Water influences how seed production responds to conspecific and heterospecific pollen

Recart, Wilnelia; Ottoson, Brittany; Campbell, Diane R.

doi:10.1002/ajb2.1273

Cited by 4 publications

(4 citation statements)

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“…In hand pollination treatments, the HP proportion is usually different from under natural conditions (Caruso & Alfaro, 2000 ; Celaya et al, 2015 ; Da Silva & Sargent, 2011 ; Lanuza et al, 2021 ; Moragues & Traveset, 2005 ), which may artificially inflate fitness effects relative to natural conditions. Nevertheless, we were able to detect deleterious effects of HP even under natural conditions with most flowers receiving small proportions of HP, similar to previous reports that relatively low proportions of heterospecific pollen are associated with reduced seed production under some environmental conditions (Bruckman & Campbell, 2016 ; Recart et al, 2019 ). Moreover, a mixture of species contributed HP to S .…”

Section: Discussionsupporting

confidence: 90%

Spatial variation of pollen receipt and effects of heterospecific pollen on seed set in Salvia przewalskii

Fang

Zhang

Montgomery

2023

Ecology and Evolution

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Generalized pollinators visit multiple co‐flowering plant species and may transfer heterospecific pollen grains. Recent studies have indicated that the effect of heterospecific pollen (HP) on reproduction success is variable and depends on the identity of donor and recipient species. However, few studies have documented variation in HP receipt and evaluated the reproductive effects of HP receipt across geographic locations under natural conditions. We investigated the spatial variation of pollen deposition across eight sites and how the pollen receipt related to the seed set of Salvia przewalskii , a subalpine perennial herb in Hengduan Mountain in southwest China. We found that stigmatic pollen loads substantially varied among sites for several metrics, including quantities of conspecific and heterospecific pollen, the proportion of HP, and species composition of HP donors. Five different plant families were the most common HP source at one or two sites, and the proportion of HP ranged from 3.4% to 51.3% across sites. The association of conspecific pollen with seed set was positive and variable among sites, whereas the association of HP receipt and seed set was negative and not significantly different among sites. Our results demonstrate variation in the quantity and fitness effect of pollen receipt across sites, which is a precondition for evolution of local adaptation. Further study of variation in patterns and effects of HP receipt for the same recipient species across natural communities would allow better understanding of the ecological and evolutionary consequences of HP receipt.

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Section: Discussionsupporting

confidence: 90%

Spatial variation of pollen receipt and effects of heterospecific pollen on seed set in Salvia przewalskii

Fang

Zhang

Montgomery

2023

Ecology and Evolution

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“…For example, deposition of low-quality pollen could decrease the b1 slope, since additional low-quality pollen may not lead to the same increase in seed production as additional deposition of high-quality pollen. In natural populations of P. parryi , it is possible that the initial slope of seeds on pollen would also vary with water availability, because water supplied to donors is known to influence seed production in this species, likely through variation in pollen quality ( Recart et al 2019 ).…”

Section: Discussionmentioning

confidence: 99%

“…Fertilized water contained a mix with 95 % of Peters Professional 20-20-20 complete water-soluble fertilizer and 5 % of Best Ammonium Sulfate 21-0-0 at a concentration of 350–400 ppm in water. The low-water treatment simulated average February precipitation from 1906 to 2014 for Santa Ana, CA, and the high-water treatment simulated twice the average precipitation value ( Recart et al 2019 ). Thirty P. parryi individuals—randomly chosen from the germinated bulk seeds—were used as recipient plants, with 15 exposed to a low-water treatment and the other 15 exposed to a high-water treatment.…”

Section: Methodsmentioning

confidence: 99%

Water availability affects the relationship between pollen intensity and seed production

Recart

Campbell

2021

AoB PLANTS

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Background and Aims Seed production can be affected by water availability and also depend on the amount (pollen intensity) and quality of pollen deposited. The way pollen receipt on the stigma translates into seeds produced follows that of a saturating dose-response. Not only can water availability and pollen intensity each influence seed production, these factors could interact in their effects on seed production. Changes to the relationship between seed production and pollen intensity can in turn influence pollinator effectiveness and pollinator-mediated selection. We asked how water availability affected indices of plant fitness (seed set, fruit set, and seed mass) and the relationship between pollen intensity and seed production in Phacelia parryi. Methods We conducted a greenhouse experiment where we manipulated water availability (either high- or low-water) to pollen recipient plants and hand-pollinated each plant with a range of pollen intensities. We conducted 703 hand-pollinations on 30 plants. For each hand-pollinated flower we measured pollen deposited, seed production and seed mass. We then generated a piecewise regression of the relationship between pollen intensity and seed production, and determined average effects of water on plant fitness measures. This experiment was paired with a field observational study aimed to document natural variation in pollen deposition. Key Results Average seed production per fruit was 21% higher in the high-watered plants. The relationship between pollen intensity and seed production differed between the two water treatments. Plants under high-water exhibited a wider range in which pollen deposition increased seed production. Average natural pollen intensities fell within different regions of the piecewise regression for low- and high-water plants. Conclusions Water availability can alter the efficiency by which pollen received is translated into seeds produced. Our greenhouse data suggest that only under certain pollen intensity environments will water availability affect how pollen received is translated into seeds produced.

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“…It is also possible that pollen quality or quantity was different across the 2 years. For example, in Phacelia parryi, variation in water availability to conspecific pollen donors influenced seed production, presumably by affecting pollen quality (Recart et al 2019). Differences in pollen production across years have been suggested to explain differences in the relationship between pollinator visitation and seed production for Ipomopsis aggregata, a common species at our field sites (Waser and Price 2016).…”

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confidence: 91%

Unraveling the ecological and evolutionary impacts of a plant invader on the pollination of a native plant

Recart

Campbell

2021

Biol Invasions

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Interactions between a native plant species 8 and its pollinators, herbivores, or microbiome can be 9 affected by the presence of non-native plant species. 10 Non-native plant species are altering plant-pollinator 11 interactions, yet we know little about how these non-12 native species influence natural selection. In addition, 13 year-to-year variation in flowering could influence the 14 impacts of non-native species on reproductive success 15 in native plants and the strength and direction of 16 pollinator-mediated selection. We examined whether 17 the presence of the highly invasive plant Linaria 18 vulgaris influenced average pollinator visitation, 19 species composition of floral visitors, or pollinator-20 mediated selection in the native Penstemon strictus.In 21 the field, we conducted small scale L. vulgaris 22 inflorescence removals, that were repeated through 3 years. Pollinator-mediated selection on the floral trait of platform length was examined by determining the relationships between platform length and visitation, between visitation and seed production, and by calculating net selection based on seed production. We found that the presence of L. vulgaris on a small spatial scale facilitated pollinator visitation rates to P. strictus but did not influence pollinator-mediated selection on platform length. Pollinator visitation varied across years, as did the relationship between seed production and pollinator visitation, and the relationship between pollinator visitation and platform length. Although components of selection varied across years, no net selection on platform length was detected in any of the 3 years. Our results show how the presence of an invasive plant and year-to-year variation in plant-pollinator interactions affect the pollination and components of pollinator-mediated selection in native plants.

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Water influences how seed production responds to conspecific and heterospecific pollen

Cited by 4 publications

References 49 publications

Spatial variation of pollen receipt and effects of heterospecific pollen on seed set in Salvia przewalskii

Spatial variation of pollen receipt and effects of heterospecific pollen on seed set in Salvia przewalskii

Water availability affects the relationship between pollen intensity and seed production

Unraveling the ecological and evolutionary impacts of a plant invader on the pollination of a native plant

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