

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“…These results join a growing body of evidence that points to potential developmental costs of maintaining large genomes. Across a diversity of species, genome size has been correlated with a suite of characteristics, including plant size (Munzbergova 2009; Carta and Peruzzi 2016), growth rate (Fridley and Craddock 2015), pollen tube growth (Reese and William 2019), seed size (Beaulieu et al 2007), flowering time (eg. Benor et al .…”

Section: Discussionmentioning

confidence: 99%

Genome size variation and evolution during invasive range expansion in an introduced plant

Cang

Welles

Wong

et al. 2022

Preprint

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Plants demonstrate some of the greatest variation in genome size among eukaryotes, and their genome sizes can vary dramatically across individuals and populations within species. This genetic variation can have consequences for traits and fitness, but few studies have been able to attribute genome size differentiation to ecological and evolutionary processes. Biological invasions present particularly useful natural laboratories to infer selective agents that might drive genome size shifts across environments and population histories. Here, we test hypotheses for the evolutionary causes of genome size variation across 14 invading populations of yellow starthistle, Centaurea solstitialis, in California, USA. We use a survey of genome sizes and trait variation to ask: (1) Is variation in genome size associated with developmental trait variation? (2) Are genome sizes smaller toward the leading edge of the expansion, consistent with selection for 'colonizer' traits? Or alternatively, does genome size increase toward the leading edge of the expansion, consistent with predicted consequences of founder effects and drift? (3) Finally, are genome sizes smaller at higher elevations, consistent with selection for shorter development times? We found that 2C DNA content varied 1.21-fold among all samples, and was associated with flowering time variation, such that plants with larger genomes reproduced later, with lower lifetime capitula production. Genome sizes increased toward the leading edge of the invasion, but tended to decrease at higher elevations, consistent with genetic drift during range expansion but potentially strong selection for smaller genomes and faster development time at higher elevations.

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Section: Discussionmentioning

confidence: 99%

Genome size variation and evolution during invasive range expansion in an introduced plant

Cang

Welles

Wong

et al. 2022

Preprint

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“…Compared to other monocots, this is slow to moderate pollen tube growth. Most monocots have PTGRs >500 μm/h, and the angiosperm median is 587 μm/h (Williams, ; Reese and Williams, ). In Alismataceae, the cleistogamous species Ranalisma rostratum and Sagittaria guyanensis both have much greater PTGRs of 1600 μm/h (Wang et al., , ; Williams, ).…”

Section: Discussionmentioning

confidence: 99%

Reproductive ecology and postpollination development in the hydrophilous monocot Ruppia maritima

Taylor

Giffei

Dang

et al. 2020

American J of Botany

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Premise Water‐pollination (hydrophily) is a rare but important pollination mechanism that has allowed angiosperms to colonize marine and aquatic habitats. Hydrophilous plants face unique reproductive challenges, and many have evolved characteristic pollen traits and pollination strategies that may have downstream consequences for pollen performance. However, little is known about reproductive development in the life history stage between pollination and fertilization (the progamic phase) in hydrophilous plants. The purpose of this study was to characterize reproductive ecology and postpollination development in water‐pollinated Ruppia maritima L. Methods Naturally pollinated inflorescences of R. maritima were collected from the field. Experimental pollinations using both putatively outcross and self pollen were conducted in the greenhouse and inflorescences were collected at appropriate intervals after pollination. Pollen reception, pollen germination, pollen tube growth, and carpel morphology were characterized. Results Ruppia maritima exhibits incomplete protogyny, allowing for delayed selfing. Pollen germinated within 15 min after pollination. The average shortest possible pollen tube pathway was 425 μm and pollen tubes first reached the ovule at 45 min after pollination. The mean adjusted pollen tube growth rate was 551 μm/h. Conclusions Ruppia pollen is adapted for rapid pollen germination, which is likely advantageous in an aquatic habitat. Small effective pollen loads suggest that pollen competition intensity is low. Selection for traits such as a long period of stigma receptivity, fast pollen germination, and carpel morphology likely played a larger role in shaping postpollination reproductive development in Ruppia than evolution in pollen tube growth rates.

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How does genome size affect the evolution of pollen tube growth rate, a haploid performance trait?

Cited by 2 publications

References 135 publications

Genome size variation and evolution during invasive range expansion in an introduced plant

Genome size variation and evolution during invasive range expansion in an introduced plant

Reproductive ecology and postpollination development in the hydrophilous monocot Ruppia maritima

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