STUDIES ON THE ARTHROPOD FAUNA OF ALFALFA: IV. SPECIES ASSOCIATED WITH THE CROWN

1973 ◽  
Vol 105 (3) ◽  
pp. 353-366 ◽  
Author(s):  
A. G. Wheeler
Keyword(s):  
Relative Abundance ◽  
Plant Tissue ◽  
Arthropod Community ◽  
Living Plant ◽  
Alfalfa Plant ◽  
Arthropod Species ◽  
Arthropod Fauna ◽  
Feeding Activities ◽  
Chance Occurrence ◽  
The Relationship

AbstractThe arthropod fauna associated with deteriorating crowns of alfalfa, Medicago sativa L., was studied at Ithaca, N.Y., during 1968–1969. Four decompositional stages of crowns were delimited, ranging from those of healthy, 1-year-old plants to those of dead plants. A total of 77 arthropod species, including 44 species of Diptera, were reared from the four stages of crowns. Information given for each species includes relative abundance, and associated stage of crown and number of crowns. Adults of several reared species had been collected from alfalfa foliage samples in previous years of study and were species for which the relationship to alfalfa had been obscure and which might in most insect–plant studies have been dismissed as being of chance occurrence or accidental on the plants. However, species breeding within the crowns contributed to the richness of the alfalfa fauna. Because species breeding within the microhabitat of decaying crowns were only rarely found to be associated with other morphological parts of the alfalfa plant, the crown community can be considered as a “centre of action” within the total alfalfa–arthropod community. The possible importance of considering species comprising the crown community in studies on communal stability is discussed.None of the species of the crown community were shown to be definite primary invaders in crowns of healthy plants, although several reared species have been reported to damage living plant tissue. Many of the species probably were feeding on microorganisms and partitioning the available food resources by feeding preferentially on different classes of microorganisms. The majority of species should be classed as secondary invaders. While mechanical and winter injury probably were the main causes of initial damage to the crowns, feeding activities of the secondary-invading arthropods may have accelerated the process of crown deterioration and further opened tissues of the crown to penetration by pathogens.

Effectors of biotrophic fungal plant pathogens

2010 ◽  
Vol 37 (10) ◽  
pp. 913 ◽  
Author(s):  
Pamela H. P. Gan ◽  
Maryam Rafiqi ◽  
Adrienne R. Hardham ◽  
Peter N. Dodds
Keyword(s):  
Plant Tissue ◽  
Fungal Pathogen ◽  
Plant Pathogens ◽  
Plant Cells ◽  
Host Cells ◽  
Plant Proteins ◽  
Living Plant ◽  
Host Cytoplasm ◽  
Fungal Plant Pathogens ◽  
Biotrophic Fungi

Plant pathogenic biotrophic fungi are able to grow within living plant tissue due to the action of secreted pathogen proteins known as effectors that alter the response of plant cells to pathogens. The discovery and identification of these proteins has greatly expanded with the sequencing and annotation of fungal pathogen genomes. Studies to characterise effector function have revealed that a subset of these secreted pathogen proteins interact with plant proteins within the host cytoplasm. This review focuses on the effectors of intracellular biotrophic and hemibiotrophic fungal plant pathogens and summarises advances in understanding the roles of these proteins in disease and in elucidating the mechanism of fungal effector uptake into host cells.

scholarly journals Community structure of arboreal and soil-dwelling arthropods in three different rice planting indexes in freshwater swamps of South Sumatra, Indonesia

2020 ◽  
Vol 21 (10) ◽  
Author(s):  
Tili Karenina ◽  
Siti Herlinda ◽  
Chandra Irsan ◽  
Yulia Pujiastuti ◽  
Hasbi Hasbi ◽  
...  
Keyword(s):  
Community Structure ◽  
Species Diversity ◽  
Rice Fields ◽  
Herbivorous Insects ◽  
Arthropod Community ◽  
Pitfall Traps ◽  
Sogatella Furcifera ◽  
Pardosa Pseudoannulata ◽  
Arthropod Species ◽  
Predatory Arthropods

Abstract. Karenina T, Herlinda S,  Irsan C, Pujiastuti Y, Hasbi, Suparman, Lakitan B, Hamidson H, Umayah A. 2020. Community structure of arboreal and soil-dwelling arthropods in three different rice planting indexes in freshwater swamps of South Sumatra, Indonesia. Biodiversitas 21: 4839-4849.  Differences in the index of rice planting can cause differences in the structure of the arthropod community. This study aimed to characterize the community structure of the arboreal and soil-dwelling arthropods in the three different rice planting indexes (PI) in the freshwater swamps of South Sumatra.  Sampling of the arthropods using D-vac and pitfall traps was conducted in the three different rice planting, namely one (PI-100), two (PI-200), and three (PI-300) planting indexes of the rice. The results of the study showed that the dominant predatory arthropod species in the rice fields were Pardosa pseudoannulata, Tetragnatha javana, Tetragnatha virescens, Pheropsophus occipitalis, Paederus fuscipes, and the dominant herbivorous insects were Leptocorisa acuta, Nilavarpata lugens, and Sogatella furcifera. The abundance of arboreal predatory arthropods was the highest in the PI-300 rice and the lowest in the PI-100 rice.    The abundance of soil-dwelling arthropods was the highest in the rice PI-100, and low in the rice PI-200 and PI-300, but the rice PI-100 had the highest abundance of the herbivorous insects. The rice PI-300 was the most ideal habitats to maintain the abundance and the species diversity of the arboreal predatory arthropods. Thus, the rice cultivation throughout the year was profitable in conserving and maintaining the abundance and species diversity of the predatory arthropods.

scholarly journals Real-time Assay of Toxic Lead in In Vivo Living Plant Tissue

2013 ◽  
Vol 29 (4) ◽  
pp. 293-298
Author(s):  
SuwYoung Ly ◽  
Nack Joo Kim ◽  
Minsang Youn ◽  
Yongwook Kim ◽  
Yeolmin Sung ◽  
...  
Keyword(s):  
Real Time ◽  
Plant Tissue ◽  
Living Plant

STUDIES ON THE ARTHROPOD FAUNA OF ALFALFA: II. ARTHROPOD–FUNGUS ASSOCIATIONS

1972 ◽  
Vol 104 (9) ◽  
pp. 1405-1412
Author(s):  
A. G. Wheeler
Keyword(s):  
Seasonal Changes ◽  
Immature Stages ◽  
Arthropod Species ◽  
Late Fall ◽  
Medicago Saliva ◽  
Arthropod Fauna

AbstractObservations were made during 1967 to 1969 at Ithaca, N.Y., supplemented by collections at New Cumberland and Carlisle, Pa., on arthropods associated with fungi occurring on alfalfa, Medicago saliva L. Five species of Coleoptera, two species of Diptera, one species each of Collembola and Psocoptera, and nine species of Acari were reared or collected consistently from fungus-covered alfalfa leaves, stems, and seed pods. Attraction to fungi on the plants, principally Alternaria sp., accounted for the presence on alfalfa of arthropod species that normally might be considered as accidentals or visitors. The mycetophagous species thus contributed to the richness of the alfalfa fauna. Immature stages of several species were collected only in late fall or on 3- or 4-year-old plants. The possible role of the fungus-feeding species in seasonal changes in the alfalfa fauna and changes in the fauna in successive years is discussed.

Does habitat or depth influence catch rates of pelagic species?

2007 ◽  
Vol 64 (11) ◽  
pp. 1581-1594 ◽  
Author(s):  
Keith A Bigelow ◽  
Mark N Maunder
Keyword(s):  
Relative Abundance ◽  
Environmental Conditions ◽  
Environmental Data ◽  
Catch Per Unit Effort ◽  
Blue Shark ◽  
Species Vulnerability ◽  
Thunnus Obesus ◽  
Catch Rates ◽  
The Relationship ◽  
The Vertical Distribution

The efficiency of a pelagic longline fishing operation and the species composition of the resulting catch is influenced primarily by the relationship between the distribution of hooks and species vulnerability, with vulnerability described by either depth or some suite of environmental variables. We therefore fitted longline catch rate models to determine whether catch is estimated better by vertically distributing a species by depth or by environmental conditions (e.g., temperature, thermocline gradient, and oxygen concentration). Catch rates were estimated by two methods: (i) monitoring longlines where the vertical distribution of hooks and catch in relation to depth and environmental conditions is known, and (ii) applying a statistical habitat-based standardization (statHBS) model to fishery and environmental data to develop relative abundance indices for bigeye tuna (Thunnus obesus) and blue shark (Prionace glauca). Results indicated that an understanding of gear dynamics and environmental influences are important for analyzing catch-per-unit-effort (CPUE) data correctly. Analyses based on depth-specific catch rates can lead to serious misinterpretation of abundance trends, despite the use of sophisticated statistical techniques (e.g., generalized linear mixed models). This illustrates that inappropriate inclusion or exclusion of important covariates can bias estimates of relative abundance, which may be a common occurrence in CPUE analysis.

EVALUATION OF THE FOREST FLORA POPULATION

1932 ◽  
Vol 64 (12) ◽  
pp. 265-267
Author(s):  
Arthur Paul Jacot
Keyword(s):  
Plant Tissue ◽  
Forest Floor ◽  
Mineral Matter ◽  
Living Plant ◽  
Forest Flora ◽  
Quantitative Studies

In all the quantitative studies of the forest floor, sod, and soil faunas, the Acarina or mites have been grouped under one head as useful in reducing dead leaves and twigs to crude mineral matter, in spite of the fact that it is well known that some of the floor Acarina are eaters of mildews and moulds (minute fungi), some are predaceous, and some feed on living plant tissue.

scholarly journals Unidirectional Steady State Rates of Central Metabolism Enzymes Measured Simultaneously in a Living Plant Tissue

1998 ◽  
Vol 273 (39) ◽  
pp. 25053-25061 ◽  
Author(s):  
Albrecht Roscher ◽  
Lyndon Emsley ◽  
Philippe Raymond ◽  
Claude Roby
Keyword(s):  
Steady State ◽  
Plant Tissue ◽  
Central Metabolism ◽  
Living Plant ◽  
Metabolism Enzymes

scholarly journals Effect of intestinal flora on the formation of endometritis of sow

2020 ◽  
Author(s):  
Ling Zhang ◽  
Linkang Wang ◽  
Yimin Dai ◽  
Tianyu Tao ◽  
Jingqi Wang ◽  
...  
Keyword(s):  
Relative Abundance ◽  
Intestinal Flora ◽  
Intestinal Bacteria ◽  
Experimental Result ◽  
Intestinal Microbes ◽  
Birth Canal ◽  
Significant Difference ◽  
Vaginal Secretions ◽  
Fresh Feces ◽  
The Relationship

Abstract Background Aberration of birth canal microbiota is one of the most important factors in the etiology of sow endomentritis. Nevertheless, reports about the structure and composition of birth canal microbiota in endomentritis sow and their relationship with intestinal microbes is limited. Therefore, understanding the relationship between birth canal microbiota and intestinal microbiota of the host has become exceedingly crucial. Results In this study, 4 healthy and 4 endomentritis sows were selected basing on whether the sow had endometritis or not in a farm of China. The microflora of their birth canal secretions and fresh feces were analyzed via sequencing the V3 + V4 region of bacterial 16S rDNA gene. The results showed that the significant difference between endometritis and healthy sows birth canal flora in the composition and abundance. Sow endomentritis was associated with increasing in the relative abundance of Porphyromonas, Clostridium_sensu_stricto_1, Streptococcus, Ezakiella, Fusobacterium, Actinobacillus, Bacteroides, and Prevotella as well as Anaerococcus. On the contrary, the majority of beneficial bacteria that belonging to Firmicutes phylum (e.g., Lactobacillus and Enterococcus ) declined in endomentritis sow. The increased relative abundance of Porphyromonas in the vaginal secretions might correlate with the decrease of Lactobacillusin the feces of endometritis sows. Moreover, the experimental result also found that some intestinal bacteria (such as Escherichia-Shigella and Bacteroides) may be bound up with the onset of sow endometritis. Conclusion Sow endometritis is closely related to the microbiota of birth canal, and that some intestinal bacteria may promote the onset of endometritis. The above results can supply a theoretical basis to research the pathogenesis of endometritis and the microbiota of sow's birth canal and gut.

scholarly journals Dysbiosis of gut microbiota and its correlation with dysregulation of cytokines in psoriasis patients

2021 ◽  
Author(s):  
Xinyue Zhang ◽  
Kun Guo ◽  
Linjing Shi ◽  
Ting Sun ◽  
Songmei Geng
Keyword(s):  
Gut Microbiota ◽  
Relative Abundance ◽  
Gut Microbiome ◽  
High Throughput Sequencing ◽  
Interleukin 2 ◽  
Negative Relationship ◽  
Healthy Individuals ◽  
Microbial Composition ◽  
Microbiome Composition ◽  
The Relationship

Abstract Background: Psoriasis is an inflammatory skin disease associated with multiple comorbidities and substantially diminishes patients’ quality of life. The gut microbiome has become a hot topic in psoriasis as it has been shown to affect both allergy and autoimmunity diseases in recent studies. Our objective was to identify differences in the fecal microbial composition of patients with psoriasis compared with healthy individuals to unravel the microbiota profiling in this autoimmune disease.Results: We collected fecal samples from 30 psoriasis patients and 30 healthy controls, sequenced them by 16S rRNA high-throughput sequencing, and identified the gut microbial composition using bioinformatic analyses including Quantitative Insights into Microbial Ecology (QIIME) and Phylogenetic Investigation of Communities by Reconstruction of Unobserved States (PICRUSt). Our results showed that different relative abundance of certain bacterial taxa between psoriasis patients and healthy individuals, including Faecalibacterium and Megamonas, were increased in patients with psoriasis. It’s also implicated that many cytokines act as main effect molecules in the pathology of psoriasis. We selected the inflammation-related indicators that were abnormal in psoriasis patients and found the microbiome variations were associated with the level of them, especially interleukin-2 receptor showed a positive relationship with Phascolarctobacterium and a negative relationship with the dialister. The relative abundance of Phascolarctobacterium and dialister can be regard as predictors of psoriasis activity. The correlation analysis based on microbiota and Inflammation-related indicators showed that microbiota dysbiosis might induce an abnormal immune response in psoriasis. Conclusions: We concluded that the gut microbiome composition in psoriasis patients has been altered markedly and provides evidence to understand the relationship between gut microbiota and psoriasis. More mechanistic experiments are needed to determine whether the differences observed in gut microbiota are the cause or consequences of psoriasis and whether the relationship between gut microbiota and cytokines was involved.

scholarly journals Yellow Sap Contamination on Mangosteen (Garcinia mangostana L.) Fruit in Relation to Soil Calcium Contents and Plant Tissue

2021 ◽  
pp. 1-10
Author(s):  
. Martias ◽  
Titin Purnama ◽  
. Riska ◽  
. Affandi ◽  
Sri Yuliati ◽  
...  
Keyword(s):  
Plant Tissue ◽  
Sampling Method ◽  
Soil Samples ◽  
Site Location ◽  
Garcinia Mangostana ◽  
Fruit Flesh ◽  
Soil Calcium ◽  
West Sumatra ◽  
The Relationship ◽  
Leaf Part

Yellow sap contamination (YSC) is one of the mangosteen quality constrain in Indonesia. Calcium is the prominent nutrient that influence the incidence of yellow sap contamination. A research with objective to observe the relationship between incidence YSC and Ca availability in soil as well as plant tissue was done in ten locations in West Sumatra, Lampung and West Java provinces. Purposive random sampling method was used to determine the site locations. The plant and soil samples were collected from 10 sites and ten tree per sites. Correlation analysis was used to measure the relationship between incidence YSC and Ca content in fruit endocarp, mesocarp, peel, soil and leaf. The result showed that there was a variation of incidence YSC in site location with range of 8.7%−54.04%; 4.0−51.6%; and 17.7−78.6% for percentage of YSC in fruit flesh, segmentation and peel, respectively. Ca content in soil, endocarp, mesocarp and leaf were given significantly negative correlation toward incidence YSC in fruit flesh and segmentation. Ca content in leaf part correlates significantly to Ca availability in soil, endocarp and mesocarp. Ca content in leaf in the range of 1.40- 1.70% indicates YSC less than 10%.

Sign in / Sign up

Export Citation Format

Share Document