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AoB Plants

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https://www.readbyqxmd.com/read/28798864/temporal-variations-in-methane-emissions-from-emergent-aquatic-macrophytes-in-two-boreonemoral-lakes
#1
Per Milberg, Lina Törnqvist, Lars M Westerberg, David Bastviken
Methane (CH4) emissions via emergent aquatic macrophytes can contribute substantially to the global CH4 balance. We addressed temporal variability in CH4 flux by using the static chamber approach to quantify fluxes from plots dominated by two species considered to differ in flux transport mechanisms (Phragmites australis, Carex rostrata). Temporal variability in daily mean emissions from early June to early October was substantial. The variable that best explained this variation was air temperature. Regular and consistent diel changes were absent and therefore less relevant to include when estimating or modelling CH4 emissions...
July 2017: AoB Plants
https://www.readbyqxmd.com/read/28721188/trait-variation-along-elevation-gradients-in-a-dominant-woody-shrub-is-population-specific-and-driven-by-plasticity
#2
Alix A Pfennigwerth, Joseph K Bailey, Jennifer A Schweitzer
Elevation gradients are frequently used as space-for-time substitutions to infer species' trait responses to climate change. However, studies rarely investigate whether trait responses to elevation are widespread or population-specific within a species, and the relative genetic and plastic contributions to such trait responses may not be well understood. Here, we examine plant trait variation in the dominant woody shrub, Rhododendron maximum, along elevation gradients in three populations in the South Central Appalachian Mountains, USA, in both field and common garden environments...
July 2017: AoB Plants
https://www.readbyqxmd.com/read/28721187/individual-and-interactive-effects-of-white-tailed-deer-and-an-exotic-shrub-on-artificial-and-natural-regeneration-in-mixed-hardwood-forests
#3
Charlotte F Owings, Douglass F Jacobs, Joshua M Shields, Michael R Saunders, Michael A Jenkins
Underplanting tree seedlings in areas where natural regeneration is limited may offer a tool by which desired overstory composition can be maintained or restored in forests. However, invasive plant species and ungulate browsing may limit the effectiveness of underplanting, and in-turn, the successful restoration of forest ecosystems. Individually, the invasive shrub Lonicera maackii and browsing by white-tailed deer (Odocoileus virginianus) have been found to negatively affect the regeneration of native tree species in the Midwestern United States, but few studies have examined their interactive or cumulative effects...
July 2017: AoB Plants
https://www.readbyqxmd.com/read/28721186/factors-driving-the-global-decline-of-cycad-diversity
#4
Ledile T Mankga, Kowiyou Yessoufou
Mounting evidence indicates that we are witnessing the sixth mass extinction period. Given the important goods and services biodiversity delivers to humans, there is a need for a continued commitment to investigate what pre-disposes some taxa to greater risk of extinction. Here, we investigate this question using a phylogenetic comparative method and fitting a cumulative link mixed effect model on biological, ecological and evolutionary data of cycads, the most threatened lineage in the plant kingdom. We identified nine groups of threats to cycads, with habitat loss, over-collection, fire and reproduction failure being the most prominent, but only four of these threats (habitat loss, over-collection, medicinal uses and reproduction failure) clustered on the cycad tree of life...
July 2017: AoB Plants
https://www.readbyqxmd.com/read/28717440/stigmatic-limitations-on-reproductive-success-in-a-paleotropical-tree-causes-and-consequences
#5
Madhu Raina, Raman Kumar, Veenu Kaul
Success in reproduction is subject to the successful initiation as well as successful completion of a chain of consecutive events starting from flower formation and ending with viable seed production. A pivotal role in this chain is played by the stigma which is the seat of pollen recognition and initiation of pollen-pistil interaction. An interesting feature of the family Bignoniaceae is the presence of thigmosensitive stigmas which open, close and re-open in response to touch. Kigelia pinnata bears a touch sensitive stigma and is a low fruit setter in Jammu and Kashmir (India)...
July 2017: AoB Plants
https://www.readbyqxmd.com/read/28702163/slow-stamen-movement-in-a-perennial-herb-decreases-male-male-and-male-female-interference
#6
Lingyan Wang, Yu Bao, Hanxi Wang, Chunguang He, Ping Wang, Lianxi Sheng, Zhanhui Tang
Approximately 80 % of angiosperm species produce hermaphroditic flowers, which face the problem of male-male sexual interference (one or more anthers gets in the way of disseminating pollen from other anthers) or male-female sexual interference (the pistil interferes with disseminating pollen from the anthers by preventing the anther from touching a pollinator, or the anther prevents pollinator from depositing outcross pollen on the stigma). Slow stamen movement in hermaphrodite flowers has been interpreted as an adaptation for reducing male-male sexual interference...
July 2017: AoB Plants
https://www.readbyqxmd.com/read/28798863/pollination-success-following-loss-of-a-frequent-pollinator-the-role-of-compensatory-visitation-by-other-effective-pollinators
#7
Allysa C Hallett, Randall J Mitchell, Evan R Chamberlain, Jeffrey D Karron
Pollinator abundance is declining worldwide and may lower the quantity and quality of pollination services to flowering plant populations. Loss of an important pollinator is often assumed to reduce the amount of pollen received by stigmas of a focal species (pollination success), yet this assumption has rarely been tested experimentally. The magnitude of the effect, if any, may depend on the relative efficiency of the remaining pollinators, and on whether the loss of one pollinator leads to changes in visitation patterns by other pollinators...
May 2017: AoB Plants
https://www.readbyqxmd.com/read/28698790/sequential-stamen-maturation-and-movement-in-a-protandrous-herb-mechanisms-increasing-pollination-efficiency-and-reducing-sexual-interference
#8
Chang-Long Xiao, Hui Deng, Gan-Ju Xiang, Kadiori Edwin Luguba, You-Hao Guo, Chun-Feng Yang
Successive stamen movement directly controls pollen presentation schedules through sequential stamen maturation and changes the extent of herkogamy by altering the positions of sexual organs. However, the implications of such movements in terms of pollination are not well understood. Pollen presentation theory predicts that staggered pollen presentation should be favoured when plants are subject to diminishing returns on pollen transfer. Herkogamy on the other hand, has been interpreted as an adaptive trait that reduces sexual interference in hermaphrodite flowers...
May 2017: AoB Plants
https://www.readbyqxmd.com/read/28685014/breeding-system-and-pollination-of-two-closely-related-bamboo-species
#9
Ling-Na Chen, Yong-Zhong Cui, Khoon-Meng Wong, De-Zhu Li, Han-Qi Yang
An understanding of the breeding systems and pollination of agriculturally important plants is critical to germplasm improvement. Breeding system characteristics greatly influence the amount and spatial distribution of genetic variation within and amongst populations and influence the rarity and extinction vulnerability of plant species. Many woody bamboos have a long vegetative period (20-150 years) followed by gregarious monocarpy. Relatively, little is known about their pollination and breeding systems...
May 2017: AoB Plants
https://www.readbyqxmd.com/read/28567240/phylogeography-genetic-diversity-and-population-structure-in-a-patagonian-endemic-plant
#10
Alicia López, Marisa G Bonasora
Phylogeographical patterns provide valuable insight into the historical processes underlying diversification, and may provide a better understanding of biodiversity, dispersal modes, diversification times, extinctions, refuge areas and other species-/population-level processes. Here, we examine the genetic structure of Oxalis laciniata, a representative of Oxalis, which is an important emerging model in evolutionary biology and phylogenetic studies. We analyse genetic correlation, haplotype diversity and genetic structure...
May 2017: AoB Plants
https://www.readbyqxmd.com/read/28533899/genetic-diversity-and-structure-of-an-endangered-desert-shrub-and-the-implications-for-conservation
#11
Zhihao Su, Bryce A Richardson, Li Zhuo, Xiaolong Jiang, Wenjun Li, Xiaoshan Kang
Population genetic information can provide valuable insight for the conservation and management of threatened and endangered plant species. Tamarix taklamakanensis is an endangered shrub endemic to arid basins of northwestern China. This species serves to stabilize soils in this region, but has seen substantial loss in its abundance due to depletion of ground water. The populations of this species have become small and fragmented, warranting conservation. Seven microsatellite loci were used to assess the genetic diversity and structure of 15 populations in the Tarim Basin, China...
May 2017: AoB Plants
https://www.readbyqxmd.com/read/28533898/reconstructing-a-herbivore-s-diet-using-a-novel-rbcl-dna-mini-barcode-for-plants
#12
David L Erickson, Elizabeth Reed, Padmini Ramachandran, Norman A Bourg, William J McShea, Andrea Ottesen
Next Generation Sequencing and the application of metagenomic analyses can be used to answer questions about animal diet choice and study the consequences of selective foraging by herbivores. The quantification of herbivore diet choice with respect to native versus exotic plant species is particularly relevant given concerns of invasive species establishment and their effects on ecosystems. While increased abundance of white-tailed deer (Odocoileus virginianus) appears to correlate with increased incidence of invasive plant species, data supporting a causal link is scarce...
May 2017: AoB Plants
https://www.readbyqxmd.com/read/28533897/introduction-to-the-special-issue-tree-invasions-towards-a-better-understanding-of-their-complex-evolutionary-dynamics
#13
Heidi Hirsch, David M Richardson, Johannes J Le Roux
Many invasive plants show evidence of trait-based evolutionary change, but these remain largely unexplored for invasive trees. The increasing number of invasive trees and their tremendous impacts worldwide, however, illustrates the urgent need to bridge this knowledge gap to apply efficient management. Consequently, an interdisciplinary workshop, held in 2015 at Stellenbosch University in Stellenbosch, South Africa, brought together international researchers to discuss our understanding of evolutionary dynamics in invasive trees...
May 2017: AoB Plants
https://www.readbyqxmd.com/read/28533896/sex-specific-differences-in-functional-traits-and-resource-acquisition-in-five-cycad-species
#14
Christopher Krieg, James E Watkins, Sally Chambers, Chad E Husby
Selective pressures acting on plant life histories can drive extreme specialization. One example of such specialization is the evolution of dioecious breeding systems. Evolutionary and ecological theory posits that dioecy may subject male and female individuals to different selective pressures and result in unique sex-mediated adaptive traits related to resource allocation and ecophysiology. Cycads are the earliest diverging lineage of seed plants with strict dioecy, yet we know almost nothing about the ecology and physiology of this group...
March 2017: AoB Plants
https://www.readbyqxmd.com/read/28533895/effects-of-nitrogen-and-tiller-type-on-grain-yield-and-physiological-responses-in-rice
#15
Yang Wang, Jianwei Lu, Tao Ren, Saddam Hussain, Chen Guo, Sen Wang, Rihuan Cong, Xiaokun Li
The increasing food demands from an expanding population necessitate global efforts to increase crop production and ensure food security. The rate of nitrogen (N) fertilizer application is strongly related to crop yield. However, although the application of N fertilizer significantly increases the number of tillers in rice, late emerging tillers usually produce lower yields compared with early emerging tillers. Understanding the physiological constraints of late emerging rice tillers is critical for further increasing rice grain yields...
March 2017: AoB Plants
https://www.readbyqxmd.com/read/28496966/effects-of-deer-on-the-photosynthetic-performance-of-invasive-and-native-forest-herbs
#16
J Mason Heberling, Nathan L Brouwer, Susan Kalisz
Overabundant generalist herbivores can facilitate non-native plant invasions, presumably through direct and indirect modifications to the environment that affect plant performance. However, ecophysiological mechanisms behind ungulate-mediated plant invasions have not been well-studied. At a long-term Odocoileus virginianus (white-tailed deer) exclusion site in a temperate deciduous forest, we quantified deer-mediated ecophysiological impacts on an invasive biennial Alliaria petiolata (garlic mustard) and two palatable native herbaceous perennials, Maianthemum racemosum and Trillium grandiflorum...
March 2017: AoB Plants
https://www.readbyqxmd.com/read/28439396/antibiotics-impact-plant-traits-even-at-small-concentrations
#17
Vanessa Minden, Andrea Deloy, Anna Martina Volkert, Sara Diana Leonhardt, Gesine Pufal
Antibiotics of veterinary origin are released to agricultural fields via grazing animals or manure. Possible effects on human health through the consumption of antibiotic exposed crop plants have been intensively investigated. However, information is still lacking on the effects of antibiotics on plants themselves, particularly on non-crop species, although evidence suggests adverse effects of antibiotics on growth and performance of plants. This study evaluated the effects of three major antibiotics, penicillin, sulfadiazine and tetracycline, on the germination rates and post-germinative traits of four plant species during ontogenesis and at the time of full development...
March 2017: AoB Plants
https://www.readbyqxmd.com/read/28439395/antioxidant-responses-under-salinity-and-drought-in-three-closely-related-wild-monocots-with-different-ecological-optima
#18
Mohamad Al Hassan, Juliana Chaura, María P Donat-Torres, Monica Boscaiu, Oscar Vicente
Some deleterious effects of drought, soil salinity and other abiotic stresses are mediated by the generation of oxidative stress through an increase in reactive oxygen species (ROS) that damage cellular membranes, proteins and DNA. In response to increased ROS, plants activate an array of enzymatic and non-enzymatic antioxidant defences. We have correlated the activation of these responses with the contrasting tolerance to salinity and drought of three species of the genus Juncus, viz. J. maritimus, J. acutus (both halophytes) and J...
March 2017: AoB Plants
https://www.readbyqxmd.com/read/28439394/seasonal-variation-in-effects-of-herbivory-on-foliar-nitrogen-of-a-threatened-conifer
#19
Robert N Schaeffer, Nicole E Soltis, Jennifer L Martin, Aden L Brown, Sara Gómez, Evan L Preisser, Colin M Orians
Invasive herbivores can dramatically impact the nitrogen (N) economy of native hosts. In deciduous species, most N is stored in stem tissues, while in evergreen conifer species N is stored in needles, making them potentially more vulnerable to herbivory. In eastern forests of the USA, the long-lived, foundational conifer eastern hemlock (Tsuga canadensis) is under the threat of extirpation by the invasive hemlock woolly adelgid (HWA: Adelges tsugae). We assessed the impact of HWA infestation on the patterns of seasonal foliar N availability in hemlock planted in a deciduous forest understory...
March 2017: AoB Plants
https://www.readbyqxmd.com/read/28435656/white-tailed-deer-browse-on-an-invasive-shrub-with-extended-leaf-phenology-meets-assumptions-of-an-apparent-competition-hypothesis
#20
Kylie L Martinod, David L Gorchov
It has been hypothesized that invasive plant species with extended leaf phenology (ELP) elevate generalist herbivore populations, increasing herbivory on native plants (apparent competition). This hypothesis assumes that consumption of the invasive is associated with periods of ELP, the invasive is a major component of the herbivore's diet, and that it is more nutritious than native plants during periods of ELP. We tested these assumptions by estimating the proportion of the white-tailed deer diet comprised of Lonicera maackii, an invasive shrub with ELP, quantifying the seasonal pattern of deer browse on this invasive shrub, and comparing its nutritional quality to leafless woody stems...
March 2017: AoB Plants
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