Mother knows best: plant polyploidy affects feeding and oviposition preference of the alligator weed biological control agent, Agasicles hygrophila

Krug, Pamela; Sosa, Alejandro

doi:10.1007/s10526-019-09959-9

Cited by 11 publications

(16 citation statements)

References 49 publications

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“…Here, we found that O. strigicollis laid the most eggs at the tip of the KBPs, which indicated this location as their preferred oviposition site. The egg hatching rate is an important biological index used to measure host fitness or the suitability of oviposition substrates (Murai, Naraim & Sugiura, 2001;Bonte & De Clercq, 2011;Bonte & De Clercq, 2010;Krug & Sosa, 2019), and it is also the most intuitive criterion to judge (Castane & Zalom, 1994). Therefore, we further analyzed the hatching rates of eggs laid on different parts of the KBPs (tail vs. middle).…”

Section: Discussionmentioning

confidence: 99%

The predatory bug Orius strigicollis shows a preference for egg-laying sites based on plant topography

Huang

Ren

et al. 2021

PeerJ

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Background Oviposition site selection is an important factor in determining the success of insect populations. Orius spp. are widely used in the biological control of a wide range of soft-bodied insect pests such as thrips, aphids, and mites. Orius strigicollis (Heteroptera: Anthocoridae) is the dominant Orius species in southern China; however, what factor drives its selection of an oviposition site after mating currently remains unknown. Methods Here, kidney bean pods (KBPs) were chosen as the oviposition substrate, and choice and nonchoice experiments were conducted to determine the preferences concerning oviposition sites on the KBPs of O. strigicollis. The mechanism of oviposition behavior was revealed through observation and measurement of oviposition action, the egg hatching rate, and the oviposition time. Results We found that O. strigicollis preferred the seams of the pods for oviposition, especially the seams at the tips of the KBPs. Choice and nonchoice experiments showed that females did not lay eggs when the KBP tail parts were unavailable. The rates of egg hatching on different KBP parts were not significantly different, but the time required for females to lay eggs on the tip seam was significantly lower. Decreased oviposition time is achieved on the tip seam because the insect can exploit support points found there and gain leverage for insertion of the ovipositor. Discussion The preferences for oviposition sites of O. strigicollis are significantly influenced by the topography of the KBP surface. Revealing such behavior and mechanisms will provide an important scientific basis for the mass rearing of predatory bugs.

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Section: Discussionmentioning

confidence: 99%

The predatory bug Orius strigicollis shows a preference for egg-laying sites based on plant topography

Huang

Ren

et al. 2021

PeerJ

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“…These results suggest that genome size in this species can vary within a ploidy level. The presence of hexaploids in the United States and China may be an advantage for control with A. hygrophila (Krug and Sosa 2019). Whether genome size per se might also impact biological control agents or is related to invasiveness in this species is unknown and deserves further study.…”

Section: Leaf Morphology and Plant Architecturementioning

confidence: 98%

“…68) or hexaploid (6n = ca. 102), while in China, individuals are hexaploid (6n = 102) (Cai et al 2009;Krug and Sosa 2019;Sosa et al 2008). Based on estimates of genome size, A. philoxeroides may be pentaploid in the United States (Chen et al 2015).…”

Section: Introductionmentioning

confidence: 99%

“…The ploidy of A. philoxeroides may be important from a control standpoint, because increased ploidy has been suggested to contribute to invasiveness for a number of taxa by increasing adaptive potential or plasticity to environmental conditions and management actions (Pandit et al 2014;te Beest et al 2012). However, for A. philoxeroides, female alligator weed flea beetles (Agasicles hygrophila Selman and Vogt, Coleoptera: Chrysomelidae) prefer to oviposit, and larvae have better performance on hexaploids than tetraploids in the native range (Krug and Sosa 2019). Therefore, the role of polyploidy in A. philoxeroides invasion success and management remains unclear.…”

Section: Introductionmentioning

confidence: 99%

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High genetic diversity in the clonal aquatic weedAlternanthera philoxeroidesin the United States

Williams

Harms

Knight

et al. 2020

Invasive plant sci. manag.

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The distribution of genetic diversity in invasive plant populations can have important management implications. Alligator weed (Alternanthera philoxeroides (Mart.) Griseb.) was introduced into the United States around 1900 and has since spread throughout much of the southern U.S. and California. A successful biological control program was initiated in the late 1960s which reduced alligator weed in the southern U.S., although control has varied geographically. The degree to which variation among genotypes may be responsible for variation in control efficacy has not been well studied due to a lack of genetic data. We sampled 373 plants from 90 sites across the U.S. and genotyped all samples at three chloroplast regions to help inform future management efforts. Consistent with clonal spread, there was high differentiation between sites, yet we found six haplotypes and high haplotype diversity (mean h = 0.48) across states, suggesting this plant has been introduced multiple times. Two of the haplotypes correspond to previously described biotypes that differ in their susceptibility to herbicides and herbivory. The geographic distribution of the three common haplotypes varied by latitude and longitude while the other haplotypes were widespread or localized to one or a few sites. All the haplotypes we screened are hexaploid (6n = 102) which may enhance biological control. Future studies can use these genetic data to determine if genotypes differ in their invasiveness or respond differently to control measures. Some states for instance, have mainly a single haplotype and so may respond more uniformly to a single control strategy compared to other states which may require a variety of control strategies. These data will also provide the basis for identifying the source regions in South America, which may lead to the discovery of new biological control agents more closely matched to particular genotypes.

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“…Lastly, higher ploidy levels may increase the variation upon which selection can act to change pollination traits and thereby affect reproduction capacity. Phenotypic changes in polyploids, specifically with floral traits, could have impact on reproduction and establishment success (Rezende et al, 2020;Segraves and Anneberg, 2016), and the increase in seed and fruit size emanating from increased cell size due to duplicated genomes (the 'gigas effect'; Corneillie et al, 2019) Chrysomelidae), distinguished between the two ploidy levels of alligator weed, Alternanthera philoxeroides (Martius) Grisebach, and preferred to lay eggs on hexaploids rather than tetraploids (Krug and Sosa, 2019).…”

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confidence: 99%

Two ploidy levels present in the invasive Campuloclinium macrocephalum (pompom weed) in South Africa – Implications for biocontrol

et al. 2021

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Campuloclinium macrocephalum (Less.) DC. (Asteraceae) is a perennial herb native to Central and South America (Goodall, 2016). It was first reported in South Africa in the early 1960s and was likely introduced either as an ornamental or through contaminated hay (McConnachie et al., 2011). Genetic evidence suggests that the pompom invasion may have resulted from multiple introductions mainly through Gauteng province in South Africa, with long-distance dispersal playing a major role in its spread across the country (Gitonga

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Mother knows best: plant polyploidy affects feeding and oviposition preference of the alligator weed biological control agent, Agasicles hygrophila

Cited by 11 publications

References 49 publications

The predatory bug Orius strigicollis shows a preference for egg-laying sites based on plant topography

The predatory bug Orius strigicollis shows a preference for egg-laying sites based on plant topography

High genetic diversity in the clonal aquatic weedAlternanthera philoxeroidesin the United States

Two ploidy levels present in the invasive Campuloclinium macrocephalum (pompom weed) in South Africa – Implications for biocontrol

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