scholarly journals Environmental Impact On Morphological and Anatomical Structure of Ricinus communis L. Leaves Growing in Kathmandu, Nepal

2019 ◽  
Vol 7 (2) ◽  
pp. 274-278
Author(s):  
Belai Meeta Singh Suwal ◽  
Ratna Silwal Gautam ◽  
Dikshya Manandhar
Keyword(s):  
Climatic Factors ◽  
Ricinus Communis ◽  
Dry Mass ◽  
Anatomical Features ◽  
Ricinus Communis L ◽  
Leaf Dry Mass ◽  
Polluted Sites ◽  
Study Sites ◽  
The Comparative Study ◽  
The Impact

The current study was done to examine the impact of environmental pollution on morphology and anatomy of leaf of Ricinus communis L. of Kathmandu. The comparative study was done between the plants of high polluted sites i.e Ringroad sides and less polluted sites i.e Raniban forest of Kathmandu. The plants from both sites showed visible morphological and anatomical changes in leaves. These both study sites were found with similar soil factors and climatic factors. Reductions in some morphological and anatomical features were observed in leaves growing in highly polluted site. Reduction in leaf area, petiole length, thickness of palisade layer and thickness of spongy parenchyma was noticed in the leaves from highly polluted sites of Kathmandu. Other morphological and anatomical features such as leaf dry mass content, stomata frequency, thickness of cuticle and size of epidermal cells were noticed to be increased in leaves from highly polluted sites. Int. J. Appl. Sci. Biotechnol. Vol 7(2): 274-278  

scholarly journals Pruning from spheroidal to cubic canopy induced aphid outbreak by altering the plant performance in Box tree

2020 ◽  
Author(s):  
Anqun Chen ◽  
Yinzhan Liu ◽  
Xiaolin Liu ◽  
Juan Xuan ◽  
Chunlian Qiao ◽  
...  
Keyword(s):  
Structural Equation ◽  
Field Experiments ◽  
Plant Morphology ◽  
Dry Mass ◽  
Plant Performance ◽  
Plant Interactions ◽  
Mass Content ◽  
Leaf Dry Mass ◽  
The Impact ◽  
Aphid Abundance

Abstract Backgrounds: Plant-animal interactions comprise the fundamental relationships of ecological research, and are sensitive to environmental change. However, The effects of pruning on animal-plant interactions have rarely been studied. Methods: We conducted field experiments to examine the impact of artificially-pruned shapes (e.g. cubic and spheroidal canopy) on the performance of the Box tree and the resulting aphid abundance at three sites; on a university campus, at a road green belt, and in a residential area. The differences of aphid abundance and plant morphology were determined with ANOVAs and paired-sample tests. Relationships between the investigated parameters were detected with simple regression and structural equation modelResult: Abundance was higher in plants with a cubic canopy than with a spheroidal canopy. Plants with a cubic canopy had lower leaf dry mass content and inflorescence numbers, but greater fresh twig length than the plants with a spheroidal canopy. The aphid abundance was negatively correlated with the leaf dry mass content and inflorescence numbers, and positively correlated with the fresh twig length. Conclusion: Our findings have proven that pruning shape can significantly affect the abundance of herbivores on the pruned plants. The results can provide data support for human actives can alter plant performance, and thereby to change insect preference.

scholarly journals Plant growth and phytoactive alkaloid synthesis in Mitragyna speciosa (kratom) in response to varying radiance

2021 ◽  
Author(s):  
MENGZI ZHANG ◽  
Abhisheak Sharma ◽  
Francisco León ◽  
Bonnie Avery ◽  
Roger Kjelgren ◽  
...  
Keyword(s):  
Plant Growth ◽  
Plant Biomass ◽  
Dry Mass ◽  
Plant Production ◽  
Production Environment ◽  
Alternative Source ◽  
Lighting Conditions ◽  
Total Leaf ◽  
Leaf Dry Mass ◽  
The Impact

The dose-dependent consumptive effect of kratom and its potential application as an alternative source of medicine to mitigate opioid withdrawal symptoms has brought considerable attention to this plant. Increased interest in the application and use of kratom has emerged globally, including North America. Although the chemistry and pharmacology of major kratom alkaloids, mitragynine and 7-hydroxymitragynine, are well documented, foundational information on the impact of plant production environment on growth and kratom alkaloids synthesis is unavailable. To directly address this need, kratom plant growth, leaf chlorophyll content, and alkaloid concentration were evaluated under three lighting conditions: outdoor full sun, greenhouse unshaded, and greenhouse shaded. Nine kratom alkaloids were quantified using an ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) method. Contents of six alkaloids to include: mitragynine, speciogynine, speciociliatine, mitraphylline, coynantheidine, and isocorynantheidine were not significantly impacted by lighting conditions, whereas 7-hydroxymitragynine was below the lower limit of quantification across all treatments. However, paynantheine concentration per leaf dry mass was increased by 40% and corynoxine was increased by 111% when grown under shade conditions in a greenhouse compared to outdoor full sun. Additionally, total alkaloid yield per plant was maximized when plants were under such conditions. Greenhouse cultivation generally promoted height and width extension, leaf number, leaf area, average leaf size, and total leaf dry mass, compared to outdoor full sun condition. Rapid, non-destructive chlorophyll evaluation correlated well (r2 = 0.68) with extracted chlorophyll concentrations. Given these findings, production efforts where low-light conditions can be implemented are likely to maximize plant biomass and total leaf alkaloid production.

scholarly journals FATORES ABIÓTICOS E A DISTRIBUIÇÃO DE FOTOASSIMILADOS DA MAMONEIRA EM CONDIÇÕES SEMIÁRIDAS

Irriga ◽  
2018 ◽  
Vol 23 (1) ◽  
pp. 121-132
Author(s):  
Allan Nunes Alves ◽  
Hans Raj Gheyi ◽  
José Amilton Santos Júnior ◽  
Frederico Antônio Loureiro Soares ◽  
Claudio Augusto Uyeda ◽  
...  
Keyword(s):  
Castor Bean ◽  
Aerial Part ◽  
Management Practices ◽  
Saline Water ◽  
Ricinus Communis ◽  
Abiotic Factors ◽  
Dry Mass ◽  
Terra Preta ◽  
Ricinus Communis L ◽  
Bean Plants

FATORES ABIÓTICOS E A DISTRIBUIÇÃO DE FOTOASSIMILADOS DA MAMONEIRA EM CONDIÇÕES SEMIÁRIDAS1     ALLAN NUNES ALVES2; HANS RAJ GHEYI3; JOSÉ AMILTON SANTOS JÚNIOR4; FREDERICO ANTÔNIO LOUREIRO SOARES5; CLAUDIO AUGUSTO UYEDA6 E JOSÉ EUSTÁQUIO CAMPOS JÚNIOR4   1Artigo extraído da Tese de Doutorado do primeiro autor, presentada ao programa de Pós-Graduação em Engenharia Agrícola da UFCG 2Universidade Federal de Campina Grande. R. Aprígio Veloso, 882 - Universitário, Campina Grande - PB, 58429-900. [email protected] 3Universidade Federal do Recôncavo da Bahia. Cruz das Almas - BA, 44380-000. [email protected] 4Universidade Federal Rural de Pernambuco. R. Manuel de Medeiros, s/n - Dois Irmãos, Recife - PE, 52171-900 [email protected]; [email protected] 5Instituto Federal Goiano. Rodovia Sul Goiana, Km 01, Zona Rural, Rio Verde – GO, 75.901-970 [email protected] 6Instituto Federal de Pernambuco, Vitória de Santo Antão. Propriedade Terra Preta Zona Rural, s/n, Vitória de Santo Antão - PE, 55600-000 [email protected]     1 RESUMO   Embora a susceptibilidade a fatores abióticos seja evidente, a análise dos fotoassimilados em plantas sob estresse é relevante para subsidiar práticas de manejo. Nesta direção, buscou-se avaliar a produção da biomassa e analisar a distribuição de fotoassimilados da mamoneira (BRS Energia) irrigada com águas salinas (CEa = 0,6; 1,6; 2,6; 3,6; e 4,6 dS m-1) e adubada com doses de nitrogênio (50; 75; 100, 125 a 150 mg kg-1 de solo). Os fatores testados foram alocados em blocos casualizados, em esquema fatorial 5x5, com três repetições, totalizando 75 unidades experimentais. Os dados obtidos foram submetidos à análise da variância pelo teste ‘F’ e comparados mediante análise de regressão em 0,01 nível de probabilidade. Verificou-se que até CEa = 3,6 dS m-1 houve maior produção de massa seca da parte aérea sob 125 mg de N kg-1 de solo e que nas condições de salinidade impostas às plantas, as folhas foram a maior fonte e o racemo o maior dreno da parte aérea, bem como a alocação de fotoassimilados na raiz foi até 59,75% maior que na parte aérea.   Palavras-chave: Ricinus communis L., salinidade, adubação nitrogenada     ALVES, A. N.; GHEYI,H. R.; SANTOS JÚNIOR, J. A.; SOARES, F. A. L.; UYEDA, C. A; CAMPOS JÚNIOR, J. E. ABIOTIC FACTORS AND DISTRIBUTION OF PHOTOASSIMILATES IN CASTOR BEAN PLANTS UNDER SEMIARID CONDITIONS       2 ABSTRACT   Although the susceptibility to abiotic factors is obvious, the analysis of photoassimilates in plants under stress is relevant to subsidize management practices. In this context, the production of biomass and partition of photoassimilates of castor bean (BRS Energy) irrigated with saline water (ECw = 0.6, 1.6, 2.6, 3.6, and 4.6 dS m -1) and fertilized with nitrogen (50; 75; 100, 125 to 150 mg kg-1 of soil) was evaluated. The factors tested were allocated in randomized blocks in a 5x5 factorial design with three replications, totaling 75 experimental units, and the data were submitted to analysis of variance by the ‘F’ test and compared by regression analysis at 0.01 level of probability. It was verified that up to ECw = 3.6 dS m-1 there was greater dry mass production of shoot under 125 mg of N kg-1 of soil. In the conditions of salinity imposed to the plants, leaves were the greater source and racemus was the greater drainage of the aerial part, as well as the allocation of photoassimilates in the root was up to 59.75% higher than in the aerial part.   Keywords: Ricinus communis L., salinity, nitrogen fertilization

scholarly journals Pruning from spheroidal to cubic canopy induced aphid outbreak by altering the plant performance in spindle tree

2019 ◽  
Author(s):  
Yinzhan Liu ◽  
Juan Xuan ◽  
Anqun Chen ◽  
Chunlian Qiao ◽  
Renhui Miao ◽  
...  
Keyword(s):  
Field Experiments ◽  
Dry Mass ◽  
Residential Area ◽  
Plant Performance ◽  
University Campus ◽  
Plant Interactions ◽  
Mass Content ◽  
Leaf Dry Mass ◽  
The Impact ◽  
Aphid Abundance

Abstract The effects of pruning on animal-plant interactions have rarely been studied. We thus conducted field experiments to examine the impact of artificially-pruned shapes (e.g. cubic and spheroidal canopy) on the performance of the spindle tree and the resulting aphid abundance at three sites; on a university campus, at a road green belt, and in a residential area. The results showed aphid abundance was 89.9 times higher in plants with a cubic canopy than with a spheroidal canopy. Plants with a cubic canopy had lower leaf dry mass content and inflorescence numbers, but greater fresh twig length than the plants with a spheroidal canopy. The aphid abundance was negatively correlated with the leaf dry mass content and inflorescence numbers, and positively correlated with the fresh twig length. The results can provide data support for human actives can alter plant performance, and thereby to change insect preference.

scholarly journals 6-Benzylaminopurine Alleviates the Impact of Cu2+ Toxicity on Photosynthetic Performance of Ricinus communis L. Seedlings

2021 ◽  
Vol 22 (24) ◽  
pp. 13349
Author(s):  
Puthukkolli P. Sameena ◽  
Hazem M. Kalaji ◽  
Krystyna Żuk-Gołaszewska ◽  
Tomasz Horaczek ◽  
Edyta Sierka ◽  
...  
Keyword(s):  
Photosynthetic Efficiency ◽  
Ricinus Communis ◽  
Water Status ◽  
Photosynthetic Apparatus ◽  
Essential Element ◽  
Quantum Yields ◽  
Fluorescence Parameters ◽  
Stomatal Responses ◽  
Ricinus Communis L ◽  
The Impact

Copper (Cu) is an essential element involved in various metabolic processes in plants, but at concentrations above the threshold level, it becomes a potential stress factor. The effects of two different cytokinins, kinetin (KIN) and 6-benzylaminopurine (BAP), on chlorophyll a fluorescence parameters, stomatal responses and antioxidation mechanisms in castor (Ricinus communis L.) under Cu2+ toxicity was investigated. Ricinus communis plants were exposed to 80 and 160 μM CuSO4 added to the growth medium. Foliar spraying of 15 μM KIN and BAP was carried out on these seedlings. The application of these cytokinins enhanced the tissue water status, chlorophyll contents, stomatal opening and photosynthetic efficiency in the castor plants subjected to Cu2+ stress. The fluorescence parameters, such as Fm, Fv/Fo, Sm, photochemical and non-photochemical quantum yields, energy absorbed, energy trapped and electron transport per cross-sections, were more efficiently modulated by BAP application than KIN under Cu2+ toxicity. There was also effective alleviation of reactive oxygen species by enzymatic and non-enzymatic antioxidation systems, reducing the membrane lipid peroxidation, which brought about a relative enhancement in the membrane stability index. Of the various treatments, 80 µM CuSO4 + BAP recorded the highest increase in photosynthetic efficiency compared to other cytokinin treatments. Therefore, it can be concluded that BAP could effectively alleviate the detrimental effects of Cu2+toxicity in cotyledonary leaves of R. communis by effectively modulating stomatal responses and antioxidation mechanisms, thereby enhancing the photosynthetic apparatus’ functioning.

Working conditions and occupational pathology of coal miners in the Arctic

2019 ◽  
pp. 452-457 ◽  
Author(s):  
S. A. Gorbanev ◽  
S. A. Syurin ◽  
N. M. Frolova
Keyword(s):  
Coal Mining ◽  
Working Conditions ◽  
Occupational Diseases ◽  
Climatic Factors ◽  
Coal Mines ◽  
The Arctic ◽  
Morbidity Rate ◽  
Coal Miners ◽  
Increased Risk ◽  
The Impact

Introduction. Due to the impact of adverse working conditions and climate, workers in coal-mining enterprises in the Arctic are at increased risk of occupational diseases (OD).The aim of the study was to study the working conditions, causes, structure and prevalence of occupational diseases in miners of coal mines in the Arctic.Materials and methods. Th e data of social and hygienic monitoring “Working conditions and occupational morbidity” of the population of Vorkuta and Chukotka Autonomous District in 2007–2017 are studied.Results. It was established that in 2007–2017 years, 2,296 ODs were diagnosed for the first time in 1851 coal mines, mainly in the drifters, clearing face miners, repairmen and machinists of mining excavating machines. Most often, the ODs occurred when exposed to the severity of labor, fibrogenic aerosols and hand-arm vibration. The development of professional pathology in 98% of cases was due to design flaws of machines and mechanisms, as well as imperfections of workplaces and technological processes. Diseases of the musculoskeletal system (36.2%), respiratory organs (28.9%) and nervous system (22.5%) prevailed in the structure of professional pathology of miners of coal mines. Among the three most common nosological forms of OD were radiculopathy (32.1%), chronic bronchitis (27.7%) and mono-polyneuropathy (15.4%). In 2017, coal miners in the Arctic had a professional morbidity rate of 2.82 times higher than the national rates for coal mining.Conclusions. To preserve the health of miners of coal mining enterprises, technical measures to improve working conditions and medical interventions aimed at increasing the body’s resistance to the effects of harmful production and climatic factors are necessary.

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